Precision Rolling Bearings

Transcription

1 *表紙/編集-決定/E : PM ページ R Pecision Rolling Beaings NTN copoation NTN copoation Pecision Rolling Beaings Pecision Rolling Beaings CAT. No. 22-%/E

2 CONTENTS Technical Data NTN PRECISION ROLLING BEARINGS Main Spindle Beaings Ball Scew Suppot Beaings NTN PRODUCTS APPENDIX

3 . Classification of Pecision Rolling Beaings fo Machine Tools 2 2. Beaing Selection and Shaft & Housing Design. Load Rating and Life. Allowable Speed 2. Beaing Aangements and Stuctues of Beaings fo Main Spindles 22. Handling of Beaings 2. Lubication of Beaings 9. New Technologies 9. Angula Contact Ball Beaings fo Radial Loads. Cylindical Rolle Beaing 2. Angula Contact Ball Beaings fo Axial Loads 2 2. Tapeed Rolle Beaings 2. Ball Scew Suppot Beaings 29. NTN Poducts. Cam followes fo pallet change NTN Rolle followe 29. Magnetic beaing spindle 29. High pecision ai spindle 299. NTN BEAREE FL & FL 299. Appendix

4 Waanty NTN waants, to the oiginal puchase only, that the deliveed poduct which is the subject of this sale (a) will confom to dawings and specifications mutually established in witing as applicable to the contact, and (b) be fee fom defects in mateial o fabication. The duation of this waanty is one yea fom date of delivey. If the buye discoves within this peiod a failue of the poduct to confom to dawings o specifications, o a defect in mateial o fabication, it must pomptly notify NTN in witing. In no event shall such notification be eceived by NTN late than months fom the date of delivey. Within a easonable time afte such notification, NTN will, at its option, (a) coect any failue of the poduct to confom to dawings, specifications o any defect in mateial o wokmanship, with eithe eplacement o epai of the poduct, o (b) efund, in pat o in whole, the puchase pice. Such eplacement and epai, excluding chages fo labo, is at NTN's expense. All waanty sevice will be pefomed at sevice centes designated by NTN. These emedies ae the puchase's exclusive emedies fo beach of waanty. NTN does not waant (a) any poduct, components o pats not manufactued by NTN, (b) defects caused by failue to povide a suitable installation envionment fo the poduct, (c) damage caused by use of the poduct fo puposes othe than those fo which it was designed, (d) damage caused by disastes such as fie, flood, wind, and lightning, (e) damage caused by unauthoized attachments o modification, (f) damage duing shipment, o (g) any othe abuse o misuse by the puchase. THE FOREGOING WARRANTIES ARE IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. In no case shall NTN be liable fo any special, incidental, o consequential damages based upon beach of waanty, beach of contact, negligence, stict tot, o any othe legal theoy,and in no case shall total liability of NTN exceed the puchase pice of the pat upon which such liability is based. Such damages include, but ae not limited to, loss of pofits, loss of savings o evenue, loss of use of the poduct o any associated equipment, cost of capital, cost of any substitute equipment, facilities o sevices, downtime, the claims of thid paties including customes, and injuy to popety. Some states do not allow limits on waanties, o on emedies fo beach in cetain tansactions. In such states, the limits in this paagaph and in paagaph (2) shall apply to the extent allowable unde case law and statutes in such states. Any action fo beach of waanty o any othe legal theoy must be commenced within months following delivey of the goods. Unless modified in a witing signed by both paties, this ageement is undestood to be the complete and exclusive ageement between the paties, supeceding all pio ageements, oal o witten, and all othe communications between the paties elating to the subject matte of this ageement. No employee of NTN o any othe paty is authoized to make any waanty in addition to those made in this ageement. This ageement allocates the isks of poduct failue between NTN and the puchase. This allocation is ecognized by both paties and is eflected in the pice of the goods. The puchase acknowledges that it has ead this ageement, undestands it, and is bound by its tems. NTN Copoation. 22 Although cae has been taken to assue the accuacy of the data compiled in this catalog, NTN does not assume any liability to any company o peson fo eos o omissions.

5 Pecision Rolling Beaings Page TECHNICAL DATA CONTENTS. Classification of Pecision Rolling Beaings fo Machine Tools 2 q Main spindle beaings 2 w Ball scew suppot beaings 2. Beaing Selection and Shaft & Housing Design q Beaing selection w Beaing accuacy e Beaings and igidity Designing beaing and housing. Load Rating and Life2 q Beaing life w Static load ating and allowable axial load2. Allowable Speed 2. Beaing Aangements and Stuctues of Beaings fo Main Spindles 222 q Beaing aangement fo main spindles 22 w Beaing selection based on beaing aangement fo main spindle 2 e Adjustable peload beaing unit 2 Beaing jacket cooling system 2. Handling of Beaings 2 q Cleaning and filling with gease 2 w Mounting 2 e Tightening of inne ing Elastic defomation of space esulting fom tightening foce t Font cove dive-up y Checking axial igidity 2 u Cleaance adjustment fo cylindical olle beaing i Cylindical olle beaing tapeed boe and main spindle tape angle o Running-in opeation fo main spindle beaing. Lubication of Beaings 9 q Gease lubication w Ai-oil lubication e Jet lubication. New Technologies q The new seies of supe-high-speed pecision beaings fo machine tool main spindles "ULTAGE Seies" w New mateial and new suface modification technology e Envionmentally conscious technology

6 Technical Data. Classification of Pecision Rolling Beaings fo Machine Tools Main spindle beaings Table. Types of pecision olling beaings fo machine tools Beaing type Standad Coss section Beaing type Beaing boe mm Contact angle Remaks Page C 2 A beaing type code containing a suffix U means an ULTAGE seies beaing. Optimized 9 (U), S-9 (U), 2, 2 inteio stuctue and esin cage help positively inhibit tempeatue ise (applicable to 9 and (U), S- (U) 2, 2, types with boe diamete of to mm). 9 2C Beaings with pefix S have ceamic balls. Angula contact ball beaing High-speed Standad Eco-fiendly Supe high-speed High-speed Non-contact sealed type Non-contact sealed type 2LA-HSE9 S-2LA-HSE9 2LA-HSE S-2LA-HSE S-2LA-HSF S-2LA-HSL9 S-2LA-HSL S-2LA-HSFL 9 LLB S-9 LLB LLB S- LLB 2LA-BNS9 LLB S-2LA-BNS9 LLB 2LA-BNS LLB S-2LA-BNS LLB, 2, 2 2, 2, 2 2, 2, 2, 2 ULTAGE seies Use of special mateial and intoduction of suface modification contibute to much impoved wea esistance and anti-seizue popety. Optimized specifications fo the inteio stuctue lead to highe speed, igidity and eliability. Beaings with pefix S have ceamic balls. ULTAGE seies Maintaining the advantages of HSE type, this type has small diamete ceamic balls to achieve highe speed and limited heat buildup. Beaings with pefix S have ceamic balls. ULTAGE seies These beaings ae identical to the HSE and HSF types except in that they ae ai-oil lubication designs that have an eco-fiendly nozzle. Featuing lowe noise, educed ai and oil consumption, they positively impove opeating envionments and educe enegy consumption. Beaings with pefix S have ceamic balls. ULTAGE seies Featuing a two-side non-contact seal design and a special gease, these beaings ae a dedicated gease lubicated type that has achieved limited heat buildup though optimization of the inteio stuctue. Beaings with pefix S have ceamic balls. ULTAGE seies Maintaining the advantages of HSE type, this dedicated gease lubicated type has an impoved inteio design (gease esevoi, both -side non-contact seal and special gease) to extend gease life. Beaings with pefix S have ceamic balls. 9 9 BNT9 S-BNT9 BNT S-BNT BNT2 S-BNT2 Angula contact ball beaing seies fo ginding machines/motos. All vaiants ae flush gound. Beaings with pefix S have ceamic balls. 9 2 NN9 (K) 2 NN (K) NNHS (K) NNHST (K) NNHSRT (K) 2 The beaing cleaance can be eithe intechangeable adial cleaance o non-intechangeable adial cleaance. A vaiant (K) is available with a tapeed boe to accommodate a tapeed shaft Double-ow cylindical olle beaing NNU9 (K) 2

7 Technical Data Beaing type Coss section Beaing type Beaing boe mm Contact angle Remaks Page Standad NHS (K) The bounday dimensions of the NHS(K) highspeed single-ow cylindical olle beaing ae the same as those of the N(K). Only the beaing cleaance is non-intechangeable. A ceamic-olle-type (S-N) is available on equest Single-ow cylindical olle beaing High-speed Eco-fiendly NHSR (K) NHSL (K) ULTAGE seies Optimized intenal design allows highe speed and esults in lowe tempeatue ise. The cage is made of a special esin to cope with a high-speed opeation. The allowable maximum speed is highe than that of the conventional high-speed cylindical olle beaing NHS(K). ULTAGE seies This is a dedicated ai-oil lubicated type identical to the NHSR(K) type except in that it incopoates an eco-fiendly nozzle. Still maintaining the high-speed pefomance of the NHSR(K) type, this type boasts lowe noise, educed ai and oil consumption, and positively impoves opeating envionments and educes enegy consumption Plug gage Ring gage Tape gage Plug gage TA Ring gage TB Tape gage fo N-HS(K) single-ow cylindical olle beaing and NN(K) double-ow cylindical olle beaing. 22 SB Cleaance gage fo N-HSK(K), N-HSR(K) single-ow cylindical olle beaing and NN(K), NNHS(K) double-ow cylindicalolle beaing. 2 Cleaance adjustment gauge Adjustable peload beaing unit Adjustable peload beaing unit Fixed position adjustable peload beaing unit. Incopoation of an adjustable peload sleeve and a duplex angula ball beaing allows the use to adjust the peload of an angula ball beaing in a wide ange fom a light peload to a heavy peload. Fixed position peload leads to a geate igidity. Double-diection angula contact thust ball beaing 29 (M) 2 (M) Small-size 2 Lage-size (M) Small-size 22 Lage-size (M) 2 The small beaing is used on a cylinde boe o smalle-diamete side of a tapeed boe of the NNU9, NN9 o NN double-ow cylindical olle beaing; the lage beaing (suffix M) is used on the lage hole side of a tapeed boe. 2 2 Angula contact ball beaing fo axial load HTA9U HTAU S-HTAU , HTA9DB seies beaings ae fully compatible with 29 seies beaings. HTADB seies beaings ae fully compatible with 2 seies beaings Tapeed olle beaings Nominal contact angle of o geate, o smalle Thin-wall type, ISO-compatible metic seies. 2 2

8 Technical Data 2 Ball scew suppot beaings Beaing type Coss section Beaing type Beaing boe mm Contact angle Remaks Page Angula contact thust ball beaing fo ball scews BST 2A-BST Open type BST LXL/L 2A-BST LXL/L Light-contact sealed type ULTAGE seies Suface modification teatment on the beaing ing aceways has led to a longe beaing life and much impoved fetting esistance. Owing to pelubication with a special gease, the sealed type boasts a longe beaing life and simple maintenance wok. All vaiants ae flush-gound and ae povided with a standad peload. 2 2 HT The allowable axial load of this beaing type is geate owing to the impoved inteio design Angula contact ball beaing fo ball scews Needle olle beaings with double-diection thust needle olle beaing Cylindical olle beaings with double-diection thust needle olle beaing AXN ARN 2 2 A cleaance emains between the inne ing of adial beaing and the inne ings of both thust beaings, allowing the use to detemine the peload by, fo example, tightening a nut etc. The tageted peload is attained based on the stating toque. The beaing cleaance on cetain peloaded beaings is contolled in advance so that an intended peload is attained by fully tightening the inne ings on both thust beaing with nuts, o equivalent means

9 Technical Data 2. Beaing Selection and Shaft & Housing Design Beaing selection Geneally, the optimal beaing must be selected to suit the natue of the machine, the aea within the machine, the spindle specification, beaing type, lubication system and dive system of the intended machine though consideations of the design life, pecision, igidity and citical speed, etc. of the beaing. Table 2. summaizes a typical beaing selection pocedue, and Table 2.2 gives an example flowchat accoding to which consideations ae made to select an optimal main spindle beaing fo a machine tool. Table 2. Beaing selection pocedue Step Items being consideed Items being confimed Confim opeating conditions of beaing and conside beaing type. Function and constuction of components to house beaings Beaing mounting location Dimensional limitations Magnitude and diection of beaing load Magnitude of vibation and shock load Shaft speed Beaing aangement (fixed side, floating side) Noise and toque of the beaing Beaing opeating tempeatue ange Beaing igidity Installation / disassembly equiements Maintenance and inspection Cost-effectiveness Allowable misalignment of inne/oute ings Detemine beaing type and aangement. Select beaing dimensions. Design life of components to house beaings Dynamic/static equivalent load conditions Safety facto So Allowable speed Allowable axial load Detemine beaing dimensions. Select beaing toleances. Shaft unout toleances Toque fluctuation High-speed opeation Decide beaing gade. Select beaing intenal cleaance. Mateial and shape of shaft and housing Fit Tempeatue diffeence between inne and oute ings Allowable misalignment of inne/oute ings Magnitude and natue of load Amount of peload Decide beaing intenal cleaance. Select cage. Rotational speed Noise level Vibation and shock load Lubication Cage type Select lubication method. Opeating tempeatue Rotational speed Lubication method Sealing method Maintenance and inspection Decide lubication method, lubicant, and sealing method. Conside special specifications. Opeating conditions (special envionments: high o low tempeatue, chemical) Requiement fo high eliability Decide special beaing specifications. Select installation and disassembly pocedues. Mounting dimensions Installation and disassembly pocedues Decide installation and disassembly pocedues.

10 Technical Data Table 2.2 Beaing selection pocedue Use s equiements Max. speed Main spindle size Lubication system Beaing size. Consideation of allowable dmn value. Consideation of fit. Consideation of tightening foce fo inne ing space. Consideation of dive-up of font cove. Estimation of beaing intenal peload at maximum speed and consideation of beaing initial cleaance accoding to NTN s beaing selection guideline. Finalization of beaing specifications. NG Consideation of igidity of beaing and main spindle. Consideation of beaing life. OK Finalization of main spindle specifications The aticles necessay fo basic consideations in selecting an optimal main spindle beaing fo machine tool ae summaized in Table 2.. Table 2. Selection pocedue fo beaings fo main spindles of machine tools () Type of Machine (2) Main spindle oientation () Diamete and size of main spindle NC Lathe, machining cente, ginding machine, etc. Vetical, hoizontal, vaiable-diection, inclined, etc. #, #, #, etc. F d d2 d d Beaing type/beaing numbe Rota (Weight m) F Pulley d () Shape and mounting-elated dimensions of main spindle Fa Fm Main spindle inne diamete d- Main spindle oute diamete d Main spindle inne diamete d- Main spindle oute diamete d Fig. 2. Main spindle shape and mounting-elated dimensions (example) () Intended beaing type, beaing size, and peloading method () Slide system fee side () Lubication method () Dive system Pesence/absence of jacket cooling (9) aangement on beaing aea () Jacket cooling conditions Font (angula contact type, cylindical olle type) o ea (angula contact type, cylindical olle type) peloading system (fixed-position peloading, fixed-pessue peloading) Cylindical olle beaing, ball bushing (availability of cooling) Gease, ai-oil, oil mist (MiconLub) Built-in moto, belt dive, coupling Yes/No Synchonization with oom tempeatue, machine-to-machine synchonization, oil feed ate (L/min) Max. speed (min - ) () Opeating speed ange Nomal speed ange (min - ) Opeating speed ange (min - ) Load cente Applied load Radial load F (N) Axial load Fa (N) (2) Load conditions (machining conditions) Speed Machining fequency Intended beaing life

11 Technical Data 2 Beaing accuacy Beaing accuacy Accuacies of olling beaings, that is, dimensional accuacy and unning accuacy of olling beaings ae defined by applicable ISO standads and JIS B standad (Rolling beaings - Toleances) (Tables 2. and 2.). The dimensional accuacy govens the toleances that must be satisfied when mounting a beaing to a shaft o housing, while the unning accuacy defines a pemissible un-out occuing when otating a beaing by one evolution. Methods fo measuing the accuacy of olling beaings (optional methods) ae descibed in JIS B (Measuing methods fo olling beaings). Table 2. summaizes some typical methods fo measuing unning accuacy of olling beaings. Table 2. Beaing types and applicable toleance Beaing type Applicable standad Toleance class Angula contact ball beaings Cylindical olle beaigns Needle olle beaings JIS B ISO92 Class Class Class Class class class Class Class Class Class Class Class Class 2 Class 2 Tapeed olle beaings Metic Inch J seies JIS B ANSI/ABMA Std.9 ANSI/ABMA Std.9. Class,X Class Class K class Class 2 Class N Class Class Class C Class Class Class B Class Class A Double ow angula contact thust ball beaings NTN standad Class Class Table 2.. Compaison of toleance classifications of national standads Standad Japanese industial standad (JIS) Intenational Oganization fo Standadization (ISO) Deutsches Institut fu Nomung(DIN) Ameican National Standads Institute (ANSI) Ameican Beaing Manufactue's Association (ABMA) Applicable standed JIS B ISO 92 ISO 99 ISO ISO 22 DIN 2 ANSI/ABMA Std.2 ANSI/ABMA Std.9. ANSI/ABMA Std.9 Toleance Class Class,X Class Class Class Class 2 Nomal class Class X Class Class Class Class 2 Nomal Class Class Class Class Class Class Class Class Class A Class A P P P P P2 ABEC- RBEC- Class K Class ABEC- RBEC- Class N Class 2 ABEC- RBEC- ABEC- ABEC-9 Class C Class B Class A Class Class Class "ABEC" is applied fo ball beaings and "RBEC" fo olle beaings. Notes : JIS B, ISO 92 and 99, and DIN 2 have the same specification level. 2: The toleance and allowance of JIS B ae slightly diffeent fom those of ABMA standads. All type Radial beaings Thust ball beaings Beaing Types Tapeed olle beaings (Inch seies) Pecision instument beaings All type Radial beaings (Except tapeed olle beaings) Tapeed olle beaings (Metic seies) Tapeed olle beaings (Inch seies)

12 Technical Data To attain a highe level of unning accuacy equied of a main spindle of machine tool, a high-pecision beaing that satisfies the use's main spindle specifications must be chosen. Usually, a highpecision beaing pe JIS accuacy class, o 2 is selected accoding to an intended application. In paticula, the adial un-out, axial un-out and nonepetitive un-out of a main spindle beaing geatly affect the unning accuacy of the main spindle and theefoe have to be stictly contolled. With the ecent supe high-pecision machine tools, the contol of N.R.R.O. (Non-Repetitive Run-Out) has inceasing impotance, and the main spindle on a tuning machine o machining cente incopoates an N.R.R.O. accuacy contolled beaing. Fo futhe infomation about N.R.R.O., efe to the following section. Note that to attain a highe accuacy with a main spindle, caeful consideations need to be execised fo the accuacies (ciculaity, cylindicity, coaxiality) of machine components othe than a beaing (shaft, housing) as well as machining method and finish accuacy of the shaft and housing. Fo the infomation about the accuacies of shaft and housing, efe to a section given late. Table 2. Measuing methods fo unning accuacies Chaacteistic toleance Measuement method Inne ing adial unout (Kia) Measuing load Measuing load Radial unout of the inne ing is the diffeence between the maximum and minimum eading of the measuing device when the inne ing is tuned one evolution. Oute ing adial unout (Kea) Measuing load Measuing load Radial unout of the oute ing is the diffeence between the maximum and minimum eading of the measuing device when the oute ing is tuned one evolution. Inne ing axial unout (Sia) Measuing load Measuing load Axial unout of the inne ing is the diffeence between the maximum and minimum eading of the measuing device when the inne ing is tuned one evolution. Oute ing axial unout (Sea) Measuing load Measuing load Axial unout of the oute ing is the diffeence between the maximum and minimum eading of the measuing device when the oute ing is tuned one evolution. Inne ing side unout with boe (Sd) Inne ing side unout with boe is the diffeence between the maximum and minimum eading of the measuing device when the inne ing is tuned one evolution togethe with the tapeed mandel. Oute ing outside suface inclination (SD).2s max.2s max Reinfocing plate Oute ing outside suface inclination is the diffeence between the maximum and minimum eading of the measuing device when the outside ing is tuned one evolution along the einfocing plate.

13 Technical Data N.R.R.O. (Non-Repetitive Run-Out) of beaing Accuacies of olling beaings ae defined by applicable ISO standads and a JIS (Japanese Industial Standad) standad, wheein the accuacies ae discussed unde the desciptions of adial un-out (Kia), axial un-out (Sia), etc. Accoding to the methods fo measuing unning accuacies in Table 2., un-out is ead by tuning a beaing by only one evolution (each eading is synchonized with the evolution of the beaing being analyzed). In fact, howeve, a olling beaing fo machine tool is used in a continuous evolving motion that involves moe than one evolution. As a esult, the actual un-out accuacy with a olling beaing includes elements that ae not synchonous with the evolution of the beaing (fo example, a diffeence in diamete among olling elements involved, as well as oundness on the aceway sufaces of inne ing and oute ing), causing the tajectoy of plotting with unning accuacies to vay with each evolution. The un-out of an element not in synchonization with the evolutions of beaing is known as N.R.R.O. (Non- Repetitive Run-Out) and is equivalent to the amplitude in the Lissajous figue illustated in Fig. 2.. The effect of N.R.R.O. on a olling beaing onto the accuacies is illustated in Fig. 2. by taking a main spindle of tuning machine as an example. This diagam illustates a machining pocess whee the outside suface of a wok piece mounted to the main spindle is shaved by a tuning opeation. If the outside suface is cut with a new tajectoy with evey evolution, the outside shape of wok piece will be distoted. Futhemoe, if the accuacies of shaft and housing ae not high enough o beaings ae assembled onto the shaft and/o housing impopely, the beaing ing can be defomed, possibly leading to a un-out that is not in synchonization with the evolutions of beaing. st evolution 2nd evolution d evolution Revolution-synchonized vibation only Fig. 2.2 Non-evolution-synchonized vibation only Cutting tool Distotion of wok piece shape Fig. 2. Model of cutting opeation Non-epetitive un-out Fig. 2. Lissajous figue 9

14 Technical Data Accuacies of shaft and housing Depending on the fit of a beaing to a shaft and a housing, the beaing intenal cleaance can vay. Fo this eason, an adequate beaing fit has to be attained so that the beaing can pefom as designed. (Refe to the ecommended fit section.) Also, the axial tightening toque on a beaing needs to be consideed. To avoid defomation of beaing aceway suface owing to axial tightening of the beaing, it is necessay to caefully detemine the dimensions of components associated with a tightening foce the magnitude of tightening foce and the numbe of tightening bolts. The cleaance on a tapeed boe cylindical olle beaing is adjusted by changing the dive-up to the tape. Because of this, the citical factos associated with an appopiate fit of a beaing to a shaft and/o a housing ae the dimensional accuacies of the tape, contact suface on the tape, and the squaeness of the end face of the inne ing elative to the shaft centeline duing the dive-up pocess. Typical accuacy values fo a spindle and housing ae summaized in Tables 2. and 2.. Typical accuacy fo spindle Typical accuacy fo housing Table 2. Fom accuacy of housing t t t AB AB A Da AB 2 A Fundamental pemissible toleance IT Accuacy Symbol Toleance P P P2 Deviation fom cicula fom Angulaity Run out t t t IT 2 IT 2 IT B Db IT2 2 IT2 2 IT t t t t AB IT 2 IT 2 IT2 Table 2. Fom accuacy of spindle A da t t t AB B AB t2 AB t db t 2 A Eccent icity t The fom toleance, symbol and efeence face of the housing ae in accodance with ISO R. 2 The length of the beaing fit suface is often too small to measue concenticity. Theefoe, this citeion applies only when the fit suface has a width sufficient as a efeence face. Housing boe diametes Da and Db ae the efeence dimensions used when the toleance fo pemissible fom accuacy ae detemined. Fo example, when a JIS class beaing is used fo a housing with a mm inside boe, the toleance of oundness is t = IT/2 = /2 = 2.m. IT IT IT Accuacy Deviation fom cicula fom Angulaity Run out Eccent icity Symbol Toleance Fundamental pemissible toleance IT P P P2 t t t2 t t The fom toleance, symbol, and efeence face of spindle ae in accodance with ISO R. 2 The length of the beaing fit suface is often too small to measue concenticity. Theefoe, this citeion applies only when the fit suface has a width sufficient as a efeence face. When detemining a toleance fo pemissible fom accuacy, the efeence dimensions used ae shaft diametes da and db. Fo example, when using a JIS class beaing fo a dia. mm shaft, the toleance of oundness is t = IT/2 = /2=2 m. IT is pefeed if the diamete toleance of the beaing fit suface is IT. IT 2 IT 2 IT IT IT2 2 IT2 2 IT 2 IT IT IT 2 IT 2 IT2 2 IT2 IT Fundamental toleance IT Table 2.9 Fundamental toleance IT Classification of nominal dimension mm ove 2 2 incl. 2 2 Fundamental toleance IT value m IT IT IT2 IT IT

15 Technical Data Beaings and igidity The igidity of the main spindle of a machine tool is associated with both beaing igidity and shaft igidity. Beaing igidity is typically govened by the elastic defomation between the olling elements and aceway suface unde load. Usually, beaings ae peloaded in ode to incease the igidity. Unde same loading conditions, a olle beaing has a highe igidity than a ball beaing of the same size. Howeve, having sliding potions, a olle beaing is disadvantageous in suppoting a high-speed shaft. Shaft igidity is geate with a lage shaft diamete. Howeve, the suppoting beaing must have a sufficient size and its dmn value (pitch cente diamete acoss olling elements dm [mm] multiplied by speed [min - ]) must be accodingly geate. Of couse, a lage beaing is disadvantageous fo high-speed applications. To sum up, the igidity equied of the shaft aangement must be consideed befoe the beaing igidity (beaing type and peload) and shaft igidity ae detemined. Beaings igidity The igidity of a beaing built into a spindle diectly affects the igidity of the spindle. In paticula, a high degee of igidity is equied of the main spindle of a machine tool to ensue adequate poductivity and accuate finish of wokpieces. Beaing igidity is govened by factos such as the following: () Types of olling elements (2) Size and quantity of olling elements () Mateial of olling elements () Beaing contact angle () Peload on beaing Type of olling elements (olle o ball) The suface contact patten of the olling element and aceway is line contact with a olle beaing, while a ball beaing is point contact. As a esult, the dynamic defomation of a beaing elative to a given load is smalle with a olle beaing. Size and numbe of olling elements The size and numbe of olling elements of a beaing ae detemined based on the tageted pefomance of the beaing. Lage olling elements lead to a geate beaing igidity. Howeve, a beaing having lage olling elements tends to be affected by gyatoy sliding centifugal foce, and, as a esult, its high-speed pefomance will be degaded. Incidentally, a geate numbe of olling elements helps incease beaing igidity, but at the same time ceates an inceased numbe of heat geneation souces, possibly leading to geate tempeatue ise. Fo this eason, smalle size of olling elements ae used fo high-speed applications. To achieve both "high speed" and "high igidity", each type of the NTN angula contact ball beaing fo a machine tool is manufactued accoding to optimized specifications fo inteio stuctue. Axial displacement (m) Axial displacement (m) 2LA-HSE2C 2UC Axial load (N) Fig. 2. Mateial of olling element (ceamic and steel) Cetain NTN beaings incopoate ceamic olling elements. As Young's modulus of silicon nitide ( GPa) is geate than that of beaing steel (2 GPa), the igidity with this type of beaing is accodingly geate. Axial displacement (m) Beaing steel ball Ceamic ball Axial load (N) Fig. 2. Beaing contact angle A smalle contact angle on an angula contact ball beaing esults in geate adial igidity. When used as a thust beaing, this type of beaing should have a geate contact angle to enable geate axial igidity. 2LA-HSE2CDB/GL= 2LA-HSE2DB/GL=2 2LA-HSE2ADDB/GL=2 Axial load (N) Fig. 2.

16 Technical Data Peload on beaing A geate peload on a given beaing esults in geate igidity (Fig. 2.). Howeve, too geat of a peload on a beaing can lead to oveheating, seizue, and/o pematue wea of the beaing. It is possible to use beaings in thee- o fou-ow configuations in ode to achieve inceased axial igidity (Fig. 2.9). Axial displacement (m) GL, afte peloading GN, afte peloading GM, afte peloading Axial load (N) Fig. 2. Peloading technique and peload Beaing peloading techniques can be categoized as definite position peloading and constant pessue peloading (Fig. 2.). Definite position peloading is useful in enhancing the igidity of a beaing unit, as the positional elationship acoss individual beaings can be maintained. On the othe hand, as peloading is achieved with sping foce, the constant pessue peloading technique can maintain a peload constant even when the beaing-to-beaing distance vaies due to heat geneation on the spindle o a change in load. The basic peload fo a duplex beaing is given in the elevant section fo each beaing. If an angula contact ball beaing is to be used fo a high-speed application, such as fo the main spindle of a machine tool, detemine the optimal peload by consideing the incease in contact suface pessue between olling elements and the aceway suface that esults fom gyatoy sliding and centifugal foce. When consideing such an application, consult NTN Engineeing. Definite position peloading Axial displacement (m) 2LA-HSE2CDB/GL 2LA-HSE2CDBT/GL 2LA-HSE2CDTBT/GL Axial load (N) Fig. 2.9 Constant pessue peloading Fig. 2. Peload and igidity The effect of peloading fo an incease in beaing igidity is summaized in Fig. 2.. When the inne ings in the diagam ae tightened to bing them togethe, beaings!and!ae each axially displaced by dimensiono, theeby attaining a peload Fo. In this situation, if an axial load Fa is futhe exeted fom outside, the displacement on beaing!inceases bya, while the displacement on beaing!deceases. At this point, the loads on beaings!and!ae F!and F!, espectively. When compaed with b (the displacement occuing when an axial load Fa is exeted onto a non-peloaded beaing!), displacementa is small. Thus, a peloaded beaing has highe igidity. Fo Beaing@ Beaing! δo δo Fa Fo () Fee fom peloading (2) Unde peloading Fo () Unde peloading with axial load applied δo δa F2 δo Oute ing Ball Inne ing δo δa Inne ing axial δo displacement Fo : peload Inne ing axial δa displacement F=F2Fa Beaing@ Axial load δb Fo δ δo δa δo Fa δ2 Beaing! Fa F2 F Axial displacement Fig. 2. Peload gaph 2

17 Technical Data Gyatoy sliding Evey olling element M (ball) in an angula contact A ball beaing evolves on the axis of otation A-A' as illustated in Fig A evolving object tends to A' M foce the axis of otation to a vetical o hoizontal attitude. As a esult, the Fig. 2.2 Gyatoy sliding olling element develops a foce to alte the oientation of the axis of otation. This foce is known as a gyatoy moment (M). When the foce due to the gyatoy moment is geate than the esistance foce olling element load multiplied by the coefficient of fiction between the aceway and olling element, gyatoy sliding occus on the aceway suface. This leads to heat geneation, wea and seizue. Theefoe, it is necessay to povide a sufficient esistance foce to inhibit gyatoy sliding. NTNs ecommended peload is based on this theoy. The gyatoy moment that will occu can be calculated by the fomula below. Mkbcsin 2 k mdw.dw M dw n 2 sin M Gyatoy moment bautootation angula velocity of olling element cangula velocity of evolution m Mass of olling element Density of olling element dw Diamete of olling element Angle of axis of otation of olling element n Speed of inne ing Spin sliding Evey olling element (ball) in an angula contact ball beaing develops spin sliding that is unavoidable owing to the stuctue of the beaing, elative to the aceway suface of eithe the inne ing o oute ing (Fig. 2.). Usually, at a lowe speed Fig. 2. Spin sliding ange, pue olling motion occus between an inne ing aceway and olling elements and spin sliding develops between an oute ing aceway and olling elements (this state is known as inne ing contol). At a highe speed ange, pue olling motion occus between an oute ing aceway and olling elements and spin sliding develops between an inne ing aceway and olling elements (this state is known as oute ing contol). A point whee tansfe fom inne ing contol to oute ing contol occus is known as contol tansfe point. An amount of spin sliding and contol tansfe point can vay depending on the beaing type and beaing data. Geneally, the amount of spin sliding will be geate with an oute ing contol state. Accoding to J. H. Rumbage and J. D. Dunfee, when the amount of spin sliding exceeds.2 (N/m m 2 -mm/s), incease of heat geneation and wea stat. Geneally, it is necessay fo a beaing of a highspeed main spindle to have a peload that can pevent spin sliding. The example of wea on a beaing owing to spin sliding is given in Fig. 2.. The magnitude of spin-deived wea is govened by a PV value (amount of spin sliding) duing opeation of the main spindle. Theefoe, the optimum beaing fo main spindle must be selected. Though the possibility of spin-deived wea occuence vaies depending on the beaing type, model numbe and specifications, we caefully detemined a contol tansfe point in an opeating aangement fo NTN angula contact ball beaings fo main spindles of machine tools. Thus, we believe that the amount of spin sliding with this beaing categoy is not vey lage. Additionally, the magnitude of spin-deived wea is significantly affected by how well the aceway suface is lubicated. Regadless of the type of sliding, even mino sliding can lead to wea if oil film is not fomed well. Fo this eason, a eliable lubication aangement needs to be incopoated. The fom of wea on the beaing aceway deived fom spin sliding appeas as. The wea on the aceway suface on inne ing that esulted fom spin sliding is given below. 2.m Possible causes fo Rolling contact aea () Contact ellipse and diection of spin sliding () Beaing pessue within ellipse (P) () Wea on aceway suface Beaing: 2T Thust load: 2 kn Speed: min - Lubication: Gease Run time: h type wea (2) Sliding velocity (V) () PV value owing to spin PVmax 2. Mechanism of wea on beaing owing to spin sliding

18 Technical Data Designing shaft and housing In designing a beaing and housing, it is vey impotant to povide a sufficient shoulde height fo the beaing and housing so as to maintain beaing and housing accuacies and to avoid intefeence with the beaing elated cone adius. The chamfe dimensions ae shown in Table 2. and the ecommended shoulde height and cone adii on the shaft and housing ae listed in Table 2.. Table 2. Allowable citical-value of beaing chamfe () Radial beaings (Except tapeed olle beaings) (2) Metic tapeed olle beaings Unit mm s min o s min Nominal boe diamete d ove incl s maxos max Radial diection Axial diection These ae the allowable minimum dimensions of the chamfe dimension "" o "" and ae descibed in the dimensional table. s min 2 o s min Nominal boe diamete of beaing "d" o nominal outside diamete "D" ove Beaing cone adius dimensions incl Boe diamete face of beaing o oute diamete face of beaing s max os max Radial diection s min o s min s min o s min s max o s max (Axial diection) Fig. 2. Unit mm Axial diection These ae the allowable minimum dimensions of the chamfe dimension "" o "" and ae descibed in the dimensional table. Inne ings shall be in accodance with the division of "d" and oute ings with that of "D". Note: This standad will be applied to beaings whose dimensional seies (efe to the dimensional table) ae specified in the standad of ISO o JIS B 2. Fo futhe infomation concening beaings outside of these standads o tapeed olle beaings using US customay units, please contact NTN Engineeing. Side face of inne ing o cente washe, o side face of oute ing s min o s min () Thust beaings Unit mm s max o s max s min o min (Radial diection) s max os max Radial and axial diecition These ae the allowable minimum dimensions of the chamfe dimension "" o "" and ae descibed in the dimensional table.

19 Technical Data Abutment height and fillet adius The shaft and housing abutment height (h) should be lage than the beaing's maximum allowable chamfe dimensions (s max), and the abutment should be designed so that it diectly contacts the flat pat of the beaing end face. The fillet adius (a) must be smalle than the beaing's minimum allowable chamfe dimension (s min) so that it does not intefee with beaing seating. Table 2. lists abutment height (h) and fillet adius (a). Fo beaings that suppot vey lage axial loads, shaft abutments (h) should be highe than the values in the table. Whee a fillet adius (a max) lage than the beaing chamfe dimension is equied to stengthen the shaft o to elieve stess concentation (Fig. 2.a), o whee the shaft abutment height is too low to affod adequate contact suface with the beaing (Fig. 2.b), spaces may be used effectively. Relief dimensions fo gound shaft and housing fitting sufaces ae given in Table 2.2. h h Fig. 2. Beaing mounting with space Table 2. Fillet adius and abutment height Unit mm h (min) Nomal use If beaing suppots lage axial load, the height of the shoulde must exceed the value given hee. 2.2 Relief dimensions fo gounding t t Relief dimensions b t b b Note: as max maximum allowable fillet adius.

20 Technical Data. Load Rating and Life Beaing life Even in beaings opeating unde nomal conditions, the sufaces of the aceway and olling elements ae constantly being subjected to epeated compessive stesses which causes flaking of these sufaces to occu. This flaking is due to mateial fatigue and will eventually cause the beaings to fail. The effective life of a beaing is usually defined in tems of the total numbe of evolutions a beaing can undego befoe flaking of eithe the aceway suface o the olling element sufaces occus. Othe causes of beaing failue ae often attibuted to poblems such as seizue, abasions, cacking, chipping, scuffing, ust, etc. Howeve, these so called "causes" of beaing failue ae usually caused by impope installation, insufficient o impope lubication, faulty sealing o impope beaing selection. Since the above mentioned "causes" of beaing failue can be avoided by taking the pope pecautions, and ae not simply caused by mateial fatigue, they ae consideed sepaately fom the flaking aspect. Usually, the load exeted on the main spindle of a machine tool is elatively small compaed to the dynamic ated load on the beaing. Theefoe, the fatigue life of a beaing seldom poses a poblem. The following opeating conditions, athe than a beaing's ating life, can significantly affect the beaing functions (unning accuacy, igidity, heat geneation, etc.) and equie special consideation. () High speed opeation. (2) Heavy peload. () Lage bending of the shaft. () Lage tempeatue diffeence between the inne and oute ings. Fo futhe infomation, please consult NTN Engineeing. Basic ating life and basic dynamic load ating A goup of seemingly identical beaings when subjected to identical load and opeating conditions will exhibit a wide divesity in thei duability. This "life" dispaity can be accounted fo by the diffeence in the fatigue of the beaing mateial itself. This dispaity is consideed statistically when calculating beaing life, and the basic ating life is defined as follows. The basic ating life is based on a 9% statistical model which is expessed as the total numbe of evolutions 9% of the beaings in an identical goup of beaings subjected to identical opeating conditions will attain o supass befoe flaking due to mateial fatigue occus. Fo beaings opeating at fixed constant speeds, the basic ating life (9% eliability) is expessed in the total numbe of hous of opeation. Basic dynamic load ating expesses a olling beaing's capacity to suppot a dynamic load. The basic dynamic load ating is the load unde which the basic ating life of the beaing is million evolutions. This is expessed as pue adial load fo adial beaings and pue axial load fo thust beaings. These ae efeed to as "basic dynamic load ating (C)" and "basic dynamic axial load ating (Ca)." The basic dynamic load atings given in the beaing tables of this catalog ae fo beaings constucted of NTN standad beaing mateials, using standad manufactuing techniques. The elationship between the basic ating life, the basic dynamic load ating and the beaing load is given in the fomula below. Fo ball beaings: L C. P Lh C.2 n P Fo olle beaings: L C /. P Lh C /. n P whee, L : Basic ating life, evolutions Lh : Basic ating life, h C : Basic dynamic load ating, N {kgf} (C: adial beaings, Ca: thust beaings) P : Equivalent dynamic load, N {kgf} (P: adial beaings, Pa: thust beaings) n : Rotational speed, min - When seveal beaings ae incopoated in machines o equipment as complete units, all the beaings in the unit ae consideed as a whole when computing beaing life (see fomula.). L. /e L e L 2 e whee, L : Total basic ating life of entie unit, h L L2 Ln: Basic ating life of individual beaings,, 2, n, h e = /9...Fo ball beaings e = 9/...Fo olle beaings When the load conditions vay at egula intevals, the life can be given by fomula (.). L n e Lm 2 j -. L L2 L j

21 Technical Data whee, L m : Total life of beaing j : Fequency of individual load conditions ( j = ) L j : Life unde individual conditions Adjusted ating life The basic beaing ating life (9% eliability facto) can be calculated by the fomula (.2) mentioned. Howeve, in some applications a beaing life facto of ove 9% eliability may be equied. To meet these equiements, beaing life can be lengthened by the use of specially impoved beaing mateials o manufactuing pocess. Beaing life is also sometimes affected by opeating conditions such as lubication, tempeatue and otational speed. Basic ating life adjusted to compensate fo this is called "adjusted ating life," and is detemined by using the fomula (.). Lna aa2al. whee, Lna : Adjusted ating life in millions of evolutions ( ) a : Reliability facto a2 : Beaing chaacteistics facto a : Opeating conditions facto Life adjustment facto fo eliability a The value of eliability facto a is povided in Table. fo eliability of 9% o geate. Table. Reliability facto a Reliability % L L L L L L L Reliability facto a Life adjustment facto fo mateial a2 Beaing chaacteistics concening life vay accoding to beaing mateial, quality of mateial and use of special manufactuing pocesses. In this case, life is adjusted by the beaing chaacteistics facto a2. The basic dynamic load atings listed in the catalog ae based on NTN's standad mateial and pocess, theefoe, the adjustment facto a2. a2 may be used fo specially enhanced mateials and manufactuing methods. If this applies, consult NTN Engineeing. Life adjustment facto fo opeating conditions a Opeating conditions facto a is used to compensate fo when the lubication condition wosens due to ise in tempeatue o otational speed, lubicant deteioates, o becomes contaminated with foeign mattes. Geneally speaking, when lubicating conditions ae satisfactoy, the a facto has a value of one. And when lubicating conditions ae exceptionally favoable and all othe opeating conditions ae nomal, a can have a value geate than one. a is howeve less than in the following cases: Dynamic viscosity of lubicating oil is too low fo beaing opeating tempeatue ( mm 2 /s o less fo ball beaings, 2 mm 2 /s fo olle beaings) Rotational speed is paticulaly low (If multiplication of otational speed n min - and olling element pitch diamete Dpw mm is Dpwn,) Beaing opeating tempeatue is too high Lubicant is contaminated with foeign matte o moistue

22 Technical Data New beaing life fomula By damatic impovement in beaing mateials and beaing manufactuing techniques, beaings can offe a life seveal times as long as that calculated fom the fomula (.) as long as they ae mounted with minimal mounting eos ae fully fee fom foeign matte and adequately lubicated. This finding was obtained by a seies of expeiments pefomed by NTN. NTNs new beaing life calculation theoy is based on a fatigue limit theoy accoding to which unde clean and efficient lubication conditions, beaing life can be indefinite at a paticula contact suface pessue. Fo this pupose, NTN pefoms calculations based on the contact suface pessue at a fatigue limit of. GPa that is defined in ISO2: 99/Amd2: 2. Incidentally, if foeign matte entes into a beaing, depending on the size and amount of foeign matte, the actual life of that beaing can be much shote than the ating life that is calculated by fomula (.). Also, poo lubicating conditions can cause the actual beaing life to be shote than the ating life. NTNs new beaing life calculation is designed to detemine a new life coection facto a NTN by the following fomula. C p Lnmaa NTN. P Beaing life theoy () Conventional Lundbeg-Palmgen (L-P) theoy Accoding to this theoy, a stess that govens olling fatigue is consideed, that is, a maximum dynamic shea stess o that is exeted, at a depth of Zo fom the olling contact suface, in a plane paallel with the olling contact suface. Refeing to a theoy of Neube, et. al. which claims that the duability of a mateial deteioates as the volume being subjected to a stess application deceases, the L-P theoy assumes that a fissue occuing at a weak point of mateial at aound the depth Zo eaches the suface and leads to develop flaking. The pobability of suvival S of a volume V that is subjected to N times of stess application is detemined by the fomula below accoding to the Weibull theoy. N e c V Rn.9 S z h whee, S Pobability of suvival of stess volume V N Numbe of epeated stess applications e Weibull slope (index to epesent vaiation in life) o Maximum shea stess Zo Depth fom suface at which maximum shea stess occus chindexes Fom the basic fomula fo the beaing life elative to olling fatigue (.9), a geneic life fomula below is obtained: C P p L. whee, LBasic ating life C Basic dynamic load ating P Dynamic equivalent load p ch2e (point contact) ch2e (line contact) Z 2a Fig.. Stess volume esulting fom olling contact accoding to L-P theoy (2) NTNs new beaing life theoy While the L-P theoy intends to define intenally occuing flaking owing to the shea stess within a mateial that esults fom hetzian contact, NTN's new beaing life theoy is designed not only to evaluate suface-initiated flaking but also to detemine life of each small segment (L) based on a local stess (). This is done by dividing an aea fom the inteio to the contact suface of the mateial into small segments as illustated in Fig..2, and finally obtaining the oveall beaing life L by the fomula (.). N e i c ivi Rn. S i z h i LiNi c i V i z h i /e.2 n -/e L Li -e. i= whee, Sipobability of suvival of stess volumevi of divided segment L Oveall beaing life Zi Depth of divided small stess volumevi fom the suface n Numbe of segments u Fatigue limit stess A stess below which a beaing does not develop failue (flaking) unde ideal lubication conditions. ISO 2: 99/Amd2: 2 specifies. GPa as a the maximum contact suface pessue at a fatigue limit. NTN uses it as a Von Misses stess equivalent to the maximum contact suface pessue. GPa. When i is smalle than u (fatigue limit), the life of a egion in question (L) will be infinitely long.

23 Technical Data NTNs new beaing life fomula The coelation between the NTNs life coection facto a NTN and coected ating life Lnm is defined by the fomula (.) below. C p Lnmaa NTN. P whee, Z Pmax Fig..2 Calculation model Lnm Coected ating life a Reliability coefficient a NTN Life coection facto that eflects mateial popeties, fatigue limit stess, contamination with foeign matte and oil film paamete () (. a NTN ) C Basic dynamic load ating P Dynamic equivalent load p Index (ball beaing) / (olle beaing) () Effect of fatigue limit NTNs new beaing life fomula intoduces a concept of fatigue life accoding to which the beaing life is infinitely long at a paticula contact suface pessue as illustated in Fig.. assuming no foeign matte is tapped in the beaing and the beaing is eliably lubicated. y (2) Effect of foeign matte The effect of foeign matte is teated as sufaceinitiated flaking that stats fom a dent esulting fom tapped foeign matte. NTN pefoms a beaing life calculation, assuming that the size of foeign matte and the stess concentation aea in the middle potion (the size of this aea coesponds with that of the foeign matte) in the suface laye as well as the amount of foeign matte significantly affect the beaing life. Dented aceway Nomal aceway Fig.. Contact suface pessue distibution esulting fom dent () Effect of oil film paamete () The oil film paamete can be used to calculate beaing life. The oil film paamete, designated by, is the atio of the oil film thickness to the oughness of the suface. It can be used to calculate the aveage stess acoss the suface laye of two contacting sufaces, such as a olling element and aceway. Fom this suface laye stess, the contact suface pessue can be detemined. Beaing life is then calculated fom the contact suface pessue. Conditions of two objects on suface laye Calculation model Object having composite oughness of two objects Smooth suface Contact suface pessue equivalent to fatigue limit Contact stess Rating life Life eflecting fatigue limit Life Fig.. Basic concept of fatigue limit Oil film Fig.. Model of stess load onto the suface laye New life calculation fomula chat Vaious statuses of contamination with foeign matte ae defined in Table.2. The values of ISO codes and NAS classes ae those fo ball beaings that ae subjected to moe sevee opeating conditions. Table.2 Status of contamination Condition of contamination Extemely clean Clean Nomal Lightly Modeately Highly Seveely contaminated contaminated contaminated contaminated Contamination coefficient Guideline fo application ISO cleanliness code (ISO ) NAS class Filteed Less than μm m m m m μm o moe No filte Ingess of much dust / /2 / 9/ 2/ 2/2 2/

24 Technical Data () Effect of foeign matte on coelation between load (P/C) and life coection facto a NTN antn antn antn Nomal Lightly contaminated Modeately contaminated.9 Highly contaminated. Seveely contaminated Extemely clean Clean Nomal Highly contaminated. Seveely contaminated Extemely clean Clean. P/C Fig.. Coelation between P/C and antn (effect of foeign matte in ball beaing).. P/C Fig.. Coelation between P/C and antn (effect of foeign matte in olle beaing)... = =. =. =. =2 =... P/C antn Lightly contaminated Modeately contaminated (2) Effect of oil film paamete () on coelation between load (P/C) and life coection facto a NTN Fig.. Coelation between P/C and antn (effect ofwith ball beaing) = =2 =. =. =.. =.. 2 Static load ating and allowable axial load Basic static load ating When stationay olling beaings ae subjected to static loads, they suffe fom patial pemanent defomation of the contact sufaces at the contact point between the olling elements and the aceway. The amount of defomity inceases as the load inceases, and if this incease in load exceeds cetain limits, the subsequent smooth opeation of the beaings is impaied. It has been found though expeience that a pemanent defomity of. times the diamete of the olling element, occuing at the most heavily stessed contact point between the aceway and the olling elements, can be toleated without any impaiment in unning efficiency. The basic static load ating efes to a fixed static load limit at which a specified amount of pemanent defomation occus. It applies to pue adial loads fo adial beaings and to pue axial loads fo thust beaings. The maximum applied load values fo contact stess occuing at the olling element and aceway contact points ae given below. Fo ball beaings 2MPa2kgf/mm 2 Fo self-aligning ball beaings MPa9kgf/mm 2 Fo olle beaings MPakgf/mm 2 Refeed to as "basic static adial load ating" fo adial beaings and "basic static axial load ating" fo thust beaings, basic static load ating is expessed as Co o Coa espectively and is povided in the beaing dimensions table. Allowable static equivalent load Geneally the static equivalent load which can be pemitted is limited by the basic static ating load as stated above. Howeve, depending on equiements egading fiction and smooth opeation, these limits may be geate o lesse than the basic static ating load. This is geneally detemined by taking the safety facto So given in Table. and fomula (.) into account. So =CoPo. whee, SoSafety facto CoBasic static load ating, N {kgf} adial beaings: Co, thust beaings: Coa PoStatic equivalent load, N {kgf} adial beaings: Po, thust beaings: Poa.. P/C Fig..9 Coelation between P/C and antn (effect ofwith olle beaing) 2

25 Technical Data Table. Minimum safety facto values So Opeating conditions Ball beaings Rolle beaings High otational accuacy necessay 2 Nomal otating accuacy necessay (Univesal application) Slight otational accuacy deteioation pemitted (Low speed, heavy loading, etc.).. Note: When vibation and/o shock loads ae pesent, a load facto based on the shock load needs to be included in the P max value. Allowable axial load A geate axial load can be exeted on a main spindle beaing on a machine tool allowing fo tool changes while the machine is stationay. When an angula contact ball beaing is subjected to a lage axial load, the contact ellipse between its olling elements and aceway suface can oveflow the aceway suface (Fig..). Futhemoe, even if the contact ellipse emains within the aceway suface, ovestessing can cause poblems such as denting. The maximum allowable load that does not cause such poblems is defined as the "allowable axial load." The allowable axial load is eached when eithe of the following conditions occus. The end of contact ellipse on the aceway suface eaches the shoulde of eithe an inne o oute ing. The contact suface pessue on the aceway suface eaches MPa in eithe the inne o oute ing aceway. Note that the contact suface pessue of MPa on the aceway suface is a value that leads to a pemanent defomation of.2 to. times as much as the olling element diamete and has been detemined though many yeas of expeience. The allowable axial load fo each beaing is found in the associated dimensions table.. Allowable Speed High beaing speed leads to high tempeatue ise on the beaing owing to fictional heating within the beaing. When the tempeatue of the beaing exceeds a paticula limit, the lubicant pefomance deteioates significantly, possibly leading to beaing oveheating o seizue. The factos that can affect the maximum allowable beaing speed include: () Beaing type (2) Beaing size () Lubication system (gease lubication, ai-oil lubication, jet lubication, etc.) () Intenal cleaance o peload on the beaing () Beaing aangement (2-ow, -ow, -ow) () Beaing load () Accuacies of shaft, housing, etc. The maximum allowable speeds listed in the beaing dimensions tables ae efeence values and ae applicable only to individual beaings that ae adequately lubicated and coectly peloaded unde a condition whee the heat is eliably emoved fom the beaing aangement. In the case of gease lubication, these speeds ae attainable only when the beaing is filled with an adequate amount of high-quality gease as given in Table., the beaing is sufficiently un in, and heat is emoved by an aangement such as a cooling jacket. In the case of oil lubication, these speeds ae attained only by an ai-oil lubication system if an adequate amount of VG o 2 spindle oil is supplied and the heat is emoved by an aangement such as a cooling jacket. When using a lage amount of lubicant, a jet lubication system excels in lubication and cooling pefomance, and can pemit opeation at the maximum allowable speed. Howeve, this lubication system involves a high powe loss and should be employed caefully. Fa a H Speed facto The maximum allowable speed of a paticula beaing can vay depending on the elation between heat geneation and heat dissipation in the beaing as well as how well the beaing is lubicated. The beaing aangements (2-ow to -ow) and speed eduction atios (speed factos) fo maximum allowable speed due to post-assembly peloads ae summaized in Table.. H Shoulde height of beaing a Semimajo of contact ellipse Fa Axial load Fig.. Table. Speed facto by beaing aangement and peload Beaing aangement Matching DB DBT GL.. GN.. GM.. DTBT... 2

26 Technical Data. Beaing Aangements and Stuctues of Beaings fo Main Spindles Beaing Aangement fo Main Spindles Typical examples of beaing aangements fo main spindles of machine tools ae summaized in Table.. An optimal beaing aangement must be detemined though consideations about the popeties equied of the main spindle in question (maximum speed, adial and axial igidities, main spindle size, equied Table. Typical examples of beaing aangements fo main spindles accuacies, lubication system, etc.). Recently, an inceasing numbe of new machine tool models incopoate built-in moto type main spindles. Howeve, heat geneation on a built-in moto can affect the accuacy of the main spindle and pefomance of lubicant, so a main spindle beaing should be selected vey caefully. Beaing aangement fo main spindle Beaing type Typical applications Gea-diven configuation [Type!] Tapeed olle beaing + Tapeed olle beaing + Double-ow cylindical olle beaing Lage tuning machine Oil county lathe Geneal-pupose tuning machine Typical lubication Gease lubication Belt-diven configuation Belt-diven configuation [Type@] Double-ow cylindical olle beaing + Double-diection angula contact thust ball beaing + Double-ow cylindical olle beaing [Type#] Double-ow cylindical olle beaing + High-speed duplex angula contact ball beaing fo axial load + Single-ow cylindical olle beaing NOTE: high-speed vaiant of type@ CNC tuning machine Machining cente Boing machine Milling machine Typical lubication Gease lubication CNC tuning machine Machining cente Milling machine Typical lubication Gease lubication Belt-diven configuation Built-in moto-diven configuation [Type $] Duplex angula contact ball beaing (DBT aangement) + Double-ow cylindical olle beaing NOTE: high-speed vaiant of type@o # [Type %] Double-ow cylindical olle beaing + High-speed duplex angula contact ball beaing fo axial load + Single-ow cylindical olle beaing NOTE: high-speed vaiant of type#with built-in moto-diven configuation CNC tuning machine Machining cente Milling machine Typical lubication Gease lubication CNC tuning machine Machining cente Milling machine Typical lubication Gease lubication Ai-oil lubication 22

27 Technical Data Beaing aangement fo main spindle Beaing type Typical applications Built-in moto-diven configuation Built-in moto-diven configuation Built-in moto-diven configuation [Type ^] Single-ow cylindical olle beaing + High-speed duplex angula contact ball beaing fo axial load + Single-ow cylindical olle beaing NOTE: high-speed vaiant of type % [Type &] Duplex angula contact ball beaing (DTBT aangement) + Single-ow angula contact olle beaing (w/ ball slide) NOTE: supe high-speed vaiant [Type *] Duplex angula contact ball beaing (DTBT aangement) + Duplex angula contact olle beaing (w/ ball slide) NOTE: supe high-speed vaiant CNC tuning machine Machining cente Typical lubication Gease lubication Ai-oil lubication Machining cente <vetical> Typical lubication Gease lubication Ai-oil lubication Machining cente <vetical> Typical lubication Gease lubication Ai-oil lubication Built-in moto-diven configuation Built-in moto-diven configuation [Type (] Duplex angula contact ball beaing (DTBT aangement) + Single-ow cylindical olle beaing NOTE: supe high-speed vaiant [Type )] Adjustable peload beaing unit + Duplex angula contact ball beaing (DBT aangement) + Single-ow cylindical olle beaing NOTE: high-igidity/supe high-speed vaiant Machining cente Typical lubication Gease lubication Ai-oil lubication Machining cente Typical lubication Ai-oil lubication Built-in moto-diven configuation [Type)!] Duplex angula contact ball beaing (DT aangement) + Duplex angula contact ball beaing (DT aangement) Machining cente Small tuning machine Ginding machine Typical lubication Gease lubication Ai-oil lubication Belt-diven configuation [Type )@] Duplex angula contact ball beaing (DT aangement) + Duplex angula contact ball beaing (DT aangement) Ginding machine Typical lubication Gease lubication Ai-oil lubication Oil-mist lubication 2

28 Technical Data 2 Beaing selection based on beaing aangement fo main spindle An optimal beaing poduct that best suits the application is selected by efeing to the beaing selection table in Table.2, which contains the possible beaing aangements fo main spindles. Designate the fee side and fixed side. Select the beaing aangement type (I to XII) on the fee o fixed side. Select a set of beaing specifications applicable to the selected aangement type. Choose a lubication system suitable fo the selected beaing specifications. Select a poduct goup that satisfies the abovementioned consideations. Table.2 Beaing selection table Fix side Fee side Beaing specifications Lubication system Applicable poduct goups/ultage Steel balls/ceamic balls Consideations fo selection pocedue Sealed, 2 9 LLB/S-9 LLB LLB/S- LLB, 2, 2 2LA-BNS9 LLB/S-2LA-BNS9 LLB 2LA-BNS LLB/S-2LA-BNS LLB Beaing selection High-speed pefomance (geneal) HighLow Contact angle, 2, 2, Duplex angula contact ball beaing o adjustable peload beaing mechanism + Duplex angula contact ball beaing Single-ow angula contact ball beaing o duplex angula contact ball beaing (w/ ball bush) Beaing aangement Beaing aangement [Type &, *, )!, [Type $&*(o )@ ] )!o )@ Cylindical olle beaing + Duplex angula contact ball beaing Beaing aangement [Type@,#,% o ^] Tapeed olle beaing + Cylindical olle beaing Beaing aangement [Type!] Double-ow cylindical olle beaing o single-ow cylindical olle beaing Beaing aangement #,$, %, ^, (, o )] Angula contact ball beaing fo adial load Contact angle o smalle Cylindical olle beaing Angula contact ball beaing fo axial load Contact angle less than Thust contact ball beaing Cylindical olle beaing Ai-oil lubication Oil lubication Gease lubication Gease lubication Gease lubication Double-ow Single-ow C/S-C, 2,, 9U/S-9U U/S-U 2/S-2, 2, 2, 2LA-HSE9/S-2LA-HSE9 2LA-HSE/S-2LA-HSE Ginding machine main spindle/ moto shaft seies BNT9/S-BNT9 BNT/S-BNT BNT2/S-BNT2 Supe high-speed/dedicated ai-oil lubication seies 2 S-2LA-HSF Eco-fiendly type, 2, 2, S-2LA-HSFL NN/NNK NNHS/NNHSK NNHST/NNHSTK NNHSRT/NNHSRTK NN9/NN9K NNU9/NNU9K NHS/NHSK NHSRT/NHSRTK Eco-fiendly type NHSLT/NHSLTK HTA9A HTAA/S-HTAA HTA9U HTAU/S-HTA 29/29M 2/2M 29XU T-2X/2XU Inch seies tapeed olle beaing 2Rigidity Radial igidity HighLow Contact angle, 2, 2, Axial igidity LowHigh Contact angle, 2, 2,,, Complex igidity (adial and axial) High (-ow) Medium (-ow) Low (2-ow) Recommended aangement -ow (DTBT) o 2-ow (DB) Recommended lubication specifications Standad main spindle : Gease High-speed main spindle : Ai-oil Low-noise : Gease o eco-fiendly ai-oil Pesence of cooling jacket aound the beaing. In paticula, gease lubication is ecommended. 2

29 Technical Data Adjustable peload beaing unit A ecent tend in the machine tool industy is a steady incease of opeating speeds. The maximum dmn value (pitch cicle diamete acoss olling elements dmmm multiplied by speed nmin - ) eached by main spindles with ai-oil lubicated lubication can be as high as 2. to.. At the same time, main spindles ae equiing inceased igidity. Theefoe, main spindle beaings must be capable of both high-speed opeation and high igidity. This can be achieved though optimal peloading. A fixed peload (sping peload) system is usually employed to satisfy both these high speed and high igidity equiements. A spindle unit with fixed-position peload that is adjustable fo diffeent speed conditions is advantageous fo optimizing the igidity of the unit. The NTN Adjustable Peload Beaing Unit is a highspeed, high-igidity unit that featues fixed position peload that can be adjusted fo diffeent speed conditions. The NTN Adjustable Peload Beaing Unit is illustated in Fig... Hydaulic pessue is used to shift the position of the adjustable peload sleeve situated in the ea beaing section of the unit. This changes the peload on the beaings. A spindle incopoating a -step adjustable peload beaing unit is illustated in Fig..2. The sleeve in the adjustable peload section is compised of two hydaulic pessue chambes, A and B, as well as a spial goove fo sliding motion. The peload can be adjusted to one of thee settings by changing the hydaulic pessue in each of the chambes. To achieve instantaneous and eliable adjustment, high-pessue oil (at the same pessue as in the hydaulic chambes) is supplied to the spial goove on the outside of the sleeve. This oil povides lubication so that the sleeve can move smoothly. Angula contact ball beaing with ceamic balls Adjustable peload section Adjustable Hydaulic pessue chambe A peload sleeve Hydaulic pessue chambe B Hydaulic pessue in spial goove (fo sliding motion) Adjustable peload unit Wok piece side Locating side beaing Peload adjustment side beaing Dive side Beaing box Main spindle Angula contact ball beaing with ceamic balls Fig.. Adjustable peload beaing unit Low speed ange (high peload) Medium speed ange (medium peload) High speed ange (low peload) 2 Spial goove Hydaulic pessue ON (Positive sign means cleaance, while negative sign means peload.) Hydaulic pessue ON (Positive sign means cleaance, while negative sign means peload.) Hydaulic pessue OFF (Positive sign means cleaance, while negative sign means peload.) L2 L Fig..2 Typical spindle configuation incopoating -step Adjustable Peload Type Beaing Unit Opeating mechanism Fig.. shows the hydaulic opeation of the unit fo thee peloading conditions as well as the associated motion of the adjustable peload sleeve. Low speed opeation(high peload): Chambe A is pessuized. Component moves to the ight by a peset cleaance L and contacts component. The axial cleaance is. Medium speed opeation(medium peload):chambe B is pessuized. Components and 2 move to the ight by a peset cleaance L2, causing Component 2 to contact Component. The axial cleaance is2. High speed opeation(low peload):chambes A and B ae not pessuized. Components and 2 etun to the left due to the eaction foce on the beaing. This causes Component 2 to contact Component, theeby etuning the axial cleaance to the initial setting of. NOTE: The etun motion of the components and 2 is achieved by the eaction foce of beaing o a sepaately povided sping. Fig.. Opeating mechanism of Adjustable peload 2

30 Technical Data Beaing jacket cooling system With a built-in moto dive system, the main spindle is diectly diven by a moto and is theefoe suitable fo apid acceleation o deceleation. Howeve, this system can be advesely affected by tempeatue ise. A cooling jacket with a spial goove aound the housing allows cooling oil to flow though the unit. If heat geneated by the moto affects the beaing, oveheating of the beaing as well as degadation of the gease can occu. This situation must be stictly avoided. When designing a cooling system with jacket cooling, the following should be consideed. Consideations about cooling of jacket A typical beaing aangement is shown in Fig.. and., compising a double-ow cylindical olle beaing and an angula contact ball beaing set. The cooling goove on the jacket in Fig.. stats at aound an aea above the angula contact ball beaings and does not cool the double-ow cylindical olle beaing effectively. (Note that the fit of the angula contact ball beaings with the boe of the housing is a cleaance fit-the beaings ae not in diect contact with the housing) In the configuation in Fig.., the cooling goove extends to the egion above the double-ow cylindical olle beaing, and cools both the angula contact ball beaings and the double-ow cylindical olle beaing effectively. IN OUT Cooling goove on jacket IN Cooling goove on jacket OUT Fig.. Inadequate cooling goove on jacket Fig.. Adequate cooling goove on jacket Test conditions Test beaing Peload afte assembled Lubication system S-2LA-HSEDB N (Fixed position peloading) Ai-oil lubication Test conditions Test beaing Mounted adial cleaance Lubication system NN2HST -μm Gease lubication Tempeatue incease on oute ing C 2 w/ jacket cooling w/o jacket cooling 22 Speed min - Tempeatue incease on oute ing C 2 w/ jacket cooling w/o jacket cooling 2 Speed min - dmn value Fig.. Vaiation in beaing tempeatue depending on pesence/absence of jacket cooling (angula ball beaing) 2 dmn value Fig.. Vaiation in beaing tempeatue depending on pesence/absence of jacket cooling (cylindical olle beaing) 2

31 Technical Data. Handling of Beaings Cleaning and filling with gease To achieve maximum speed and limited tempeatue ise with a pecision olling beaing, it is vital to handle the beaing coectly. The handling of beaings involves cleaning, dying, filling with gease (if necessay), and the unning-in opeation. Fo each step, follow the pecautions and instuctions. A sealed beaing contains pefilled gease. Do not clean (inse) and dy this type of beaing. Only wipe away ustpeventive oil with a clean cloth befoe assembling the beaing. Cleaning (emoval of ust-peventive oil) Immese the beaing in keosene o a highly volatile solvent such as naphthesol and wash it by hand. Then emove the keosene using benzene o alcohol. Use clean compessed ai to blow away the insing fluid. (The beaing may be used as deliveed fo the ai-oil lubication. Howeve, we ecommend that afte cleaning, the beaing eithe be coated with the lubicant to be used o a less viscous oil, o be immesed in the lubicant o othe low-viscosity oil.) Dying If the beaing is to be used with gease lubication, it is necessay to thooughly dy the beaing to avoid leakage By using an injecto o small plastic bag, fill gease between balls in equal amounts, aiming at the olling suface of the inne ing. of gease. Afte dying, be sue to immediately fill the beaing with gease. Dying can be pefomed by blowing hot ai onto the beaing o placing the beaing in a chambe at constant tempeatue. When dying by hot ai, be sue to conside the cleanliness of the ai. Filling with gease The pocedues fo geasing ball and olle beaings can be found below. Afte filling with gease, tun the beaing by hand to unifomly distibute the gease to the whole olling suface. <Ball beaings> See Photo. By using an injecto o small plastic bag, fill gease between balls in equal amounts, aiming at the inne ing olling suface. Fo a beaing with a ing-guided cage, also apply gease to the guide suface of the cage using a spatula o simila tool. If gease cannot be filled into the inne ing olling suface because of a small gap between the cage and the inne ing add gease to the oute ing olling suface. In this case, caefully tun the beaing so that the gease is fully spead on the inne ing side. <Rolle beaings> See Photo.2 Apply gease to the oute (inne) side of olles, and while tuning the olles with finges, spead the gease to the inne ing (oute ing) side. Apply gease to the oute cicumfeence of cage. Afte completion of filling Apply gease to the oute side of the olles, and while tuning the olles with finges, spead the gease to the inne ing (oute ing) side. Tun the beaing by hand while applying an appopiate load in the contact angle diection so that the any aea in the inteio of beaing is sufficiently lubicated with gease. (Afte applying gease) If a lump of gease emains on the oute face of cage ib, the unning-in opeation can take a longe time. With finges, spead the gease deposited on the oute suface of the ib on the cage. Photo.. Filling gease into angula contact ball beaing Photo..2 Filling gease into cylindical olle beaing 2

32 Technical Data Running-in opeation () Ai-oil o oil-mist lubication The unning-in opeation is elatively simple with oil lubication because no peak tempeatue occus and the beaing tempeatue stabilizes within a elatively shot time. NTN ecommends that the speed of beaing is to be inceased in steps of 2 to min - until the maximum speed is eached. Evey speed setting should be maintained fo about minutes. Howeve, fo the speed ange whee the dmn (pitch cicle diamete acoss olling elements multiplied by speed) exceeds,,, incease the beaing speed in steps of to 2 min - to ensue the stable unning. (2) Gease lubication Fo a gease-lubicated beaing, a unning-in opeation is vey impotant in attaining stable tempeatue ise. Duing a unning-in opeation, a lage tempeatue ise (peak) occus while the beaing speed is inceased, and then the beaing tempeatue eventually stabilizes. Befoe tempeatue stabilization, a cetain lead time will be needed. Ball beaing NTN ecommends that the beaing speed be inceased in steps of to 2 min - and be futhe inceased only afte the tempeatue has stabilized at the cuent speed setting. Howeve, fo the speed ange whee the dmn exceeds,, incease the beaing speed in steps of to min - to ensue the stable unning. Rolle beaing Compaed with contact ball beaings, the time to peak tempeatue o satuation in unning-in opeation of olle beaings tends to be longe. Also, thee will be tempeatue ise due to whipping of the gease and the tempeatue ise may be unstable. To cope with this poblem, un the olle beaing in the maximum speed ange fo a polonged peiod. Incease the beaing speed in steps of to min - only afte the beaing tempeatue has stabilized at the cuent speed setting. Fo the speed ange whee the dmn exceeds,, incease the beaing speed in steps of min - to ensue safety. 2 Mounting When mounting a beaing to a main spindle, follow eithe of the mounting techniques descibed below () Pess-fitting with hydaulic pess (2) Mounting by heating beaings With eithe technique, it is impotant to minimize the advese effects of the mounting pocess to maintain beaing accuacy. () Pess-fitting with hydaulic pess Befoe pess-fitting a beaing with a hydaulic pess o hand pess, the pess-fitting foce due to the intefeence between the shaft and inne ing must be calculated. A hydaulic pess having a capacity geate than the equied pess-fitting foce must used. Next, using an inne ing pess-fitting jig, the inne ing is coectly pess-fitted to the shoulde of shaft. Please be caeful not to exet a foce on the oute ing. Afte the pess-fitting opeation, it is impotant to measue the accuacies of vaious potions of the beaing to veify that the beaing has been coectly mounted to the shaft. When using a multi ow beaings, measue the unout afte assembly and coect misalignment acoss the oute ings as necessay. Hydaulic pess Pess-fitting jig Fig.. Pess-fitting pessue Shaft otation Fig..2 Checking fo face unout of inne ing Measuement of concenticity of oute ing Fig.. Checking fo concenticity of oute ing Calculation of pess-fitting foce The pess-fitting foce occuing fom the intefeence between the shaft and inne ing can be detemined by the fomula given below. Accoding to the calculated pess-fitting foce, a hydaulic pess having a sufficiently lage capacity must be used to mount the beaing. The vaiations in dimensional eos among the beaings should be consideed. The foce needed to pess the inne ing to the shaft can be obtained with the following fomula (.). Foce to pess-fit inne ing to shaft KdPdB. whee, Kd: Foce fo pess-fitting o extacting an inne ing N P : Suface pessue on fitting suface MPa (see Table.) d : Shaft diamete, inne ing boe diamete mm D : Oute ing outside diamete mm B : Inne ing width : Sliding fiction coefficient (when pess-fitting inne ing ove cylindical shaft:.2) 2

33 Technical Data Table. Fitting suface pessue MPa Kgf mm 2 Fitting conditions and calculation fomulas Fits between solid steel shaft and inne ing P E 2 deff d 2.2 d Di d deff d. d2 (In the case of a gound shaft). d : Theoetical intefeence fitting Symbol (unit N [kg]-mm) d : Shaft diamete, inne ing boe diamete do : Hollow shaft boe diamete Di :Inne ing aveage aceway goove Fits between hollow steel shaft and inne ing diamete 2 2 E deffdodi doddeff : Effective P 2 intefeence 2 d dodi E : Modulus of longitudinal elasticity = 2 GPa dd D i.. d Fig.. Example of calculation fo pess-fitting foce The calculation fo pess-fitting foce fo tight fit of 2 m intefeence between the shaft and inne ing fo the standad angula contact ball beaing is as summaized below: 2UC ( 2) Intefeence fit of 2m (solid shaft) deff Di P 2.2 MPa 2. Kd.2.22 N B d Di (2) Mounting by heating beaings When mounting a beaing to a shaft using a constant tempeatue chambe, beaing heate o the like, follow the instuctions below. Heat the beaing at a tempeatue that eflects the intefeence between the shaft and inne ing (see Fig..). Assuming linea expansion coefficient 2. -, heating tempeatuet, inne ing boe diamete d, and intefeence fit 2. - dt Ex.) If d = mm, and =. ( m, tight fit), then the equied heating tempeatue T = 2. C. Theefoe, the beaing should be heated to appoximately oom tempeatue + C. Note that in pactice, the lowe-tempeatue shaft will cool the beaing, causing it to shink. Consequently the beaing may need to be heated by moe than C fo assembly. NOTE If a esin mateial is used fo the cage of angula contact ball beaing, do not excessively heat the beaing (appox. C max.). As a esult of heating beaings afte cooling, the inne ing will axially shink, and thee will be cleaance between the beaing side face and shaft shoulde (Fig..). Fo this eason, keep the beaing and shaft foced togethe with a pess o the like until the unit etuns to nomal tempeatue. Afte cooling, check that the beaing is mounted to the shaft coectly. When using a beaing heate, be sue to avoid oveheating. To pevent beaing fom being magnetized, use equipment that has a demagnetizing featue. Diametic expansion of inne ing boe m Diffeence in tempeatue befoe and afte heating the beaing 9 C k j C C C 2 2 Beaing boe diamete mm Fig.. Requied heating tempeatue fo mounting by heating inne ing Remaks: The maximum intefeence amounts ae intefeence values associated with class beaings. p n m C C C Max. intefeence amount m To accommodate fo vaiation in the lubication conditions, incopoate a safety facto of 2 to. As a esult, the equied pess-fitting foce is: (2 to ) = 9 to N Afte cooling Shinkage Fig.. Cooling afte mounting by heating beaings 29

34 Technical Data Tightening of inne ing When mounting and secuing a beaing to a main spindle, the inne ing side face is usually clamped with a stepped sleeve o pecision beaing nut, and the font cove situated on the oute ing side face is bolted down. When utilizing a stepped sleeve o pecision beaing nut to clamp the inne ing, the following pecautions must be followed. Tightening with stepped sleeve The stepped sleeve is designed that the hydaulically expanded sleeve is inseted ove the shaft, and a pedetemined dive-up foce (tightening foce) is applied to the shaft. Then the hydaulic pessue is eleased in ode to secue the sleeve onto shaft and povide a tightening foce to the beaing. This technique is a elatively simple locking method (Fig..). Note howeve afte being locked in position by intefeence with the shaft, the sleeve can come loose because of deflection of the shaft o a moment load applied to the shaft. Fo this eason, in many cases, a stepped sleeve is used togethe with a beaing nut as illustated in Fig... Stepped sleeve Application of tightening foce Hydaulic pessue Fig.. Tightening with stepped sleeve Stepped sleeve Pecision beaing nut Fig.. Tightening with stepped sleeve + pecision beaing nut Tightening with pecision beaing nut Requied tightening foce is achieved with the pecision beaing nut (pecision locknut) by coectly contolling the tightening toque. Note that when a beaing has been locked with a pecision beaing nut (lock nut), the nut can develop inclination owing to the cleaance on the theaded potions. If this poblem occus, fine adjustment will be necessay to obtain necessay unning accuacy fo the shaft. Locking setscew Pecision lock nut Coelation between tightening toque and tightening foce with pecision beaing nut The coelation between tightening toque and tightening foce with a pecision beaing nut can be defined with the fomula given below. Because the thead face of the pecision beaing nut, the thead face of the shaft and the beaing suface and nut constitute sliding sufaces, the coelation between tightening toque and tightening foce will vay depending on the fiction coefficient. Theefoe, the nut needs to be thooughly un on the shaft thead in advance to ensue smooth and unifom tightening. It is also necessay to detemine the coelation between tightening toque and tightening foce by using a load washe o the like in advance. M F. d2tan n n F Thead tightening foce N M Nut tightening toque N-mm d Effective diamete of thead mm Fiction angle of thead face tan. cos Lead angle of thead tan numbe of theadspitch/d. n Aveage adius of beaing nut suface mm nfiction coefficient of beaing nut suface n. Fiction coefficient of thead face. Half angle of thead Example calculation Beaing nut AN2 (Fig..) Thead data M2 (class 2 thead) Effective diamete d=9. mm Half angle of thead = Fig.. The coelation between a tightening toque and tightening foce with the pecision beaing nut can be calculated as follows:. tan cos 2 tan 9. (2)2 n.2 2 F 9. 2 M M tan Fig..9 Tightening with pecision beaing nut

35 Technical Data Elastic defomation of space by tightening foce When incopoating a beaing into a main spindle, the beaing must be coectly foced into a pedetemined position and maintained with a pedetemined beaing pessue in ode to maintain appopiate accuacies, cleaances and igidities of the beaing and main spindle. When axially locating a duplex angula contact ball beaing by using a beaing space the coss-sectional aea of space as well as (depending on the tightening foce) the beaing pessue and elastic defomation by tightening of the space must be consideed. Coelation between inne ing space tightening foce and amount of elastic defomation When secuing an angula contact ball beaing onto a main spindle, the beaing inne ing is tightened and locked by the shoulde of main spindle and a beaing nut and/o stepped sleeve. This inne ing tightening foce causes the space to develop elastic defomation in the axial diection, vaying the axial cleaance on the beaing. In the case of a back-to-back duplex beaing (DB, DTBT o DBT) fo a main spindle in paticula, the inne ing tightening foce will decease the beaing cleaance, possibly leading to an inceased postassembly peload and opeating peload. A possible inne ing tightening foce-deived axial defomation can develop in the fom of defomation of both the inne ing and inne ing space. Howeve, NTN's expeience has shown that only the elastic defomation on inne ing spaces needs to be consideed. Inne ing tightening foce Elastic defomation Fig.. Elastic defomation of inne ing space The amount of defomation of a space is calculated using the following fomula: PL.9 AE Elastic defomation mm P Inne ing tightening foce N L Inne ing space width mm A Inne ing coss-sectional aea mm 2 E Youngs modulus 2, MPa The equie tightening foce exeted onto inne ing spaces vaies depending on the beaing manufactue. Fom its expeience, NTN adopts the typical values listed in Table.2. Table.2 Nut tightening foce Beaing boe diamete (mm) Nut tightening foce (N) Font cove dive-up (mm)..2 NOTE ) NTN has specified the nut tightening foces in this table based on expeiences fom eviewing and assessing the dawings fom uses. Howeve, NTN has no poduction ecod fo boe diamete of 22 mm o lage. Thus, the nut tightening foces in paentheses ae estimated values. NOTE 2) Fo ball scew suppot beaings (BST), a tightening toque appoximately times as lage as the peload is ecommended. Font cove dive-up When mounting and secuing a beaing onto a main spindle, the inne ing is usually tightened with a stepped sleeve o pecision beaing nut and the oute ing side is bolted down. When locking the oute ing with a font cove, the following points need to be consideed. Font cove pessing amount The beaing oute ing is tightened and locked between the shoulde of the housing and font cove at the main spindle font section. The font cove is installed by utilizing bolt holes ( to positions) on its flange. The usual pessing allowance on the oute ing and the font cove, which NTN has adopted though expeience, falls in a ange of. to.2 mm. Too lage a pessing amount on the oute ing o a smalle numbe of fastening bolts may lead to poo oundness of the beaing ing. Typical fit and deteioation in oundness of a aceway suface esulting fom a pessing amount of. mm on the oute ing ae shown in Fig... Also, typical oute ing pessing amount and deteioation of a aceway suface with a fit of m loose ae povided in Fig...

36 Technical Data To avoid defomation of the oute ing aceway suface, NTN ecommends that the oute ing be installed to a highly accuate housing in tansition fit with a lage numbe of bolts. 2(=. to.2 mm is ecommended) 2 Locked with bolt Deteioation in oundness of aceway suface (m) 2 Fit: m loose Bolt tightening toque: 2 kn-cm Bolts, 2 pos. Bolts, pos Pessing allowance on oute ing (mm) Font cove Fig.. Pessing allowance on oute ing vs. deteioation in oundness of aceway suface Fig..2 Font cove pessing allowance Checking axial igidity In the typical method fo checking fo the axial igidity of a beaing installed to a machine tool, the main spindle itself is pushed with a push-pull gage to measue the esultant axial displacement. A method using a dial indicato is descibed below. Two dial indicato ae placed on two locations (axisymmetic locations sepaated by ) at the leading end of the main spindle. Use magnetic stands to secue the dial indicato to the end face of housing. Then, apply the load onto the main spindle and the esultant axial displacement is measued. Fig.. Measuing position fo oundness on oute ing aceway suface Shaft end of main spindle Dial indicato Hydaulic cylinde Deteioation in oundness of aceway (m) 2 Pessing amount on oute ing:. mm Bolt tightening toque: 2 kn-cm Bolts, 2 pos. Bolts, pos. 9 2 Fitting amount allowance between beaing outside suface and housing (m) Dial indicato Photo. Fig.. Effect of fit of oute ing on oundness of aceway suface Measuing load (push-pull gage etc.) Dial indicato Dial indicato Fig.. Checking fo axial igidity 2

37 Technical Data Cleaance adjustment fo cylindical olle beaing When incopoating a cylindical olle beaing into a main spindle of a machine tool such as an NC tuning machine o machining cente, and setting the intenal cleaance to zeo o to a negative cleaance, the inne ing of the beaing usually has a tapeed boe. The intenal cleaance is adjusted by fitting the tapeed boe beaing onto the tapeed potion of the main spindle and diving the beaing in the axial diection to expand the inne ing. Fo adjusting the intenal cleaance, two methods ae available: a method consisting of cleaance measuement fo each beaing and adjustment with a space(s), and a method with a post-mounting intenal cleaance adjustment gage. Method with cleaance measuement and adjustment with space (s) Adjust the beaing intenal cleaance by following the pocedue descibed below: () Calculation of oute ing shinkage (see Fig..) Calculate the intefeence at the fitting aea deff between the oute ing and housing. Measue the housing boe diamete fist, and then calculate the intefeence deff fom the oute ing outside diamete listed on the beaing inspection sheet. EX. Beaing oute ing outside diamete mm (Inspection sheet = -.) Housing boe diamete D mm (measuement data = -.) Intefeence at fitting aea deff =.2 (2 m tight) Calculate the oute ing shinkage G with the fomula (.). Dh D D Housing Fig.. Fit between oute ing and housing D DDh 2 Gdeff. D DD 2 DDh 2 EX. 2 Housing outside diamete Dh=2, oute ing outside diamete D=, oute ing boe diamete D = /2 2 G.2.. / 2 /2 2 (2) Measuement of beaing position and beaing adial cleaance on a tempoaily mounted beaing Mount the beaing inne ing with the cage and olles onto the tapeed shaft (see Fig..). In this pocess, foce the inne ing until its tapeed boe face is fully seated, and then measue the distance between the shaft shoulde and inne ing side face (L). NOTE: Afte mounting the inne ing, check that the beaing side face is squae to the main spindle centeline. At this point, mount the oute ing, move the oute ing up and down by hand and then measue the intenal cleaance afte mounting ()(see Fig..9). Calculate the estimated beaing cleaance afte pess-fitting the oute ing into the housing with the fomula (.2). The esult of the calculation eflects the oute ing shinkage G. G.2 EX. Intenal cleaance afte mounting =. Oute ing shinkage G=. Estimated beaing cleaance =. -. =.2 () Adjustment of space width between shaft shoulde and inne ing To adjust the beaing cleaance to a pedetemined taget value () afte mounting, detemine the space width Ln with the fomula (.) (efe to Figs..2 and.2). LnLf. n2 The value f in the fomula (.) is found in the table below. L Ln n Table. Value f Value dmdi Value f Fig.. Measuement of beaing position Fig..9 Measuement of beaing adial cleaance Fig..2 Cleaance measuement afte insetion of space di dm Fig..2 Explanation of dmdi

38 Technical Data EX. In the case of NN2K, if d = dia., width B =, and di = d + /2 B/2, then di = dia... If the tageted post-mounting cleaance value =., L =, dm = dia., =.2, then dm/di= /. =.99, and, theefoe, f =. Thus, the space width Ln between the shoulde and inne ing equivalent to =. will be the value shown by the fomula below: Ln..2. () Beaing cleaance measuement afte insetion of space (see Fig..2) Inset a space that satisfies the space width Ln between the shoulde and inne ing detemined in the pevious step, and tighten the inne ing until the space does not move. Next, move the beaing oute ing up and down by hand and measue the intenal cleaance afte mounting (post-mounting intenal cleaance) n. The estimated beaing cleaance n afte pess-fitting of the oute ing into the housing is detemined with the fomula below: n2 nng. () Final adjustment fo space width Repeat the steps () and () above to gadually decease the space width Ln so as to adjust the postmounting beaing cleaance to the tageted cleaance. By plotting the coelation between the space width and post-mounting cleaance as illustated in Fig..22, the space width fo the final tageted cleaance will be moe eadily obtained. Positive cleaance: All olles ae sliding athe than olling. Cleaance = : About half of the olles ae olling but the est ae sliding. Negative cleaance: All olles ae olling. Measuement with mounted intenal cleaance gage The mounted intenal cleaance gage has a cylindical ing, which has a cut-out so that the ing can be opened and closed. The boe suface of the ing is used as a location fo measuement. The cleaance at the location fo measuement is popotional to the eading on the dial indicato. As illustated in Fig..2, the cleaance gage consists of a ing gage, dial indicato, and attachment components. Its fixtue potects the intefeence gage against possible defomation when not in use. Fo the measuing opeation, detach the fixtue. Dial indicato Gage suppot bolt Gage bolt Fixtue Open/close bolt NTN NNXXK Ring gage Handle Fig..2 Desciptions of vaious components on mounted intenal cleaance measuement gage Usage of mounted intenal cleaance gage () Measuement of oute ing aceway diamete (boe diamete) Mount the oute ing into the housing. (Fo easy mounting, heat the housing.) Wait until the tempeatue of the oute ing is same as that of the inne ing, and then measue the oute ing aceway diamete (boe diamete). Take measuements at seveal points and calculate the aveage, and then zeo the gage at this aveage value.. Assembled cleaancemm..2. Tageted value Photo Space width Lnmm Fig..22 Coelation between space width Ln and post-mounting cleaance n

39 Technical Data (2) Setup of mounted intenal cleaance gage Place the cylinde gage, onto the boe suface of cleaance adjustment gage as shown in Photo., and adjust it with the open/close bolt so that its dial is set to zeo (see Photo.). When the eading of dial of the cylinde gage is zeo, adjust the gage bolt so that the pointe of dial 2 points at the ed mak (coection amount of the gage). (Photo.) With the gage bolt, adjust the gage so that the shot pointe is situated at the scale 2 position. (With the lage size, inset the pin into the hole of the open/ close bolt and make fine-adjustment.) NOTE ) Photo. shows the inne ing and olles. When the coection amount of the gage is adjusted, adjust it only with the thickness gage. NOTE 2) The pointe of dial 2 is diected to the ed mak. The pupose of this is to compensate cleaance eo caused due to the stuctue of mounted intenal cleaance gage. The coection amount can vay fom gage to gage. NOTE ) When the pointe of dial 2 is in line with the ed mak, the zeo eading on dial 2 coincides with the zeo beaing cleaance. () Setting up the mounted intenal cleaance gage on the main spindle Mount the inne ing onto the main spindle, and lightly tighten the beaing nut. Tightening the open/close bolt (see Fig..2) on the cleaance adjustment gage will cause the gage boe to expand. With the gage boe expanded by about. mm, inset the gage into the outside diamete potion of the olle set in the inne ing. Be caeful not to damage the olles (Photo.). Loosening the open/close bolt will cause the gage boe to shink. Loosen the open/close bolt to bing the gage boe into contact with the outside diamete of the ball set in the inne ing. Lightly swing the cleaance adjustment gage in the cicumfeential diection to stabilize the pointe on the dial indicato. the distance between the inne ing side face and shaft shoulde (dimensionrin Fig..2). Measue this dimension in at least thee locations, and finally adjust the space widthrto the aveage of thee measuements. Loosen and emove the shaft nut, inne ing space and inne ing fom the main spindle. Dial 2 Photo. Photo. Dial () Setup of inne ing cleaance Tighten the shaft nut of the main spindle. This should be done gadually to pevent shock loading. Tightening the nut futhe until the eading on the dial of the cleaance adjustment gage becomes zeo in case the cleaance is aimed at m. Once the eading on gage gets zeo, caefully swing the adjustment gage again to check that the measuement value is coect. Loosen the open/close bolt on the cleaance adjustment gage to expand the gage boe and emove the gage fom the inne ing. R Photo. Shaft nut () Detemination of space width The inne ing should now be in the position whee the eading on the dial of cleaance adjustment gage was zeo in step (). By using a block gage, measue Fig..2 Space width dimension

40 Technical Data () Assembly and check of the mounted olle outside diamete Inset a space of widthr. Then inset the inne ing and mounting space and tighten the shaft nut. Accoding to a pocedue simila to that in steps () Setting up the mounted intenal cleaance gage on the main spindle and () Setup of inne ing cleaance, check the mounted olle outside diamete and the cleaance setting. Note this pocess is only a e-check pocedue, and may be omitted once the cleaance measuements fall in a smalle ange. Cleaance coection facto and mounted intenal cleaance eading () Cleaance coection facto Because of the stuctue of the NTN mounted intenal cleaance adjustment gage, the atio of the cleaance eading on location fo measuement to the eading on dial indicato is :2. (cleaance indication facto). The cleaance eading on the dial indicato is 2. times as lage as the emaining intenal cleaance. Fo efeence, a cleaance eading convesion table is given in Table.. NOTE: Note that the cleaance coection facto of cetain beaing numbes is not :2.. Coection facto is given on the table of inspection esults. (2) Remaining intenal cleaance (whee cleaance indication value :2.) The eading on the dial indicato is conveted into a mounted intenal cleaance in the following manne: CASE : The eading elative to the zeo point is in the clockwise diection (CW) (Fig..2). The value of the mounted intenal cleaance (+) is /2. times as lage as the eading on dial gage. Reading on dial gage in Fig..2 = 2. Remaining intenal cleaance = 2./2. = (+)m CASE 2: The eading elative to the zeo point is in the counteclockwise diection (CCW) (Fig..2). The value of the mounted intenal cleaance (-) is Table. Cleaance eading convesion table Fig..2 /2. times as lage as the eading on dial gage. Reading on dial gage in Fig..2 =. Remaining intenal cleaance =./2. = (-)2m Setup of mounted intenal cleaance When setting the mounted intenal cleaance to a specific negative o positive value, the zeo point on dial indicato by a value [tageted cleaance multiplied by 2.] may be shifted pio to the setup of the cleaance adjustment gage. (In case that the mounted cleaance value is divided by the coection facto, it is not necessay to the value [tageted cleaance multiplied by 2.]) (2.: cleaance coection facto) Fig..2 Adjustment fo negative cleaance (emaining intenal cleaance: -. m) Fig..2 Adjustment fo positive cleaance (emaining intenal cleaance: +. m) Pecautions fo using and stoing the mounted intenal cleaance adjustment gage When using the mounted intenal cleaance adjustment gage, follow the pecautions descibed below: When tansfeing the oute ing aceway diamete measued with the cylinde gage to the mounted intenal cleaance adjustment gage, use the adjustment gage in a vetical attitude (Photo.). When not using the mounted intenal cleaance adjustment gage, place it in a hoizontal attitude (Photo.9). Also, afte completion of cleaance measuing opeation, apply ust-peventive oil to the intenal cleaance adjustment gage and stoe in a dy location. Fig..2 Reading on dial gage (m) Remaining intenal cleaance on location fo measuement (m) Reading on dial gage (m) Remaining intenal cleaance on location fo measuement (m) Photo. Vetical stoage attitude Photo.9 Hoizontal stoage attitude

41 Technical Data Tapeed boe cylindical olle beaing and main spindle tape angle In ode fo a pecision beaing to pefom as designed, it must be coectly mounted to a shaft and housing. In paticula, when employing a tapeed boe cylindical olle beaing, accuate finish fo the tapeed main spindle and appopiate fit between the beaing boe and the main spindle ae vey impotant to ensue high accuacy of the main spindle. NTN ecommends that the custome use the NTN tapeed shaft ing gage, which that is finished to same accuacies as the beaing, so that the custome can achieve highe pecision. NTN also offes a plug gage so that the custome can check the accuacy of the ing gage. Tape gage fo pecision olle beaings Each NTN pecision cylindical olle beaing tape gage consists of a female gage and a male gage (plug gage) (Fig..29). Using blue paste o an equivalent as well as a ing gage, check the fit of the beaing boe with the main spindle tape. The coect fit between the main spindle and the beaing leads to highe accuacy of the main spindle. The plug gage is intended to check the accuacy of the associated ing gage. Use the plug gage to veify the tape accuacies of the associated ing gage (Fig..). d B Tape /2 Plug gage (TA) d D d Fig..29 Tape gage B Tape /2 d Ring gage (TB) Usually, Using blue paste between the tapeed boe of a cylindical olle beaing and a plug gage exhibits a stong contact mak on the small diamete side as show in Fig... This is because NTN has slightly adjusted the tape angle of the beaing boe to accommodate fo the diffeence in thickness of the inne ing below each ow of olles. Fig.. Checking main spindle tape with ing gage When checking the main spindle tape angle with a ing gage, pefom the following steps. Thooughly clean the suface of the ing gage, and apply a thin laye of blue paste to fou equally-spaced points. Clean the tapeed suface of the shaft, and gently inset into the ing gage. The ing gage to be lightly tuning it. Check the pattens of blue paste deposited on the shaft suface. At this point, attach a stip of clea adhesive tape onto each blue paste spot, and peel off each stip. Attach stips of adhesive tape onto white pape and check how much blue paste was deposited onto each point. Check that moe than % of the applied blue paste was deposited on the tapeed suface. Fig..2 Application of blue paste to ing gage Fig.. Blue paste on tape gage Tape angle NTN machines the tapeed boe of its cylindical olle beaings and the tape angle of its tape gages accoding to the toleances below: Nominal tape angle /2 ( '.") Toleance fo pecision olle beaing with /2 tape angle is +2"2" (JIS class and 2) Tageted toleance fo tape gage /2 is +9. Table. Examples of blue paste ecods Region A Region B Region C Region D SmallLage SmallLage SmallLage SmallLage Small: small diamete side Lage: lage diamete side Fig.. Regions subjected to measuement with blue paste

42 Technical Data 9 Running-in opeation fo main spindle beaings Run-in is impotant fo ensuing smooth opeation of gease-lubicated main spindle beaings. The following two modes of unning-in ae ecommended: () The beaing speed is gadually inceased in steps. Afte the tempeatue is satuated at each speed setting, the speed is inceased to the next step (Fig..). (2) The beaing is un fo seveal minutes up to about the maximum allowable speed limit of the beaing. This cycle is epeated two to thee times (Fig..) as needed. Method () takes moe time, although it involves less gease deteioation due to lowe tempeatue ise. In contast, Method (2) can shoten the unning-in time, although its stating phase involves a steep incease in beaing tempeatue, possibly deteioating the quality of the lubicant. The suppoting data fo the Methods () and (2) ae given in the ight. Geneally, the tempeatue of a main spindle beaing is measued on the font cove. The tempeatue diffeence acoss the beaing oute ing and font cove eaches 2 to C, and at the same time, the tempeatue diffeence between the hottest olling element and the inne ing aceway suface seems to each to C. Fo this eason, NTN ecommends that the machine is stopped if the tempeatue on font cove eaches appoximately C. The machine should be allowed to cool off befoe the unning-in opeation is estated. OR tempeatue OR tempeatue OR tempeatue 2 2 OR tempeatue Room tempeatue Speed 2 Timeh Fig OR tempeatue Room tempeatue 2 Speed 2 Timeh 2 Beaing Mounted peload Jacket cooling Beaing Mounted peload Jacket cooling S-CDLLBDB2 ows NFixed-position peload Yes S-2LA-BNS2LLBDB22 ows knconstant pessue peload Yes Beaing NN2HSK Mounted adial cleaance -m Jacket cooling Yes OR tempeatue Room tempeatue Speed 2 2 Timeh 2 Speedmin - Speedmin - Speedmin - Beaing NN2HSK Mounted adial cleaance -m Jacket cooling Yes OR tempeatue 2 OR tempeatue Room tempeatue Speed.. 2 Timeh 2 Speedmin - Fig..

43 Technical Data. Lubication of Beaings In a beaing, lubication foms a thin oil film on both olling and sliding sufaces to pevent metal-to-metal contact. The benefits of lubication can be summaized as follows: () Alleviation of fiction and wea (2) Removal of heat due to fiction () Longe beaing life () Rust pevention () Potection against contamination by foeign mateial high Tempeatue incease Tempeatue incease Oil volume Fig.. Fiction loss lage high Fiction loss To achieve the full lubicating effect, it is necessay to use a lubicating system suited to the opeating conditions, select a quality lubicant, emove dust fom the lubicant, and design an appopiate sealing stuctue to pevent contamination as well as lubicant leakage. The main spindle of a machine tool usually uses an extemely low volume of lubicant so heat geneation fom stiing of the lubicant is minimal. Fig.. summaizes the elationships between oil volume, fiction loss, and beaing tempeatue. The lubication methods available fo beaings in a machine tool include gease lubication, oil mist lubication, ai-oil lubication, and jet lubication. Each method has unique advantages. Theefoe, the lubicating system that best suits the lubication equiements should be used. Tables. and.2 summaize the featues of vaious lubication methods. Table.2 Evaluation of vaious lubicating systems Lubication method Citeion Gease lubication Oil mist lubication Ai-oil lubication Jet lubication Table. Oil volume, fiction loss and beaing tempeatue (Fig..) Zone Featues With an extemely low volume of oil, patial metal-to-metal contact occus between the olling elements and aceway suface, possibly leading to abnomal wea and beaing seizue. Typical lubication method Handling Reliability Tempeatue incease Cooling effect Sealing stuctue A unifom, uninteupted oil film is fomed. Fiction is minimal and beaing tempeatue is kept low. Gease lubication Oil mist lubication Ai-oil lubication Powe loss Even with a geate oil volume, heat geneation and cooling ae in balance. Ciculating lubication Envionmental contamination Allowable dmn value Tempeatue incease is constant egadless of oil volume. Ciculating lubication LegendExcellentGoodFaiPoo The pemissible dmn values ae appoximate values: dmn: pitch cicle diamete acoss olling elements [mm] multiplied by speed [min - ] A futhe incease in oil volume contibutes to a significant cooling effect, and the beaing tempeatue dops. Foced ciculating lubication Jet lubication 9

44 Technical Data Gease lubication Gease lubication is the most common, as it simplifies the main spindle stuctue moe than othe lubicating systems. With an adequate amount of quality gease pefilled, this system can be used ove a wide ange of speed. The allowable maximum speed vaies with the type and size of beaing: fo a highspeed angula contact ball beaing, the dmn value should be. as a guideline. Fo applications exceeding this ange, consult NTN Engineeing. Gease types A lithium-based gease, with a mineal oil base, is commonly used as a lubicant fo olling beaings. Its opeating tempeatue ange is - C to C. When the tempeatue incease must be limited, as with the main spindle of a machine tool, NTN ecommends the use of a synthetic-oil-based gease (dieste, dieste+mineal oil) which penetation is NLGI gade o 2. Table. lists technical data fo geases commonly used fo machine tool main spindles. Amount of gease equied Usually, a beaing fo the main spindle of a machine tool equies that gease volume be low so heat geneated by the stiing of the gease duing highspeed opeation is minimal. A guideline fo the amount of gease used fo a main spindle beaing is given below. Angula contact ball beaing (dmn value ); % of beaing fee space (dmn value ); 2% of beaing fee space Cylindical olle beaing; % of beaing fee space Tapeed olle beaing; % of beaing fee space The space in the beaing typically used fo main spindles ae listed in dimension tables. Detemine a fill amount by efeing to the elevant dimension table. Befoe filling a beaing with gease, emove the ustpoof coating fom the beaing with clean wash oil and allow the beaing to dy completely. Then fill and unifomly distibute an appopiate amount of gease in the beaing with an syinge, plastic bag, etc. Table. Typical geases fo machine tool main spindle beaings Gease band SE- MP- ISOFLEX NBU Stabllugs NBU EP Multemp LRL Multemp PS2 ISOFLEX LDS Thickene Uea Ba complex soap Li soap Base oil Este Synthetic oil Este Mineal oil Synthetic oil Dieste+mineal oil Synthetic oil Base oil viscosity ( C) mm 2 /S Dopping point C Opeating tempeatue ange C Application 2 Applied to ULTAGE Seies gease-lubicated sealed angula contact ball beaings Applied to ULTAGE Seies gease-lubicated sealed angula contact ball beaings Most commonly used fo main spindles Suitable fo olle beaings subject to lage loads Wide opeating tempeatue ange Excellent low tempeatue and fiction chaacteistics Suitable fo ball beaing NTN gease code L9 L K L 2K K K

45 Technical Data 2 Ai-oil lubication Ai-oil lubication (also known as oil-ai lubication o oil and ai lubication) is widely adopted fo main spindle beaings in ode to cope with the highe speed and pecision of machine tools and to ensue moe eliable lubication. Ai-oil lubication employs a method by which compessed ai is used to povide lubicating oil in pecisely contolled amounts. Geneally, an ai-oil lubication unit a volumetic piston-type distibuto that accuately metes the equied minimum amount of lubicating oil and povides it at optimal intevals contolled by a time. Special featues of ai-oil lubication Ai-oil lubication has the following advantages ove conventional oil mist lubication: Accuately supplies a minimal amount of oil. Can be adjusted to povide the pope amount of lubicant fo individual beaings. No limitations exist egading lubicant viscosity and exteme pessue additives. Compessed ai helps cool the beaing. Vaiations in the distance and height of lubication points do not affect lubication efficiency. Health hazads of oil mist ae minimized. Low oil consumption. Use of compessed ai can pevent contamination of the beaing by othe coolants. The ecommended oil viscosity is to 2 mm 2 /s. Example of an ai-oil lubication unit Fig..2 shows the stuctue of an ai-oil lubication unit. Ai Ai filte Solenoid valve (fo ai shut-off) Mist sepaato RV Ai-oil lubicating unit Pessue gauge Pump unit Time Pessue switch (ai) Pessue gauge Filte Pessue switch (oil) Mixing valuve Oil/ai Oil Oil egulating valve Ai-oil lubication nozzle space Ai-oil lubication equies a specialized nozzle because it supplies the lubicating oil to the inside of the beaing by means of compessed ai. (Fig..) A nozzle with a hole diamete of. to. mm and a length to times the hole diamete is ecommended. Beaing Space with nozzle Fig.. Feed system fo ai-oil lubication Exhaust method fo ai-oil lubication Ai-oil lubication uses a lage volume of ai to feed lubicating oil to the beaing. Theefoe, it is essential that the ai fed into the beaing be allowed to escape. If the ai is not smoothly exhausted, the lubicating oil will emain in the beaing and possibly contibute to beaing seizue. In the design stage, emembe to allow ample space on the exhaust side of the beaing in ode to incease exhaust efficiency and povide a lage oil dain hole to ensue smooth aiflow. In addition, fo types that allow fo epositioning of the spindle, it is ecommended that the shoulde dimensions of all pats is designed to pevent lubicating oil fom flowing back into the beaing afte a change in the attitude of the main spindle. Unnecessay dimensional diffeences can also contibute to stagnancy of the lubicating oil. PSW Oil level switch Fig..2 Ai-oil lubicating system

46 Technical Data Recommended tageted position with nozzle () Angula contact ball beaings Table. Ai-oil/oil mist nozzle space dimensions Note: Space dimensions ae the same fo all contact angles (, 2 and ). Table. Ai-oil/oil mist nozzle space dimensions Note: Space dimensions ae the same fo all contact angles (, 2 and 2 ). Beaing No. A Oute diamete of Inne diamete of inne ing space oute ing space D E 9U 9U 92U 9U 9U 9U 9U 9U 9U 99U 9U 9U 92U 9U 9U 9U 9U 9U 9U 99U 92U 92U 922U 92U 92U U U 2U U U U U U U 9U U U 2U U U U U U U 9U 2U 2U 22U 2U 2U Beaing No. HSE9U HSE9U HSE92U HSE9U HSE9U HSE9U HSE9U HSE9U HSE9U HSE99U HSE92U HSE92U HSE922U HSE92U HSE92U HSE92U HSE9U HSE92U HSE9U HSE HSE HSE2 HSE HSE HSE HSE HSE HSE HSE9 HSE2 HSE2 HSE22 HSE2 HSE2 HSE2 HSE HSE2 HSE Oute diamete of Inne diamete of A inne ing space oute ing space D E

47 Technical Data E A D Fig.. U, HSE, BNT and HTA types Table. Ai-oil/oil mist nozzle space dimensions Table. Ai-oil/oil mist nozzle space dimensions Note: Space dimensions ae the same fo all contact angles ( and ). Beaing No. BNT9 BNT9 BNT92 BNT9 BNT9 BNT9 BNT9 BNT9 BNT9 BNT99 BNT BNT BNT2 BNT BNT BNT BNT BNT BNT BNT9 BNT2 BNT2 BNT22 BNT2 BNT2 BNT2 BNT2 BNT2 BNT2 BNT29 Oute diamete of Inne diamete of A inne ing space oute ing space D E Beaing No. HTA92 HTA92 HTA922 HTA92 HTA92 HTA92 HTA9 HTA92 HTA9 HTA9 HTA9 HTA9 HTA HTA HTA HTA9 HTA HTA HTA2 HTA HTA HTA HTA HTA HTA HTA9 HTA2 HTA2 HTA22 HTA2 HTA2 HTA2 HTA HTA2 HTA Oute diamete of Inne diamete of A inne ing space oute ing space D E

48 Technical Data (a) When lubicant is supplied between the cage and inne ing E (b) When lubicant is supplied between the cage and oute ing E A D C B D Fig.. C, 9C, C and 2C types Table. Ai-oil/oil mist nozzle space dimensions Beaing No. C C C C 9C C C 2C C C C C C C 9C 2C 2C 22C 2C 2CT 2CT CT 2CT CT (b) When lubicant is supplied between the cage and oute ing Oute diamete of Inne diamete of B C inne ing space oute ing space D E CTB 9CTB 92CTB 9CTB

49 Technical Data CCT92CTB9CTB2C2C B is ecommended. 2CTBCTB29C22C A is ecommended. If tageting at A is impossible, B is acceptable. If both A and B ae impossible, tageting fom C is acceptable. Table.9 Ai-oil/oil mist nozzle space dimensions Beaing No. 2C 2C 22C 2C 2C 2C 2C 2C 2C 29C 2C 2C 22C 2C 2C 2C 2C 2C 2C 29C 22C 22C 222C 22C 22C (a) When lubicant is supplied between the cage and inne ing (b) When lubicant is supplied between the cage and oute ing Common to (a) & (b) A Oute diamete of inne ing space Inne diamete of oute ing space B C Oute diamete of Inne diamete of inne ing space oute ing space D E CTB CTB 2CTB CTB CTB CTB CTB

50 Technical Data (2) Cylindical olle beaings E E E C D B D A D Fig.. NN and NNT types Fig.. NHS type Table. Table. Beaing No. C Oute diamete of Inne diamete of inne ing space oute ing space D E NN NN NN NN NN9 NN NN NN2 NN NN NN NN NN NN NN9 NN2 NN2 NN22 NN2 NN2 NN2 NN NN2 NN NN NN (9) 9 2 () (2) (2) NOTE) With cetain poducts, the dimension C of L cage diffes fom that of T cage. The values in paentheses ( ) ae dimensions C of L cages. Othe dimensions of L cages ae same as those of T cages. Beaing No. NHS NHS NHS N9HS NHS NHS N2HS NHS NHS NHS NHS NHS NHS N9HS N2HS N2HS N22HS N2HS N2HS N2HS NHS N2HS Oute diamete of Inne diamete of A B inne ing space oute ing space D E E A D Fig.. NHSR type Table.2 Beaing No. N HSRT N2 HSRT N HSRT N HSRT N HSRT N HSRT N2 HSRT A Oute diamete of inne ing space Inne diamete of oute ing space D E

51 Technical Data Jet lubication With this lubicating system, a high-speed jet of lubicant is injected into the beaing fom the side. This is the most eliable lubicating technique and is typically used on the main spindle beaings of jet engines and gas tubines. It is cuently capable of a dmn value of up to appoximately.. When used as a lubicating system fo the main spindle of a machine tool, it can minimize the tempeatue incease of the beaing. Howeve, the esultant toque loss is geat, as a lage amount of oil is supplied to each beaing. Theefoe, this aangement equies a poweful moto to dive the main spindle. Low viscosity oil (2- mm 2 /s) is used. Fig..9 shows examples of the tempeatue incease with ai-oil lubication and jet lubication, while Fig.. gaphically plots test esults of powe loss. Beaing : 2LA-HSE2, boe mm, outside diamete mm Rolling element : Beaing steel Beaing : 2LA-HSE2, boe mm, outside diamete mm Rolling element : Beaing steel Tempeatue incease on oute ing C 2 Ai-oil (Oil volume:. ml/min, ai: NL/min) Jet (Oil volume:.l/min) Powe loss kw / beaing 2 2 Speed min - Jet (Oil volume:.l/min) Ai-oil (Oil volume:. ml/min ai: NL/min) Speed min dmn value Fig.. Compaison of powe loss with ai-oil lubication and with jet lubication dmn value Fig..9 Compaison of tempeatue incease of oute ing with ai-oil lubication and jet lubication (The tempeatue incease with ai-oil lubication is elative to oom tempeatue; the tempeatue with jet lubication is elative to lubicant tempeatue.)

52 Technical Data. New Technologies The new ULTAGE Seies of supehigh-speed pecision beaings fo machine tool main spindles NTN has esponded to need fo impoved efficiency, eliability, quality and envionmental esponsibility fo machine tools by developing the ULTAGE Seies of supe-high-speed pecision beaings. This new line of beaings demonstates excellent pefomance thanks to the optimal intenal design; a new appoach to suface quality; and the use of special mateials, special gease, and seals on both sides. "ULTAGE" is a new wod coined by combining Ultimate and Stage to stand fo NTN s wish to ealize the ultimate level of pecision beaing design. Fom low-speed heavy-duty machining to high-speed light -duty machining Impoved duability 2 New mateial and new suface modification technology The ULTAGE supe high-speed pecision beaing seies fo machine tool main spindles employs a special mateial that boasts excellent anti-seizue popeties and wea esistance, as well as a unique suface modification technique. Life unde nomal tempeatues The test esults obtained fom point contact test pieces unde geate loading ae gaphically plotted in Fig... Test conditions Test piece Ball Max. contact stess Loading fequency Lubicant 222 mm cylindical olle 9./". GPa,2 cycles/min Tubine VG (oil bath) Schematic of test ig Ball Impoved oundness with wok pieces Meets ISO Test piece Concept Ou ideal is to offe a supe high-speed pecision beaing that offes excellent eliability while emaining eco-fiendly. Design The intenal beaing design has been optimized to cope with vaying applications and opeating conditions in ode to ealize high speed and high igidity, limited tempeatue incease, high pecision, enegy saving and low noise emission. It pefoms optimally in a vaiety of situations. Mateial Adoption of special mateial and a special suface modification technique has esulted in geatly enhanced eliability. Lubication Use of unique eco-conscious technology and special gease contibutes to deceased pollution and enhanced enegy savings. Pecision Ou supe high-pecision technology, in conjunction with ou poven pecision beaing technology, will help attain futhe impoved pecision. Cumulative pobability of failue (%) 99 2 SUJ2 Special mateial No flaking 9 SUJ2 Special mateial LifeLoading Cycle L ( cycles). 9. Life atio 2. The olling fatigue life of the special mateial is appoximately times as long as that of SUJ2. Fig.. Life test esults with point contact test pieces

53 Technical Data Life unde high tempeatue The test esults obtained fom thust-type test pieces at 2 C ae gaphically plotted in Fig..2. Impoved wea esistance Test esults with a Sawin type fiction and wea test machine ae illustated in Fig... Test conditions Test piece Ball Max. contact stess Loading fequency Oil tempeatue Lubicant Schematic of test ig 29t flat plate./"ceamic ball. GPa, cycles/min 2 C Ethe-based oil Test conditions Speed Peipheal speed Test duation Max. contact stess Lubicant Rotating test piece Fixed test piece min - m/s min 2. GPa VG2 Mateial being tested SiN Schematic of test ig Rotating test piece Fixed test piece Special mateial 2 - mm Ceamic ball SUJ2 - mm Cumulative pobability of failue (%) 99 2 SUJ2 Special mateial No flaking SUJ2 Special mateial Life (loading cycles) L ( cycles) 9. No flaking Test piece (flat plate) Life atio Amount of wea The wea esistance of the special mateial is times bette than that with SUJ2. Fig.. Test esults with Sawin type fiction and wea test machine Impoved anti-seizue popety Test esults with a two olle testing machine ae illustated in Fig... Test conditions Diving side speed Diven side speed Sliding velocity Max. contact stess Lubicant Diving olle Diven olle 2 min - 2 min -. m/s 2.9 GPa VG2 Mateial being tested Mateial being tested Schematic of test ig Diven olle Diving olle The olling fatigue life of the special mateial at a high tempeatue of 2 C is moe than times as long as that of SUJ2. Special mateial min o longe Fig..2 High tempeatue life test esults with thusttype test pieces SUJ2 2min Duation The anti-seizue popety of the special mateial is moe than times bette than as that with SUJ2. Fig.. Test esults with a two olle testing machine 9

54 Technical Data Adoption of ceamic balls A compaison of tempeatue incease, which can vay depending on the mateial of olling element, is illustated in Fig... Test conditions Test beaing Peload Lubication Oute casing cooling Basic beaing numbe HSE2 22 ows) 2. kn (constant pessue peloading) Gease None Envionmentally conscious technology The eco-fiendly ULTAGE Seies is available in two specifications: an eco-fiendly ai-oil lubication design that offes enegy savings by educing ai and oil consumptions; and a gease-lubicated, sealed design that educes envionmental impact by employing a gease lubication system that is capable of highespeed opeation. Tempeatue incease of oute ing C 2 Shaft speedmin dmn value Steel balls Ceamic balls Requied functions fo the main spindle beaing Speed Rigidity Duability Pecision Fo main spindles Eco-fiendly ai-oil lubication Eco-fiendly design The ULTAGE seies beaings employ well-poven ceamic balls to efficiently limit tempeatue incease. HSL type NHSL type Fig.. Compaison of tempeatue incease with steel and ceamic olling elements Reduced ai/oil consumption contibutes to enegy savings. High-speed BNS LLB type Gease lubication Standad /9AD, CD LLB type NHSRT type Sealed Sealed The intoduction of a gease lubication system that is capable of high-speed opeation educes the envionmental impact. Fo ball scew suppot Gease lubication 2A-BST LXL type 2A-BST type Sealed Combines duability with ease of handling. Duability

55 Technical Data Gease-lubicated sealed angula contact ball beaings () Ease of handling ULTAGE angula contact ball beaings with seals ae gease-pefilled beaings. No gease filling is necessay; you need only wipe off the ust-peventive oil befoe assembly. Seals of diffeent colos ae employed to diffeentiate the font and back. The black font face and oange back face ae easily identified, which also makes it easy to oient the beaings in combinations (Table.). Table. Beaing combinations and seal colos DB set (back-to-back) DF set (face-to-face) Oange seal Oange seal Black seal Black seal (2) Suggestions fo simplified spindle stuctue The ULTAGE Seies sealed angula contact ball beaing makes possible high-speed opeation with gease lubication thanks to optimized intenal design. Gease lubication with minimal mist splash simplifies main spindle stuctue and contibutes to lowe envionmental impact as well as cost eduction (Fig..). Ai-oil lubication Gease lubication Simplifies the main spindle stuctue and educes both the initial cost and opeating cost. Fig.. Alteation to lubication system (ai-oil lubication to gease lubication)

56 Technical Data Eco-fiendly ai-oil lubicated angula contact ball beaings and cylindical olle beaings When combined with the eco-fiendly nozzle, the ecofiendly ai-oil lubicated angula contact ball beaing (HSL/HSFL Seies) o cylindical olle beaing (NHSL[K] Seies) can educe the emissions of oil mist and noise. () Reduction of oil mist The eco-fiendly ai-oil lubicated beaing does not spay compessed ai fom the nozzle; instead, it uses the centifugal foce of the otating inne ing to supply lubicating oil into the beaing. Fo this eason, this type of beaing conseves both ai and oil. In addition, it educes the amount of oil mist emitted fom the labyinth seal of the spindle. The following photogaphs eveal the diffeence between the amount of oil mist emitted fom the conventional standad beaing and that emitted fom the eco-fiendly beaing. The lubicating oil dischaged with ai passes though the inside of the beaing and is then exhausted as a lage volume of mist. The lubicating oil exhausted fom the beaing in the mist state is collected though the dischage pot of the main spindle housing, but some of the oil mist leaks fom the main spindle labyinth seal and contaminates the immediate envionment aound the machine. Adoption of the eco-fiendly beaing theefoe impoves the woking envionment. Standad beaing Eco-fiendly beaing design Ai-oil Ai-oil Eco-fiendly nozzle Standad nozzle Lubicating oil supplied with a lage quantity of ai 2LA-HSE type A small amount of lubicanting oil is supplied 2LA-HSL Type Lubicating oil supplied though centifugal foce Conventional beaings consume a geat deal of ai when supplying lubicating oil to the beaing. The eco-fiendly type uses centifugal foce to supply lubicating oil into the beaing. Standad beaing Eco-fiendly beaing design Inne ing Atomized when emitted fom the nozzle The oil emitted fom the nozzle is in a liquid state. Standad beaing Eco-fiendly beaing design A lage amount of oil mist passes though the beaing, contaminating the woking envionment. The amount of oil mist is educed, minimizing envionmental contamination in wok aeas. 2

57 Technical Data (2) Noise Reduction The standad ai-oil lubication method uses ai to supply a slight amount of oil. It also uses a special nozzle space, as shown in Figs.. and.9. In addition, this method uses a nozzle measuing to. mm in diamete to supply oil to the aceway suface of the beaing at the ate of to NL/min/beaing. To supply this oil, the nozzle emits compessed ai as a jet to beak the ai baie of the beaing, which is ceated when unning at high speed. In this way, the ai is used as a tool fo supplying oil. The eco-fiendly beaing developed by NTN educes the amount of ai consumed, thus educing the whistling noise of the flowing ai. The mechanism used in this type of beaing is as follows: the centifugal foce of the beaing inne ing feeds a small amount of oil fom the nozzle to the aceway suface of the beaing along the tapeed suface. (Figs.. and.). Ai-oil Since the function of the compessed ai is only to delive lubicating oil to the cavity of the inne ing, a lage quantity of ai is not equied. In addition, since the ai used to supply the oil is eleased between the tapeed sufaces, the whistling noise of ai is also educed. When the eco-fiendly beaing is employed, the noise is educed by to dba. Example: In the high-speed egion in excess of, min -, noise is educed by to dba (Fig..). Test conditions Test beaing Shaft speed Peload S-2LA-HSFL2 (eco-fiendly beaing) S-2LA-HSF2 (22 ows) 2, min - 2. kn (constant pessue peloading) Fig.. Standad nozzle Ai-oil Eco-fiendly nozzle Intenal specification of HSE type Eco-fiendly specification Fig.. Eco-fiendly type nozzle Noise valuedba 2 9 HSFL type HSF type 2 Shaft speedmin dmn value Fig.. Compaison of noise values Ai-oil Fig..9 Cuent beaing NHS type The eco-fiendly beaing is paticulaly good fo educing sceeching noise. The high-fequency component of the noise geneated at high speeds is well attenuated. The eason fo this is as follows: when the ai jet emitted fom the standad nozzle hits the olling elements, a high-pitched noise is geneated; in contast, the eco-fiendly nozzle does not emit ai on the olling elements, which educes sceeching noise. Ai-oil Eco-fiendly nozzle Intenal specification of NHSR type Eco-fiendly specification MAG dbv 2 db/ - Hz BeaingS-HSC2 Numbe of balls Shaft speed, min - PWR SP A han LIN kh Fig.. ULTAGE NHSL type Fig..2 Fequency chaacteistics of beaing noise (standad nozzle)

58 NTN Main Spindle Beaings

59 NTN Main Spindle Beaings Main Spindle Beaings 9. Angula Contact Ball Beaings fo Radial Loads CONTENTS 9. Angula Contact Ball Beaings fo Radial Loads 2 q Featues of vaious types w Standad cage design e Beaing designations Beaing accuacy t Intenal cleaance and standad peload of duplex angula contact ball beaings 2 y Recommended fit fo angula contact ball beaings u Duplex angula contact ball beaings i Duplex aangement codes of duplex angula contact ball beaings9 o Flush ginding and univesal matching 9! Angula contact ball beaings with ceamic balls! Opeating life of beaings with ceamic balls!2 Recommended lubication specifications 2! Standad angula contact ball beaings 9U and U types! High-speed angula contact ball beaings HSE type! Supe high-speed angula contact ball beaings HSF type! Eco-fiendly ai-oil lubicated angula contact ball beaings HSL type HSFL type! Gease-lubicated sealed standad angula contact ball beaings 9LLB/LLB types, S-9LLB/LLB types! Gease-lubicated sealed angula contact ball beaings BNS type S-BNS type!9 Dimension table Standad angula contact ball beaing 2 High-speed angula contact ball beaings Supe high-speed angula contact ball beaings Eco-fiendly high-speed angula contact ball beaings Eco-fiendly supe high-speed angula contact ball beaings Gease-lubicated sealed standad angula contact ball beaings Gease-lubicated sealed high-speed angula contact ball beaings Angula contact ball beaings fo motos and lathes 9

60 NTN Main Spindle Beaings 9. Angula Contact Ball Beaings fo Radial Loads Angula contact ball beaings fo adial loads used in machine tools ae beaings which inne and oute ings cannot be sepaated. This type of beaing includes seies, 9U, U, 2, HSE9, HSE, BNS9, BNS, BNT9, BNT and BNT2. Fo angula contact ball beaings, an imaginay staight line connecting the contact points between the balls and inne and oute ings foms an angle with the adial axis. The optimal contact angle can be selected to meet functional equiements such as high speed o high igidity. The available contact angles ae (contact angle symbol "C"), 2 (no symbol), 2 ("AD"), and (no symbol). (Fig. 9.) Contact angle High-speed angula contact ball beaings (HSE type) High-speed angula contact beaings ae available in two types: HSE9 and HSE. The bounday dimensions of this beaing seies ae detemined accoding to the JIS dimension seies (9, ), and thee types of contact angles ae available: (contact angle symbol "C"), 2 (no symbol), and 2 ("D"). The accuacy of this ball beaing seies is JIS class o bette, and the ball diamete is smalle than that of the standad angula contact ball beaing in ode to accommodate high speeds. The oute suface of the inne ing and the boe of the oute ing ae elieved on one side, and this beaing seies employs an ai-oil lubication system to ensue smooth oil flow. In addition, it employs special mateials, and its suface is modified to potect the beaing fom wea and seizue moe positively. The HSE type beaing is available with eithe steel balls o ceamic balls. Fig. 9. Contact angle Featues of vaious types HSEC HSE9C Open beaings Standad angula contact ball beaings (, 9, and 2 Types) Standad angula contact ball beaings ae available in fou types:, 9, and 2. Types 9 and include the 9U and U ULTAGE Seies, which accommodate high speed and low tempeatue ise with optimized specifications of the intenal design. Fo these types, thee contact angles ae available: (contact angle symbol "C"), 2 ("AD"), and (no symbol). The contact angle of 2, howeve, is also available with 9U and U types. This beaing seies has an accuacy of JIS class o bette. The featues include high speed, high igidity, and high load capacity. Some models incopoate ceamic balls. Fig. 9. High-speed angula contact ball beaings Ulta-high-speed angula ceamic ball beaings (HSF type) The HSF type ulta-high-speed angula contact ceamic ball beaing employs smalle balls than the HSEC type to ensue igidity and pevent tempeatue ise. In addition, it employs a contact angle of 2 to accommodate the eduction in contact angle caused by centifugal foce duing opeation. These featues allow the use of an ai-oil lubication system (dmn value 2. ) in a speed egion that was peviously possible only with a conventional jet lubication system. 2C UC 9UC C Fig Standad angula contact ball beaings Fig. 9. Ulta-high-speed angula contact ball beaings

61 NTN Main Spindle Beaings Eco-fiendly ai-oil lubicated angula ball beaings (HSL and HSFL types) Fo eco-fiendly ai-oil lubicated angula contact ball beaings (HSL and HSFL types), the angle of the inne ing oute suface (counteboe aea) is optimized compaed with that of HSE and HSF types. In addition, these angula contact ball beaings ae dedicated to aioil lubication by adopting a cicumfeential goove and an eco-fiendly nozzle. They accommodate the same high speed as HSE and HSF types while being moe eco-fiendly. They geneate less noise and conseve enegy since they consume less ai and oil. The accuacies of these beaing types ae JIS class o bette. Fo the HSL type, thee contact angles [ (contact angle symbol "C"), 2 (no symbol), and 2 ("AD")] ae available. Fo the HSFL type, howeve, only one contact angle (2 ) is available. The HSFL type utilizes a specially designed eco-fiendly nozzle. Sealed beaings Standad gease-lubicated sealed angula contact ball beaings (9LLB/LLB types) The standad gease-lubicated sealed angula contact ball beaings ae available in 9 and seies. Non-contact ubbe seals ae mounted on both sides and special gease is used. As a esult, these beaings accommodate high speed, offe polonged sevice life, and help to maintain a comfotable woking envionment. These beaings ae available in contact angles of (contact angle symbol "CD") and 2 ("AD") and with a special accuacy of P2 (JIS class dimensional accuacy and JIS class 2 unning accuacy). Since they ae pefilled with gease, these beaings equie no cleaning befoe use and ae theefoe easy to handle. They ae available with eithe steel balls o ceamic balls. Back side Font side HSL type HSFL type Fig. 9. Standad gease-lubicated sealed angula contact ball beaings Fig. 9. Eco-fiendly angula contact ball beaings High-speed angula contact ball beaings fo ginding machines/motos (BNT type) The bounday dimensions of high-speed angula ball beaings fo ginding machines/motos (BNT type) ae detemined accoding to the JIS dimension seies (9,, 2). Fo this beaing type, only one contact angle (, no symbol) is available, and the beaing accuacies ae JIS class o bette. This beaing uses mainly ai-oil lubication and oil mist lubication. The featues of this beaing ae high speed capability and high load capacity. This type of beaing is available with eithe steel balls o ceamic balls. High-speed gease-lubicated sealed angula contact ball beaings (BNS type) High-speed gease-lubicated sealed angula contact ball beaings (BNS type) ae available with the bounday dimensions of HSE type. Non-contact ubbe seals ae incopoated on both sides and its inne stuctue is optimized. It is also pefilled with a special gease to achieve high speed capability, inhibit tempeatue ise, extend sevice life and ceate a comfotable woking envionment. This beaing type is available in contact angles of (contact angle symbol "CD"), 2 (no symbol), and 2 ("AD"). Beaing accuacy is JIS class o bette. The beaing ing is made of a special mateial, and the suface is modified to potect the beaing fom wea and seizue. Since this type is pefilled with gease, it equies no cleaning befoe use and is theefoe easy to handle. It is available with eithe steel balls o ceamic balls. Back side Font side BNT2 BNT BNT9 Fig. 9. High-speed angula contact ball beaings fo ginding machines/motos Fig. 9. High-speed gease-lubicated sealed angula contact ball beaings

62 NTN Main Spindle Beaings 2 Standad cage design Table 9. Standad cages of angula contact ball beaings fo adial loads Beaing seies Molded nylon cage Machined phenol esin cage Machined high tensile bass cage C 9U (, 2, ), 9C U (, 2, ), C 2C HSE9 (, 2, 2 ) HSE (, 2, 2 ) HSF HSL9 (, 2, 2 ) HSL (, 2, 2 ) HSFL 9 LLB (, 2 ) LLB (, 2 ) BNS9 (, 2, 2 ) BNS (, 2, 2 ) BNT9 BNT BNT2 9U 92U U 2U 2C 22C 9 LLB 99 LLB LLB 9 LLB C 2C 22C 22C HSE9 HSE9 HSE HSE HSF HSF2 HSL9 HSL9 HSL HSL HSFL HSFL2 BNS9 BNS92 BNS BNS2 BNT9 BNT99 BNT BNT9 BNT2 BNT29 Note: Cage design is subject to change without notice. Fo detailed infomation, contact NTN Engineeing. 2C C 92C 9C 2C C 22C Beaing designations, 9,, 2, BNT type S- 2 U C T DB /GL P Pecision class P: JIS class, P: JIS class, P2: JIS class 2 Intenal cleaance code GL: Light peload, GN: Nomal peload, GM: cental peload, Gxx: Special peload, CSxx: Special cleaance Matching code DB: Back-to-back (double-ow) DT: Tandem (double-ow) DTBT: Tandem back-to-back (quad-ow) Cage code No code: Standad cage T: Machined phenol esin cage T2: Molded polyamide esin cage L: Machined high tensile bass cage Contact angle code C:, AD: 2, No symbol: 2 Beaing seies (ULTAGE Seies) Boe diamete code (See dimension table) Dimension seies code Beaing type Mateial code S: Ceamic olling elements No code: Steel olling elements

63 NTN Main Spindle Beaings HSE type S- 2LA-HSE 2 AD T2 DB /GL P Contact angle code C:, AD: 2, No symbol: 2 Boe diamete code (See dimension table) Dimension seies code Beaing type 2LASpecial mateial with impoved suface teatment HSL type S- 2LA-HSL 2 DB +xx Dn /GL P +TKZ noteshslbeaing seies code xxdneco-fiendly nozzle, o Space with Eco- fiendly nozzle located between beaings TKZEco-fiendly nozzle, o Space with Eco- fiendly nozzle located beside beaings Spacecode Locatedbesidebeaings Spacecode Locatedbetweenbeaings Spacewidthdimension Beaing type 9LLB / LLB type S- CD LLB DB /GL P2 /L9 Accuacy class P2: Dimensional accuacy = JIS class, unning accuacy = JIS class 2 Beaing type (ULTAGE Seies) CD : Contact angle AD : Contact angle 2 BNS type S- 2LA-BNS 2 LLB DB /GL P /L9 Gease code /L : Special gease MP- /L9 : Special gease SE- Seal code LLB: Non-contact ubbe seal on both sides Beaing type 9

64 NTN Main Spindle Beaings Beaing accuacy Table 9.2 Inne ings Nominal boe diamete d Single plane mean boe diamete deviation Δdmp Class Class Class 2 ove incl. high low high low high low Single adial plane boe diamete vaiation Vdsp Diamete seies 9 Diamete seies, 2 Class Class Class 2 Class Class Class 2 max max Mean boe diamete deviation Vdmp Class Class Class 2 max Inne ing adial unout Kia Class Class Class 2 max The toleance of boe diamete deviation Δds, applicable to classes and 2, is the same as the toleance of mean boe diamete deviation Δdmp. This applies to the diamete seies o 2 fo class, and all the diamete seies fo class 2. 2 Applicable to individual beaing ings manufactued fo duplex beaings Table 9. Oute ings Nominal outside diamete D Single plane mean outside diamete deviation ΔDmp Class Class Class 2 ove incl. high low high low high low Single adial plane outside diamete vaiation VDsp Diamete seies 9 Diamete seies, 2 Class Class Class 2 max 9 9 Class Class Class 2 max Mean single plane outside diamete vaiation VDmp Class Class Class 2 max Oute ing adial unout Kea Class Class Class 2 max The toleance of outside diamete deviation ΔDs, applicable to classes and 2, is the same as the toleance of mean outside diamete deviation ΔDmp. This applies to the diamete seies o 2 fo class, and all the diamete seies fo class 2.

65 NTN Main Spindle Beaings Pependiculaity of inne ing face with espect to the boe Sd Class Class Class 2 max Axial unout Sia Width deviation ΔBs Duplex Single beaing beaing 2 Class Class Class 2 Class Class Class 2 Class Class max high low high low high low Width vaiation VBs Unit: Class Class Class 2 max Pependiculaity of oute ing outside suface with espect to the face SD Class Class Class 2 max Axial unout Sea Class Class Class 2 max Width deviation ΔCs All types Unit: Width vaiation VCs Class Class Class 2 max Identical to of ΔBs elative to d of the same beaing

66 NTN Main Spindle Beaings Intenal cleaance and standad peload of duplex angula contact ball beaings The initial intenal cleaance o peload fo duplex angula contact ball beaings is detemined with consideation fo two factos: tempeatue ise duing opeation and the igidity and accuacy equied afte assembly o duing opeation. The intenal cleaance of the beaing may be significantly affected duing opeation due to thee factos: the eduction in cleaance caused by fits, the tempeatue diffeence between the inne and oute ings duing opeation, and the effects of centifugal foce. Depending on the initial intenal cleaance, a significantly educed cleaance may esult in exteme tempeatue ise, vibation, noise, and shot sevice life. In addition, seizue may esult in some cases. Fo this eason, it is impotant to detemine the optimal initial intenal cleaance and initial peload equied fo opeation. When using a duplex angula contact ball beaing on the main spindle of a machine tool, the peload is detemined by consideing the type, main spindle configuation, lubication system, dive system, intended functions, and othe factos. Howeve, peload can also be genealized by the dmn value (dmn: pitch cicle diamete acoss olling elements [mm] multiplied by speed [min - ]), as shown below: dmn Nomal peload (GN) dmn Light peload (GL) dmn to positive cleaance Fo detailed infomation, contact NTN Engineeing. Table 9. Radial intenal cleaance of duplex angula contact ball beaings Unit:m Nominal boe diamete d C C2 CN (nomal) ove incl. min max min max min max Fo duplex angula contact ball beaings, NTN ecommends the initial adial cleaances and standad peloads shown in Tables 9. though 9.9. Select the optimal adial intenal cleaance and initial peload fo you application. When odeing a duplex angula ball beaing, please specify the desied peload and cleaance. If these ae not specified in the ode, we will ship a beaing with standad cleaance. Howeve, some poduct types do not have a standad cleaance. In this case, we will infom you of the available cleaances. Standad peloads of angula contact ball beaings (DB and DF aangements) Table 9. Standad angula contact ball beaings (C type) Unit: N Nominal boe diamete Contact angle: xxc d Light peload (GL) Nomal peload (GN) Medium peload (GM)

67 NTN Main Spindle Beaings Table 9. Standad angula contact ball beaings (9 seies) Nominal boe Contact angle: Contact angle: 2 diamete 9xxUC/S-9xxUC 9xxUAD/S-9xxUAD d Light peload Nomal peload Medium peload Light peload Nomal peload Medium peload (GL) (GN) (GM) (GL) (GN) (GM) Light peload (GL) Contact angle: 9xxU/S-9xxU Nomal peload (GN) Unit: N Medium peload (GM) xxC

68 NTN Main Spindle Beaings Table 9. Standad angula contact ball beaings ( seies) Nominal boe diamete d Light peload (GL) Contact angle: xxuc/s-xxuc Nomal peload (GN) xxc Medium peload (GM) Light peload (GL) Contact angle: 2 xxuad/s-xxuad Nomal peload (GN) Medium peload (GM) Light peload (GL) Contact angle: xxu/s-xxu Nomal peload (GN) Medium peload (GM) Unit: N Table 9. Standad angula contact ball beaings (2C seies) Unit: N Nominal boe Contact angle: diamete 2xxC d Light peload Nomal peload Medium peload (GL) (GN) (GM)

69 NTN Main Spindle Beaings Table 9.9 High-speed angula contact ball beaings (HSE9 seies) Unit: N Nominal boe Contact angle: Contact angle: 2 Contact angle: 2 diamete HSE9xxUC/S-HSE9xxUC HSE9xxU/S-HSE9xxU HSE9xxUAD/S-HSE9xxUAD d Light peload Nomal peload Medium peload Light peload Nomal peload Medium peload Light peload Nomal peload Medium peload (GL) (GN) (GM) (GL) (GN) (GM) (GL) (GN) (GM) Table 9. High-speed angula contact ball beaings (HSE seies) Unit: N Nominal boe Contact angle: Contact angle: 2 Contact angle:2 diamete HSExxC/S-HSExxC HSExx/S-HSExx HSExxAD/S-HSExxAD d Light peload Nomal peload Medium peload Light peload Nomal peload Medium peload Light peload Nomal peload Medium peload (GL) (GN) (GM) (GL) (GN) (GM) (GL) (GN) (GM)

70 NTN Main Spindle Beaings Table 9. Eco-fiendly ai-oil lubicated angula contact ball beaings (HSL9 seies) Nominal boe diamete d Light peload (GL) Unit: N Contact angle: Contact angle: 2 Contact angle: 2 S-HSL9xxUC S-HSL9xxU S-HSL9xxUAD Nomal peload Medium peload Light peload Nomal peload Medium peload Light peload Nomal peload Medium peload (GN) (GM) (GL) (GN) (GM) (GL) (GN) (GM) Table 9.2 Eco-fiendly ai-oil lubicated angula contact ball beaings (HSL seies) Nominal boe diamete d Light peload (GL) Contact angle: Contact angle: 2 Contact angle: 2 S-HSLxxC S-HSLxx S-HSLxxAD Nomal peload Medium peload Light peload Nomal peload Medium peload Light peload Nomal peload (GN) (GM) (GL) (GN) (GM) (GL) (GN) Medium peload (GM) Unit: N Table 9. Gease-lubicated sealed angula contact ball beaings (9CD and AD seies) Unit: N Nominal boe Contact angle: Contact angle: 2 diamete 9xxCD/S-9xxCD 9xxAD/S-9xxAD d Light peload Nomal peload Medium peload Light peload Nomal peload Medium peload (GL) (GN) (GM) (GL) (GN) (GM) Table 9. Gease-lubicated sealed angula contact ball beaings (CD and AD seies) Unit: N Nominal boe Contact angle: Contact angle: 2 diamete xxcd/s-xxcd xxad/s-xxad d Light peload Nomal peload Medium peload Light peload Nomal peload Medium peload (GL) (GN) (GM) (GL) (GN) (GM)

71 NTN Main Spindle Beaings Table 9. High-speed gease-lubicated sealed angula contact ball beaings (BNS9 seies) Unit: N Nominal boe Contact angle: Contact angle: 2 Contact angle: 2 diamete d Light peload Nomal peload Medium peload Light peload Nomal peload Medium peload Light peload Nomal peload Medium peload (GL) (GN) (GM) (GL) (GN) (GM) (GL) (GN) (GM) Table 9. High-speed gease-lubicated sealed angula contact ball beaings (BNS seies) Unit: N Contact angle: Contact angle: 2 Contact angle: 2 BNSxxC/S-BNSxxC BNSxx/S-BNSxx BNSxxAD/S-BNSxxAD Nominal boe diamete d Light peload (GL) Nomal peload (GN) Medium peload (GM) Light peload (GL) Nomal peload (GN) Medium peload (GM) Light peload (GL) Nomal peload (GN) Medium peload (GM) Table 9. High-speed sealed angula contact ball beaings (BNT9 seies) Nominal boe diamete d Light peload (GL) Table 9. High-speed sealed angula contact ball beaings (BNT seies) Table 9.9 High-speed sealed angula contact ball beaings (BNT2 seies) Unit: N Unit: N Unit: N Contact angle: BNT9xx/S-BNT9xx Nominal boe diamete Contact angle: BNTxx/S-BNTxx Nominal boe diamete Contact angle: BNT2xx/S-BNT2xx d d Nomal peload (GN) Medium peload (GM) Light peload (GL) Nomal peload (GN) Medium peload (GM) Light peload (GL) Nomal peload (GN) Medium peload (GM)

72 NTN Main Spindle Beaings Recommended fit fo angula contact ball beaings If the dmn value is in the ange of dmn (dm: pitch cicle diamete acoss olling elements [mm], n: speed [min - ]), the fit values shown in Tables 9.2 and 9.2 ae ecommended to ensue high accuacies of pecision beaings. If the dmn value is in the ange of dmn, it is necessay to conside expansion of inne ing caused by centifugal foce. In this case, contact NTN Engineeing fo the ecommended fit. As fo the fit of the oute ing with the housing, conside the influence of the ambient tempeatue (such as heat buildup on a built-in moto o the cooling effect of jacket). Fo technical assistance, contact NTN Engineeing. Table 9.2 Shaft fit Nominal boe diamete d Ove 2. Incl. 2 Fit of inne ing with shaft 2T 2T 2T T TT TT Unit: Duplex angula contact ball beaings Duplex angula contact ball beaings can be combined in ows of two, thee o fou beaings to accommodate equied specifications. The back-to-back duplex (DB) aangement and the face-to-face duplex (DF) aangement allow fo the application of both adial loads and axial loads in both diections. The DB aangement has a wide space between load points and can handle lage moment loads. Fo this eason, this type of duplex aangement is pefeable fo use on the main spindles of machine tools. The DF aangement cannot handle lage moment loads, but its allowable inclination angle is geate than that of the DB aangement. The tandem duplex (DT) aangement can handle both a adial load and lage axial load, but this beaing can take the axial load in one diection only. The -ow duplex (type DTBT) aangement ensues high igidity in the adial and axial diections and accommodates high-speed opeation. Fo this eason, this type of duplex beaing is commonly used fo the main spindles of machining centes. Each duplex angula contact ball beaing is manufactued as a set to enable adjustment of the peload and cleaance. Fo this eason, combine only duplex beaings of the same poduct numbe TT 2TT Notes:. The mean value should be the taget value. 2. If the dmn value of the high-speed machine is in the ange of dmn, it is necessay to incease the amount of intefeence. In this case, contact NTN Engineeing fo technical assistance. T: Tight (Intefeence) Fit DB duplex aangement DF duplex aangement DT duplex aangement Table 9.2 Housing fit Unit: Nominal outside diamete D Fit of oute ing with housing Ove Incl. Beaing on fixed side Beaing on fee side 2 2LL LL L9L LL L2L LL DBT duplex aangement Fig. 9. DTBT duplex aangement 2 2 LL LL LL LL LL L2L 2 LL L2L Notes:. The mean value should be the taget value. 2. If the dmn value is in the ange of dmn, space width and beaing aangement, it is necessay to incease the amount of intefeence. In this case, contact NTN Engineeing fo technical assistance. L: Loose fit

73 NTN Main Spindle Beaings Duplex aangement codes fo angula contact ball beaings Each duplex ball beaing has a poduct numbe and duplex aangement code etched on its side face. On angula contact ball beaing sets of thee o moe, each matching beaing has a "<" mak on its outside suface. ~~~ Be sue to align the "<" mak when assembling the ~~~ beaings. Note that duplex angula contact ball beaing types DB and DF do not have the "<" mak. To match them, ~~~ align the duplex aangement codes. Poduct numbe/duplex aangement code A Poduct numbe/duplex aangement code AB Poduct numbe Fig. 9. Poduct numbe Poduct numbe Poduct numbe Poduct numbe/duplex aangement code BC Poduct numbe 9 Flush ginding and univesal matching Angula contact ball beaings ae often combined fo a special pupose. Face-to-face duplex (DF) aangement, back-to-back duplex (DB) aangement and tandem duplex (DT) aangement may be combined in ows of two o moe. When combining many beaings, it is impotant to contol the accuacies of the beaings and to align thei face heights in a common plane. Flush ginding Flush ginding is a finishing technique in which the font and back faces of the inne and oute ings ae aligned with each othe to eliminate diffeences in face height (Fig. 9.2). Such alignment can ensue the specified cleaance and Back Face height diffeence A Face height diffeence B Font A=B Fig. 9.2 Flush ginding peload fo DF, DB, and DT sets, but it is possible only if the combined beaings have the same cleaance/peload symbols. The flush ginding technique is employed fo standad BNT seies, seies, and 2 seies beaings designed fo main spindles of machine tools, and fo 2A-BST thust angula contact ball beaings designed to suppot ballscews. Note: The flush ginding technique is also adopted fo othe types of angula contact ball beaings. When odeing a beaing, append G to the poduct numbe to specify the flush gound type. Example: UC G/GNP Contol of beaing-tobeaing diffeence Contol of beaing-tobeaing diffeence Fig. 9. Combinations can be changed. Adjustment of the cleaance is not necessay. Contol of beaing-tobeaing diffeence Contol of beaing-tobeaing diffeence Combinations can be changed. Adjustment of the cleaance is not necessay. Fig. 9. Univesal matching Univesal Matching In addition to the flush ginding technique, univesal matching is employed fo duplex angula contact ball beaings. Univesal matching contols the beaing-tobeaing dimensional diffeences in the boe and outside diametes. NTN can contol the beaing-to-beaing diffeence in the boe and outside diametes to no moe than onethid the toleance (a minimum of 2 m). Univesal matching is adopted fo duplex angula contact ball beaings of JIS class o bette. When odeing a beaing, specify the desied numbe of duplex beaings to be used in combination ( D2 fo DB, DF o DT; and D fo DBT, DFT o DTT). Contol of beaing-tobeaing diffeence Contol of beaing-tobeaing diffeence DB aangement DF aangement DT aangement Altenately, indicate the basic combination and specify univesal matching. If two duplex beaings ae combined, D2 is appended to the poduct numbe. Example: UC G D2/GNP 9

74 NTN Main Spindle Beaings! Angula contact ball beaings with ceamic balls Recently, the main spindles of machining centes, NC machines and othe machine tools have been equied to opeate at much highe speeds. Beaings fo main spindles theefoe must meet the equiements of high speed and igidity as well as accuacy. To meet such equiements, many of ou customes want the olling element made of ceamic mateial. The featues of angula contact ball beaings with ceamic balls ae descibed below. Limited tempeatue ise and ulta-high speeds The specific gavity of ceamic mateial is one-half that of beaing steel. In addition, the ball diamete of S-HSE type is smalle than that of the standad type. Fo this eason, use of ceamic balls geatly educes the influence of centifugal foce (ball sliding and spinning caused by gyatoy moment). As a esult, these angula contact ball beaings inhibit tempeatue buildup and ensue ulta-high speed. High beaing igidity fo high accuacy of manufactued poducts The Young s modulus of ceamic mateial is appoximately. times that of beaing steel. The igidity of these angula contact ball beaings is theefoe geatly inceased. Fig. 9. Test ig fo measuing tempeatue ise Beaing tempeatue ise C Beaing tested2la-hseoc Shaft speed 2 min - Lubication Ai-oil lubication Aiflow ate NL/min Oil supply ate. ml/h 2 Steel ball Ceamic ball Table 9.22 Compaison of physical popeties between ceamic and steel balls Density (g/cm ) Item Young s modulus (GPa) Poisson s atio Themal expansion ( - / C) Themal conductivity atio (Cal/cms C) Ceamic (SiN) Beaing steel (SUJ2) Speed min - Fig. 9. Compaison of tempeatue ise between beaings with ceamic balls and those with steel balls

75 NTN Main Spindle Beaings! Opeating life of beaings with ceamic balls Test conditions Beaing tested2 Beaing load N kgf Shaft speed 2 min - Lubication Class tubine oil (VG), ciculating lubication Test machine Coupling Pulley Loading sping Suppot beaing 2 Test beaing Accumulative pobability of failue % Hatched aea: With steel balls : With ceamic balls Opeating lifeln Fig. 9. Radial load-type beaing life test machine Fig. 9. Opeating life of ball beaing with ceamic balls Beaing fiction toquenmm 2 Steel ball Ceamic ball,,, 2, Speedmin - Displacement in axial diection 2 2 Steel ball Ceamic ball 2 Axial loadn Fig. 9. Fictional toque Fig. 9.9 Displacement in axial diection

76 NTN Main Spindle Beaings!2 Recommended lubication Angula contact ball beaings ae usually used with gease lubication o ai-oil lubication. Recommended lubication specifications ae descibed below. Gease lubication Recommended band of gease Refe to. Lubication of Beaings, - Gease lubication in the Technical Data section. Recommended gease fill dmn value % of the capacity shown in the dimension tables dmn 2% of the capacity shown in the dimension tables Recommended gease filling method Refe to. Handling of Beaings, - Cleaning of beaings and filling with gease in the Technical Data section. Notes Gease-lubicated sealed angula contact ball beaings (9 LLB/ LLB type, and BNS type beaings) ae pefilled with long-life SE- gease. Wipe ust peventive oil fom the outside of the beaing with a clean cloth. Ai-oil lubication Recommended location of nozzle Refe to. Lubication of Beaings, -2 Ai-oil lubication in the Technical Data section. Recommended specifications of nozzle Nozzle boe dia.: to. mm Numbe of nozzles: One nozzle pe beaing, depth of nozzle boe should be fou to six times as lage as the boe diamete. Recommended specifications of ai-oil Oil type: Spindle oil Viscosity gade: ISO VG fom to 2 (2 is pefeable) Table. 9.2 Ai and oil amount Beaing type C,9U,U, 2C dmn value ( ) Ove Incl.. Oil valume pe shot ml Lubication intevals min Oil consumption ml/h.2 Recommended ai consumption NL/min HSE9, HSE HSF HSL HSFL NR/min (Nomal lite/minute)... NRmeans the volume of ai at C and atmosphee. 2

77 NTN Main Spindle Beaings! Standad angula contact ball beaings 9U and U types ULTAGE 9U and U seies beaings wee developed fom standad angula contact ball beaings (9 and ). Optimized intenal design and adoption of a new esin cage allows high-speed opeation and ensues high igidity. Featues. Optimized intenal design enables high-speed opeation and high igidity. 2. A new esin cage enables impovement in gease etention fo gease lubication and enhanced pefomance in feeding and dischage of oil fo ai-oil lubication.. Beaings ae available with eithe steel o ceamic balls.. Thee contact angles (, 2, and ) ae available to handle a wide ange of applications. Beaing specifications Ai-oil Fig U and U types Photo 9. New esin cage High-speed opeation Optimized intenal design and adoption of a new esin cage enable stable opeation at dmn value 9, with gease lubication. Test conditions Test Beaing Shaft speed Peload afte assembled Gease lubication Tempeatue incease on oute ing C Tempeatue incease on oute ing C 2 Test conditions Tested Beaing Speed Peload afte assembled Ai-oil lubication UCDB () min - 2 N (Fixed position peloading) NBU dmn value Fig. 9.2 High-speed test with gease lubication Stable opeation is possible with dmn value., with ai-oil lubication. 2 2 w/ jacket cooling w/o jacket cooling 2.. w/ jacket cooling w/o jacket cooling Speedmin - UCDB () 2 min - 2 N (Fixed position peloading). ml/shot (oil injection intevals: min, ai consumption: NL/min) 2 2 Speedmin -.. dmn value Fig High-speed test with ai-oil lubication Pemissible speed ange dmn value U Gease lubication Ai-oil lubication 9U S-U S-9U 2 Notes) Pemissible speed of each beaing (dmn value) vaies depending on the specifications of the machine on which the beaing is used (moto dive system, cooling system, and constuction aound the beaing). Conside the optimal choice efeing to the above guideline (fo two-ow aangement), and then, contact NTN Engineeing fo technical assistance.

78 NTN Main Spindle Beaings! High-speed angula contact ball beaings HSE type The HSE type employs a special mateial featuing geatly impoved wea esistance and anti-seizue popeties as well as a special suface modification technique. Futhemoe, thanks to an optimized intenal design, this type achieves high speed, high igidity and high eliability. Featues. Adoption of special mateials and a unique intenal design impove anti-seizue popeties ( times bette than the conventional type) and wea esistance ( times bette than of the conventional type). 2. Optimized intenal design enables high-speed opeation and high igidity.. Beaings ae available with eithe steel o ceamic balls.. Thee contact angles (, 2, and 2 ) ae available to handle a wide ange of applications. Beaing specification Ai oil Fig. 9.2 HSE type Peload and low tempeatue ise The S-HSE type featues high speed and limited tempeatue incease. Even if its peload is inceased afte assembly into the spindle, it maintains stable pefomance at high speeds (Fig. 9.2). Test condition Test beaing Shaft speed Lubication Oil consumption Ai consumption Oute casing cooling Tempeatue incease of oute ing C S-2LA-HSE2 (contact angle 2 ) (22 ows) min - Ai-oil lubication. ml/shot (Oil shot intevals min) NL/min Povided dmn value Fig. 9.2 Relationship between peload and tempeatue incease Impoved main spindle igidity When built into a high-speed main spindle, the peload of the S-HSE standad type is maintained, allowing high igidity (.9 times geate than a conventional beaing) (Fig. 9.2). Test condition Axial displacement m Test beaing Post-assembly peload 2 2 S-HSE type Post-assembly peload N Post-assembly peload N Post-assembly peload N 2 Shaft speedmin - HSB (contact angle ) HSB (contact angle 2 ) HSE (contact angle 2 ) S-HSB2 (contact angles and 2 ) S-2LA-HSE2 (contact angle 2 ) (22 ows) S-HSB2 S-HSE2 N N Pemissible speed ange dmn value 2LA-HSE , Axial loadkn Fig. 9.2 Compaison of igidity elative to conventional beaing (HSB type) in tems of post-assembly peload 2, 2 Gease lubication Ai-oil lubication 2LA-HSE9 2, 2 2, 2 S-2LA-HSE 2, 2 2, 2 S-2LA-HSE9 2 Notes) Pemissible speed of each beaing (dmn value) vaies depending on the specifications of the machine on which the beaing is used (moto dive system, cooling system, and constuction aound the beaing). Conside the optimal choice efeing to the above guideline (fo two-ow aangement) and then contact NTN Engineeing fo technical assistance., 2 2, 2

79 NTN Main Spindle Beaings! Supe high-speed angula contact ball beaings HSF type The HSF type ealizes futhe impovement in highspeed unning and inhibited tempeatue ise by adoption of smalle diamete ceamic balls, while etaining featues of the HSE type. This type attains dmn values as high as 2. million with fixed pessue peloading. Featues. Adoption of special mateials and a unique intenal design impove anti-seizue popety ( times bette than the conventional type) and wea esistance ( time bette than the conventional type). 2. Optimized intenal design enables high-speed opeation and high igidity.. Ceamic balls ae used.. Initial contact angle is set to 2 to accommodate the change in contact angle duing supe high-speed opeation. Beaing specification Ai oil Low tempeatue ise Supe high-speed S-HSF seies angula contact ball beaings utilize smalle balls than those of the highspeed HSE seies. This educes heating due to centifugal foce and ensues lowe tempeatue ise. Thus, the S-HSF type boasts an appoximately % eduction in tempeatue ise as compaed to the S- HSE type. (Fig. 9.2) Test condition Tempeatue ise of oute ing C Test beaing Shaft speed Lubication Oil consumption Ai consumption Oute casing cooling 2 2 S-HSE (peload N) S-HSF type (peload 2 N) S-2LA-HSE2 (contact angle 2 ) S-2LA-HSF2 (contact angle 2 ) (22 ows) min - Ai-oil lubication. ml/shot (Oil shot intevals min) NL/min None 2 Shaft speedmin dmn value Fig. 9.2 Compaison of tempeatue ise Fig. 9.2 HSF type Pemissible speed ange dmn value S-2LA-HSF Fixed-pessue peloading Notes) Pemissible speed of each beaing (dmn value) vaies depending on the specifications of the machine on which the beaing is used (moto dive system, cooling system, and constuction aound the beaing). Conside the optimal choice efeing to the above guideline (fo two-ow aangement) and contact NTN Engineeing fo technical assistance.

80 NTN Main Spindle Beaings! Eco-fiendly ai-oil lubicated angula contact ball beaings HSL type HSFL type (patent pending) The HSL/HSFL type is an advanced vaiation of the HSE/HSF type, chaacteized by incopoation of NTN s unique eco-conscious lubication technology. The HSL type helps decease oil mist emissions and consumption of ai and oil, impoving the woking envionment fo machine tool opeatos and educing enegy consumption. Featues. Adoption of special mateials and a unique intenal design impove anti-seizue popeties ( times bette compaed with the conventional type) and wea esistance ( times bette than the conventional type). 2. Beaings ae available with eithe steel o ceamic balls (HSFL is available with ceamic balls only).. Adoption of eco-fiendly nozzle educes noise (eduction of 2 to dba), ai consumption (eduction of to %) and oil consumption (eduction of 2 to 9%) Beaing specification Ai-oil Ai-oil Eco-fiendly nozzle HSE(HSF) type HSL/HSFL type (ULTAGE) Fig. 9.2 HSL and HSFL types Intenal specification of HSE type Eco-fliendly specification NOTE) The HSL/HSFL type is packed togethe with the space with the eco-fliendly nozzle. The beaing type code HSL epesents the beaing pope, while a space code stands fo an eco-conscious nozzle pope o a space having a built-in nozzle. Fo moe details, see. Beaing Designation. Pemissible speed ange dmn value S-2LA-HSL 2, 2 S-2LA-HSL9 2, 2 S-2LA-HSFL Fixed-pessue peloading Notes) Pemissible speed of each beaing (dmn value) vaies depending on the specifications of the machine on which the beaing is used (moto dive system, cooling system, and constuction aound the beaing). Conside the optimal choice efeing to the above guideline (fo two-ow aangement) and contact NTN Engineeing fo technical assistance. Data In the high-speed egion of min -, the noise level of the HSL type is dba to dba lowe than that of the conventional type (HSC type) (Fig. 9.29). Noise value dba 2 9 HSFL type HSF type Test conditions Test beaing Shaft speed Peload S-2LA-HSFL2DB S-2LA-HSF2DB (22 ows) 2 min - 2. kn (constant pessue peloading) 2 Speedmin dmn value Fig Compaison of noise levels

81 NTN Main Spindle Beaings Data 2 Fo S-HSFL type beaings, the tempeatue of the oute ings emains stable even with an ai consumption as low as NR/min ( to 2% of the ecommended ai consumption fo standad beaings) at a speed of 2 min - (dmn 2. ) (Fig. 9.). Tempeatue incease of oute ing C HSFL type HSF type Test conditions Test beaing Shaft speed Peload Oil consumption S-2LA-HSFL2DB S-2LA-HSF2DB (22 ows) 2 min - 2. kn(constant pessue peloading). ml/shot (oil shot intevals, min) 2 Ai consumptionnl/min Fig. 9. Relationship between ai consumption and tempeatue incease Data The S-HSFL type beaings can opeate at 2 min - (dmn 2. ) with oil shot intevals of 2 min (eduction of 2 to 9% as compaed with the ecommended oil consumption fo standad beaings) (Fig. 9.). Tempeatue incease of oute ing C HSFL type HSF type 2 2 Oil shot intevalsmin Unstable Fig. 9. Relationship between oil shot intevals and tempeatue incease Test conditions Test beaing Shaft speed Peload Oil consumption Ai consumption S-2LA-HSFL2DB S-2LA-HSF2DB (22 ows) 2 min - 2. kn (constant pessue peloading). ml/shot 2. NL/min Data S-HSL type beaings can eliably un at a speed of 9 min - (fixed position peloading) (Fig. 9.2) with both decease ai and oil consumption. Tempeatue incease of oute ing C HSL type HSE type Unstable Speedmin dmn value Fig. 9.2 High-speed test esults (fixed position peloading) Test conditions Test beaing Shaft speed Peload Oil consumption Ai consumption S-2LA-HSL2DB S-2LA-HSE2DB (22 ows) 9 min - Afte assembly, (fixed position peloading). ml/shot (oil shot intevals, min) NL/min (HSL) NL/min (HSE)

82 NTN Main Spindle Beaings! Gease-lubicated sealed standad angula contact ball beaings 9LLB and LLB, S-9LLB and S-LLB types The 9LLB and LLB types ae gease-lubicated, eco-fiendly beaings that can achieve stable high-speed opeation with limited tempeatue ise. They can allow, longe sevice life and pesevation of healthy woking envionment fo otating tools with shaft diametes less than mm. Featues. Intenal design is optimized fo high-speed opeation and limited tempeatue ise. 2. Longe gease life due to adoption of special gease and non-contact seals fo gease etention.. Contact angles of and 2 ae available.. The standad types meet special pecision P2 equiements (dimensional pecision JIS P and unning accuacy JIS P2).. Seals of diffeent colos ae used fo font (black) and back (oange) sides. Beaing configuation can be easily identified by colo.. Available with eithe steel o ceamic balls. Beaing specifications Back Font Fig. 9. 9LLB and LLB types Simplified main spindle configuation Due to the optimized intenal stuctue, the 9LLB and LLB types can eliably un at a highe speed with gease lubication. The gease lubicating system is vitually fee fom oil mist emission, and contibutes to a simple main spindle stuctue, eduction in envionmental impact and decease in cost. (Fig. 9.) Ai-oil lubication Gease lubication Simplifies the main spindle stuctue, and educes the initial and opeation costs. Fig. 9. Modification of lubication system (ai-oil lubication to gease lubication) Easie handling with 9LLB and LLB types The 9LLB and LLB types ae pefilled with gease. They can be eadily used afte only wiping away ust peventive oil. Seals of diffeent colos ae used fo the font and back sides of the beaing. Black seals ae used fo the font sides and oange seals ae used fo the back sides, so configuations ae eadily identified by colos. (Table 9.2) Table 9.2 Beaing Combinations and Seal Colos DB set (back faces in combination) DF set (font faces in combination) Oange seal Oange seal Black seal Black seal

83 NTN Main Spindle Beaings Pemissible speed ange dmn value LLB 2 9 LLB 2 S- LLB 2 S-9 LLB 2 Notes) Pemissible speed of each beaing (dmn value) vaies depending on the specifications of the machine on which the beaing is used (moto dive system, cooling system, and constuction aound the beaing). Conside the optimal choice efeing to the above guideline (fo two-ow aangement) and contact NTN Engineeing fo technical assistance. High-speed test Optimization of the intenal design pomotes stable opeation of dmn value.. (Figs.9. and 9.) Tempeatue ise of oute ing C 2 2 CDw/o jacket cooling CDw/ jacket cooling ADw/o jacket cooling ADw/ jacket cooling 2 2 Speedmin - Tested beaing Shaft speed Pe-load afte assembled CDLLBDBP2 ADLLBDBP2 (2 ows) 2 min - NS-CDLLB 2 NS-ADLLB.2... dmn value Fig. 9. High-speed test esults (CD, contact angle ) (AD, contact angle 2 ) Tempeatue ise of oute ing C 2 2 S-CDw/o jacket cooling S-CDw/ jacket cooling S-ADw/o jacket cooling S-ADw/ jacket cooling 2 2 Speedmin -.. dmn value Test conditions Tested beaing Shaft speed Pe-load afte assembled S-CDLLBDBP2 S-ADLLBDBP2 (2 ows) 2 min - NS-CDLLB 2 NS-ADLLB Fig. 9. High-speed test esults (S-CD, contact angle ) (S-AD, contact angle 2 ) 9

84 NTN Main Spindle Beaings! Gease-lubicated sealed angula contact ball beaings BNS LLB and S-2LA-BNS LLB types By the optimized mateial and intenal stuctue, BNS LLB type beaings have excellent pefomance at highe speeds. This helps to educe pollution and cost. Beaing specification Featues. Adoption of special mateials and unique intenal design impove anti-seizue popeties ( times bette than the conventional type) and wea esistance ( times bette than the conventional type). 2. Optimized intenal design enables high-speed opeation and high igidity.. Available with eithe steel o ceamic balls.. Adoption of gease pockets, special gease, and non-contact seals impoves sevice life of the gease. Fig. 9. BNS LLB type Simplified main spindle configuation BNS LLB type beaings can eliably opeate at a highe speed with gease lubication. The gease lubication system is vitually fee fom oil mist emission can simplify the main spindle stuctue, educe pollution and decease cost (Fig. 9.). Ai-oil lubication Gease lubication Capable of eplacing ai-oil lubicated beaings up to dmn value of,,. Simplifies the main spindle stuctue and educes the initial and opeating costs. Fig. 9. Modification of lubication system (ai-oil lubication to gease lubication) Easie handling with BNS LLB type The BNS LLB type has been packed with gease in advance. They can be used afte wiping away ust peventive oil. Seals in diffeent colos ae used fo the font and back sides of the beaings. Black seals ae used fo the font sides and oange seals ae used fo the back sides, so configuations can be easily identified by colo. (Table 9.22) Table 9.22 Beaing Combinations and Seal Colos DB set (back faces in combination) DF set (font faces in combination) Oange seal Oange seal Black seal Black seal

85 NTN Main Spindle Beaings Pemissible speed ange dmn value LA-BNS LLB 2, 2 2LA-BNS9 LLB 2, 2 S-2LA-BNS LLB 2, 2 S-2LA-BNS9 LLB 2, 2 Notes) Pemissible speed of each beaing (dmn value) vaies depending on the specifications of the machine on which the beaing is used (moto dive system, cooling system, and constuction aound the beaing). Conside the optimal choice efeing to the above guideline (fo two-ow aangement) and contact NTN Engineeing fo technical assistance. Tempeatue incease S-2LA-BNS LLB type beaings exhibit stable tempeatue incease up to a dmn value of,, (Fig. 9.9). Tempeatue incease of oute ing C Speedmin - Test conditions Test beaing Shaft speed Oute casing cooling S-2LA-BNS2 LLBDB (22 ows) min - Povided... dmn value Fig. 9.9 High-speed test esults Duability test As a esult of optimized design (such as gease esevoi) and special gease, S-2LA-BNS LLB type beaing have successfully achieved continuous opeation in excess of 2, hous at a dmn value of,, (Fig. 9.). Test conditions BNS type HSB type h 2 h o longe Moe than 2 times Test beaing Shaft speed Peload Oute casing cooling S-2LA-BNS2 LLBDB S-HSB2C (22 ows) min - Afte assembly, Povided Duation, h Fig. 9. Duability test esults

86 Main Spindle Beaings!9Dimension tables fo angula contact ball beaings Standad angula contact ball beaings (steel ball type) seies Contact angle d 2mm B D D d d D2 a pat Bounday dimensions Basic load atings Static axial Facto Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min - gease oil d D B s min s min C Co C Co fo lubication lubication C C C C C C C C C C C C C C C C C C C C C C C C Minimum allowable value fo cone adius dimension o. 2

87 Main Spindle Beaings as as da Db as as da Da Dynamic equivalent adial load PXFYFa Single ow / Tandem Back-to-back / Face-to-face ifofa e FaFe FaFe FaFe FaFe Co X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo...92 When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions Pat cente fee space numbe mm cm kg mm Single-ow Single-ow da Da Db as as a (appox.) (appox.) d D D2 min max max max max C C C C C C C C C C C C C C C C C C C C C C C C

88 Main Spindle Beaings Standad angula contact ball beaings (steel ball type) 9 seies Contact angle d mm B B D Dd2 d d D2 D D d d D2 a d a d Pat Bounday dimensions Basic load atings Static axial Facto Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min - gease oil d D B s min s min C Co C Co fo lubication lubication 9UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC CTB CTB CTB CTB Minimum allowable value fo cone adius dimension o.

89 Main Spindle Beaings as as da Db as as da Da Dynamic equivalent adial load PXFYFa Single ow / Tandem Back-to-back / Face-to-face ifofa e FaFe FaFe FaFe FaFe Co X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo...92 When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions Pat cente fee space numbe mm cm kg mm Single-ow Single-ow da Da Db as as a (appox.) (appox.) d d2 D D2 min max max max max UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC CTB CTB CTB CTB

90 Main Spindle Beaings Standad angula contact ball beaings (steel ball type) 9 seies Contact angle 2 d mm B D D d2 dd D2 a Pat Bounday dimensions Basic load atings Static axial Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min - gease oil d D B s min s min C Co C Co lubication lubication 9UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD Minimum allowable value fo cone adius dimension o.

91 Main Spindle Beaings as as as da Db as da Da Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo... When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions Pat cente fee space numbe mm cm kg mm Single-ow Single-ow da Da Db as as a (appox.) (appox.) d d2 D D2 min max max max max UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD

92 Main Spindle Beaings Standad angula contact ball beaings (steel ball type) 9 seies Contact angle d mm B B D Dd2 d d D2 D D d d D2 a d a d Pat Bounday dimensions Basic load atings Static axial Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min - gease oil d D B s min s min C Co C Co lubication lubication 9U U U U U U U U U U U U U U U U U U U U U U U U U Minimum allowable value fo cone adius dimension o.

93 Main Spindle Beaings as as as da Db as da Da Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo... When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions Pat cente fee space numbe mm cm kg mm Single-ow Single-ow da Da Db as as a (appox.) (appox.) d d2 D D2 min max max max max U U U U U U U U U U U U U U U U U U U U U U U U U 9

94 Main Spindle Beaings Standad angula contact ball beaings (steel ball type) seies Contact angle d 2mm B B D Dd2 d d D2 D D d d D2 a d a d 9 Pat Bounday dimensions Basic load atings Static axial Facto Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min - gease oil d D B s min s min C Co C Co fo lubication lubication UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC CTB CTB CTB CTB CTB CTB CTB Minimum allowable value fo cone adius dimension o.

95 Main Spindle Beaings as as da Db as as da Da Dynamic equivalent adial load PXFYFa Single ow / Tandem Back-to-back / Face-to-face ifofa e FaFe FaFe FaFe FaFe Co X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo...92 When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions Pat cente fee space numbe mm cm kg mm Single-ow Single-ow da Da Db as as a (appox.) (appox.) d d2 D D2 min max max max max UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC CTB CTB CTB CTB CTB CTB CTB 9

96 Main Spindle Beaings Standad angula contact ball beaings (steel ball type) seies Contact angle 2 d mm B D D d2 dd D2 a Pat Bounday dimensions Basic load atings Static axial Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min - gease oil d D B s min s min C Co C Co lubication lubication UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD Minimum allowable value fo cone adius dimension o. 92

97 Main Spindle Beaings as as as da Db as da Da Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo... When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions Pat cente fee space numbe mm cm kg mm Single-ow Single-ow da Da Db as as a (appox.) (appox.) d d2 D D2 min max max max max UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD 9

98 Main Spindle Beaings Standad angula contact ball beaings (steel ball type) seies Contact angle d mm B D D d2 dd D2 a Pat Bounday dimensions Basic load atings Static axial Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min - gease oil d D B s min s min C Co C Co lubication lubication U U U U U U U U U U U U U U U U U U U U U U U U U Minimum allowable value fo cone adius dimension o. 9

99 Main Spindle Beaings as as as da Db as da Da Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo... When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions Pat cente fee space numbe mm cm kg mm Single-ow Single-ow da Da Db as as a (appox.) (appox.) d d2 D D2 min max max max max U U U U U U U U U U U U U U U U U U U U U U U U U 9

100 Main Spindle Beaings Standad angula contact ball beaings (steel ball type) 2 seies Contact angle d mm B D D d d D2 a Pat Bounday dimensions Basic load atings Static axial Facto Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min - gease oil d D B s min s min C Co C Co fo lubication lubication 2C C C C C C C C C C C C C C C C C C C C C CTB CTB CTB CTB Minimum allowable value fo cone adius dimension o. 9

101 Main Spindle Beaings as as da Db as as da Da Dynamic equivalent adial load PXFYFa Single ow / Tandem Back-to-back / Face-to-face ifofa e FaFe FaFe FaFe FaFe Co X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo...92 When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions Pat cente fee space numbe mm cm kg mm Single-ow Single-ow da Da Db as as a (appox.) (appox.) d D D2 min max max max max C C C C C C C C C C C C C C C C C C C C C CTB CTB CTB CTB 9

102 Main Spindle Beaings Standad angula contact ball beaings (ceamic ball type) S-9 seies Contact angle d mm B D D d2 dd D2 a Pat Bounday dimensions Basic load atings Static axial Facto Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min - gease oil d D B s min s min C Co C Co fo lubication lubication S-9UC S-9UC S-92UC S-9UC S-9UC S-9UC S-9UC S-9UC S-9UC S-99UC S-9UC S-9UC S-92UC S-9UC S-9UC S-9UC S-9UC S-9UC S-9UC S-99UC S-92UC S-92UC S-922UC S-92UC S-92UC Minimum allowable value fo cone adius dimension o. 9

103 Main Spindle Beaings as as da Db as as da Da Dynamic equivalent adial load PXFYFa Single ow / Tandem Back-to-back / Face-to-face ifofa e FaFe FaFe FaFe FaFe Co X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo...92 When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions Pat cente fee space numbe mm cm kg mm Single-ow Single-ow da Da Db as as a (appox.) (appox.) d d2 D D2 min max max max max S-9UC S-9UC S-92UC S-9UC S-9UC S-9UC S-9UC S-9UC S-9UC S-99UC S-9UC S-9UC S-92UC S-9UC S-9UC S-9UC S-9UC S-9UC S-9UC S-99UC S-92UC S-92UC S-922UC S-92UC S-92UC 99

104 Main Spindle Beaings Standad angula contact ball beaings (ceamic ball type) S-9 seies Contact angle 2 d mm B D D d2 dd D2 a Pat Bounday dimensions Basic load atings Static axial Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min - gease oil d D B s min s min C Co C Co lubication lubication S-9UAD S-9UAD S-92UAD S-9UAD S-9UAD S-9UAD S-9UAD S-9UAD S-9UAD S-99UAD S-9UAD S-9UAD S-92UAD S-9UAD S-9UAD S-9UAD S-9UAD S-9UAD S-9UAD S-99UAD S-92UAD S-92UAD S-922UAD S-92UAD S-92UAD Minimum allowable value fo cone adius dimension o.

105 Main Spindle Beaings as as as da Db as da Da Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo... When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions Pat cente fee space numbe mm cm kg mm Single-ow Single-ow da Da Db as as a (appox.) (appox.) d d2 D D2 min max max max max S-9UAD S-9UAD S-92UAD S-9UAD S-9UAD S-9UAD S-9UAD S-9UAD S-9UAD S-99UAD S-9UAD S-9UAD S-92UAD S-9UAD S-9UAD S-9UAD S-9UAD S-9UAD S-9UAD S-99UAD S-92UAD S-92UAD S-922UAD S-92UAD S-92UAD

106 Main Spindle Beaings Standad angula contact ball beaings (ceamic ball type) S-9 seies Contact angle d mm B D D d2 dd D2 a Pat Bounday dimensions Basic load atings Static axial Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min - gease oil d D B s min s min C Co C Co lubication lubication S-9U S-9U S-92U S-9U S-9U S-9U S-9U S-9U S-9U S-99U S-9U S-9U S-92U S-9U S-9U S-9U S-9U S-9U S-9U S-99U S-92U S-92U S-922U S-92U S-92U Minimum allowable value fo cone adius dimension o. 2

107 Main Spindle Beaings as as as da Db as da Da Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo... When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions Pat cente fee space numbe mm cm kg mm Single-ow Single-ow da Da Db as as a (appox.) (appox.) d d2 D D2 min max max max max S-9U S-9U S-92U S-9U S-9U S-9U S-9U S-9U S-9U S-99U S-9U S-9U S-92U S-9U S-9U S-9U S-9U S-9U S-9U S-99U S-92U S-92U S-922U S-92U S-92U

108 Main Spindle Beaings Standad angula contact ball beaings (ceamic ball type) S- seies Contact angle d mm B D D d2 dd D2 a Pat Bounday dimensions Basic load atings Static axial Facto Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min - gease oil d D B s min s min C Co C Co fo lubication lubication S-UC S-UC S-2UC S-UC S-UC S-UC S-UC S-UC S-UC S-9UC S-UC S-UC S-2UC S-UC S-UC S-UC S-UC S-UC S-UC S-9UC S-2UC S-2UC S-22UC S-2UC S-2UC Minimum allowable value fo cone adius dimension o.

109 Main Spindle Beaings as as da Db as as da Da Dynamic equivalent adial load PXFYFa Single ow / Tandem Back-to-back / Face-to-face ifofa e FaFe FaFe FaFe FaFe Co X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo...92 When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions Pat cente fee space numbe mm cm kg mm Single-ow Single-ow da Da Db as as a (appox.) (appox.) d d2 D D2 min max max max max S-UC S-UC S-2UC S-UC S-UC S-UC S-UC S-UC S-UC S-9UC S-UC S-UC S-2UC S-UC S-UC S-UC S-UC S-UC S-UC S-9UC S-2UC S-2UC S-22UC S-2UC S-2UC

110 Main Spindle Beaings Standad angula contact ball beaings (ceamic ball type) S- seies Contact angle 2 d mm B D D d2 dd D2 a Pat Bounday dimensions Basic load atings Static axial Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min - gease oil d D B s min s min C Co C Co lubication lubication S-UAD S-UAD S-2UAD S-UAD S-UAD S-UAD S-UAD S-UAD S-UAD S-9UAD S-UAD S-UAD S-2UAD S-UAD S-UAD S-UAD S-UAD S-UAD S-UAD S-9UAD S-2UAD S-2UAD S-22UAD S-2UAD S-2UAD Minimum allowable value fo cone adius dimension o.

111 Main Spindle Beaings as as as da Db as da Da Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo... When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions Pat cente fee space numbe mm cm kg mm Single-ow Single-ow da Da Db as as a (appox.) (appox.) d d2 D D2 min max max max max S-UAD S-UAD S-2UAD S-UAD S-UAD S-UAD S-UAD S-UAD S-UAD S-9UAD S-UAD S-UAD S-2UAD S-UAD S-UAD S-UAD S-UAD S-UAD S-UAD S-9UAD S-2UAD S-2UAD S-22UAD S-2UAD S-2UAD

112 Main Spindle Beaings Standad angula contact ball beaings (ceamic ball type) S- seies Contact angle d mm B D D d2 dd D2 a Pat Bounday dimensions Basic load atings Static axial Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min - gease oil d D B s min s min C Co C Co lubication lubication S-U S-U S-2U S-U S-U S-U S-U S-U S-U S-9U S-U S-U S-2U S-U S-U S-U S-U S-U S-U S-9U S-2U S-2U S-22U S-2U S-2U Minimum allowable value fo cone adius dimension o.

113 Main Spindle Beaings as as as da Db as da Da Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo... When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions Pat cente fee space numbe mm cm kg mm Single-ow Single-ow da Da Db as as a (appox.) (appox.) d d2 D D2 min max max max max S-U S-U S-2U S-U S-U S-U S-U S-U S-U S-9U S-U S-U S-2U S-U S-U S-U S-U S-U S-U S-9U S-2U S-2U S-22U S-2U S-2U 9

114 Main Spindle Beaings High-speed angula contact ball beaings (steel ball type) 2LA-HSE9U seies Contact angle d mm B D D d2 d d D2 a Pat Bounday dimensions Basic load atings Static axial Facto Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min - gease oil d D B s min s min C Co C Co fo lubication lubication 2LA-HSE9UC LA-HSE9UC LA-HSE92UC LA-HSE9UC LA-HSE9UC LA-HSE9UC LA-HSE9UC LA-HSE9UC LA-HSE9UC LA-HSE99UC LA-HSE92UC LA-HSE92UC LA-HSE922UC LA-HSE92UC LA-HSE92UC LA-HSE92UC LA-HSE9UC LA-HSE92UC LA-HSE9UC Minimum allowable value fo cone adius dimension o.

115 Main Spindle Beaings as as dadb as as dbda Dynamic equivalent adial load PXFYFa Single ow / Tandem Back-to-back / Face-to-face ifofa e FaFe FaFe FaFe FaFe Co X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo.2 Yo Xo Yo... When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions cente fee space mm cm kg mm Single-ow Single-ow da db Da Db as as a (appox.) (appox.) d d2 D D2 min min max max max max

116 Main Spindle Beaings High-speed angula contact ball beaings (steel ball type) 2LAHSE9U seies Contact angle 2 d mm B D D d2 d d D2 a Pat Bounday dimensions Basic load atings Static axial Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min - gease oil d D B s min s min C Co C Co lubication lubication 2LA-HSE9U LA-HSE9U LA-HSE92U LA-HSE9U LA-HSE9U LA-HSE9U LA-HSE9U LA-HSE9U LA-HSE9U LA-HSE99U LA-HSE92U LA-HSE92U LA-HSE922U LA-HSE92U LA-HSE92U LA-HSE92U LA-HSE9U LA-HSE92U LA-HSE9U Minimum allowable value fo cone adius dimension o. 2

117 Main Spindle Beaings as as as dadb as dbda Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo..2. When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions cente fee space mm cm kg Single-ow Single-ow da db Da Db as as a (appox.) (appox.) d d2 D D2 min min max max max max

118 Main Spindle Beaings High-speed angula contact ball beaings (steel ball type) 2LAHSE9U seies Contact angle 2 d mm B D D d2 d d D2 a Pat Bounday dimensions Basic load atings Static axial Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min - gease oil d D B s min s min C Co C Co lubication lubication 2LA-HSE9UAD LA-HSE9UAD LA-HSE92UAD LA-HSE9UAD LA-HSE9UAD LA-HSE9UAD LA-HSE9UAD LA-HSE9UAD LA-HSE9UAD LA-HSE99UAD LA-HSE92UAD LA-HSE92UAD LA-HSE922UAD LA-HSE92UAD LA-HSE92UAD LA-HSE92UAD LA-HSE9UAD LA-HSE92UAD LA-HSE9UAD Minimum allowable value fo cone adius dimension o.

119 Main Spindle Beaings as as as dadb as dbda Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo... When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions cente fee space mm cm kg mm Single-ow Single-ow da db Da Db as as a (appox.) (appox.) d d2 D D2 min min max max max max

120 Main Spindle Beaings High-speed angula contact ball beaings (steel ball type) 2LA-HSE seies Contact angle d mm B D D d2 d d D2 a Pat Bounday dimensions Basic load atings Static axial Facto Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min - gease oil d D B s min s min C Co C Co fo lubication lubication 2LA-HSEC LA-HSEC LA-HSE2C LA-HSEC LA-HSEC LA-HSEC LA-HSEC LA-HSEC LA-HSEC LA-HSE9C LA-HSE2C LA-HSE2C LA-HSE22C LA-HSE2C LA-HSE2C LA-HSE2C LA-HSEC LA-HSE2C LA-HSEC Minimum allowable value fo cone adius dimension o.

121 Main Spindle Beaings as as dadb as as dbda Dynamic equivalent adial load PXFYFa Single ow / Tandem Back-to-back / Face-to-face ifofa e FaFe FaFe FaFe FaFe Co X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo.2 Yo Xo Yo... When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions cente fee space mm cm kg mm Single-ow Single-ow da db Da Db as as a (appox.) (appox.) d d2 D D2 min min max max max max

122 Main Spindle Beaings High-speed angula contact ball beaings (steel ball type) 2LA-HSE seies Contact angle 2 d mm B D D d2 d d D2 a Pat Bounday dimensions Basic load atings Static axial Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min - gease oil d D B s min s min C Co C Co lubication lubication 2LA-HSE LA-HSE LA-HSE LA-HSE LA-HSE LA-HSE LA-HSE LA-HSE LA-HSE LA-HSE LA-HSE LA-HSE LA-HSE LA-HSE LA-HSE LA-HSE LA-HSE LA-HSE LA-HSE Minimum allowable value fo cone adius dimension o.

123 Main Spindle Beaings as as as dadb as dbda Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo..2. When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions cente fee space mm cm kg mm Single-ow Single-ow da db Da Db as as a (appox.) (appox.) d d2 D D2 min min max max max max

124 Main Spindle Beaings High-speed angula contact ball beaings (steel ball type) 2LA-HSE seies Contact angle 2 d mm B D D d2 d d D2 a Pat Bounday dimensions Basic load atings Static axial Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min - gease oil d D B s min s min C Co C Co lubication lubication 2LA-HSEAD LA-HSEAD LA-HSE2AD LA-HSEAD LA-HSEAD LA-HSEAD LA-HSEAD LA-HSEAD LA-HSEAD LA-HSE9AD LA-HSE2AD LA-HSE2AD LA-HSE22AD LA-HSE2AD LA-HSE2AD LA-HSE2AD LA-HSEAD LA-HSE2AD LA-HSEAD Minimum allowable value fo cone adius dimension o. 2

125 Main Spindle Beaings as as as dadb as dbda Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo... When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions cente fee space mm cm kg mm Single-ow Single-ow da db Da Db as as a (appox.) (appox.) d d2 D D2 min min max max max max

126 Main Spindle Beaings High-speed angula contact ball beaings (ceamic ball type) S-2LA-HSE9U seies Contact angle d mm B D D d2 d d D2 a Pat Bounday dimensions Basic load atings Static axial Facto Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min - gease oil d D B s min s min C Co C Co fo lubication lubication S-2LA-HSE9UC S-2LA-HSE9UC S-2LA-HSE92UC S-2LA-HSE9UC S-2LA-HSE9UC S-2LA-HSE9UC S-2LA-HSE9UC S-2LA-HSE9UC S-2LA-HSE9UC S-2LA-HSE99UC S-2LA-HSE92UC S-2LA-HSE92UC S-2LA-HSE922UC S-2LA-HSE92UC S-2LA-HSE92UC S-2LA-HSE92UC S-2LA-HSE9UC S-2LA-HSE92UC S-2LA-HSE9UC Minimum allowable value fo cone adius dimension o. 22

127 Main Spindle Beaings as as dadb as as dbda Dynamic equivalent adial load PXFYFa Single ow / Tandem Back-to-back / Face-to-face ifofa e FaFe FaFe FaFe FaFe Co X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo.2 Yo Xo Yo... When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions cente fee space mm cm kg mm Single-ow Single-ow da db Da Db as as a (appox.) (appox.) d d2 D D2 min min max max max max

128 Main Spindle Beaings High-speed angula contact ball beaings (ceamic ball type) S-2LA-HSE9U seies Contact angle 2 d mm B D D d2 d d D2 a Pat Bounday dimensions Basic load atings Static axial Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min - gease oil d D B s min s min C Co C Co lubication lubication S-2LA-HSE9U S-2LA-HSE9U S-2LA-HSE92U S-2LA-HSE9U S-2LA-HSE9U S-2LA-HSE9U S-2LA-HSE9U S-2LA-HSE9U S-2LA-HSE9U S-2LA-HSE99U S-2LA-HSE92U S-2LA-HSE92U S-2LA-HSE922U S-2LA-HSE92U S-2LA-HSE92U S-2LA-HSE92U S-2LA-HSE9U S-2LA-HSE92U S-2LA-HSE9U Minimum allowable value fo cone adius dimension o. 2

129 Main Spindle Beaings as as as dadb as dbda Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo..2. When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions cente fee space mm cm kg mm Single-ow Single-ow da db Da Db as as a (appox.) (appox.) d d2 D D2 min min max max max max

130 Main Spindle Beaings High-speed angula contact ball beaings (ceamic ball type) S-2LA-HSE9U seies Contact angle 2 d mm B D D d2 d d D2 a Pat Bounday dimensions Basic load atings Static axial Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min - gease oil d D B s min s min C Co C Co lubication lubication S-2LA-HSE9UAD S-2LA-HSE9UAD S-2LA-HSE92UAD S-2LA-HSE9UAD S-2LA-HSE9UAD S-2LA-HSE9UAD S-2LA-HSE9UAD S-2LA-HSE9UAD S-2LA-HSE9UAD S-2LA-HSE99UAD S-2LA-HSE92UAD S-2LA-HSE92UAD S-2LA-HSE922UAD S-2LA-HSE92UAD S-2LA-HSE92UAD S-2LA-HSE92UAD S-2LA-HSE9UAD S-2LA-HSE92UAD S-2LA-HSE9UAD Minimum allowable value fo cone adius dimension o. 2

131 Main Spindle Beaings as as as dadb as dbda Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo... When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions cente fee space mm cm kg mm Single-ow Single-ow da db Da Db as as a (appox.) (appox.) d d2 D D2 min min max max max max

132 Main Spindle Beaings High-speed angula contact ball beaings (ceamic ball type) S-2LA-HSE seies Contact angle d mm B D D d2 d d D2 a Pat Bounday dimensions Basic load atings Static axial Facto Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min - gease oil d D B s min s min C Co C Co fo lubication lubication S-2LA-HSEC S-2LA-HSEC S-2LA-HSE2C S-2LA-HSEC S-2LA-HSEC S-2LA-HSEC S-2LA-HSEC S-2LA-HSEC S-2LA-HSEC S-2LA-HSE9C S-2LA-HSE2C S-2LA-HSE2C S-2LA-HSE22C S-2LA-HSE2C S-2LA-HSE2C S-2LA-HSE2C S-2LA-HSEC S-2LA-HSE2C S-2LA-HSEC Minimum allowable value fo cone adius dimension o. 2

133 Main Spindle Beaings as as dadb as as dbda Dynamic equivalent adial load PXFYFa Single ow / Tandem Back-to-back / Face-to-face ifofa e FaFe FaFe FaFe FaFe Co X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo.2 Yo Xo Yo... When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions cente fee space mm cm kg mm Single-ow Single-ow da db Da Db as as a (appox.) (appox.) d d2 D D2 min min max max max max

134 Main Spindle Beaings High-speed angula contact ball beaings (ceamic ball type) S2LAHSE seies Contact angle 2 d mm B D D d2 d d D2 a Pat Bounday dimensions Basic load atings Static axial Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min - gease oil d D B s min s min C Co C Co lubication lubication S-2LA-HSE S-2LA-HSE S-2LA-HSE S-2LA-HSE S-2LA-HSE S-2LA-HSE S-2LA-HSE S-2LA-HSE S-2LA-HSE S-2LA-HSE S-2LA-HSE S-2LA-HSE S-2LA-HSE S-2LA-HSE S-2LA-HSE S-2LA-HSE S-2LA-HSE S-2LA-HSE S-2LA-HSE Minimum allowable value fo cone adius dimension o.

135 Main Spindle Beaings as as as dadb as dbda Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo..2. When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions cente fee space mm cm kg mm Single-ow Single-ow da db Da Db as as a (appox.) (appox.) d d2 D D2 min min max max max max

136 Main Spindle Beaings High-speed angula contact ball beaings (ceamic ball type) S-2LA-HSE seies Contact angle 2 d mm B D D d2 d d D2 a Pat Bounday dimensions Basic load atings Static axial Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min - gease oil d D B s min s min C Co C Co lubication lubication S-2LA-HSEAD S-2LA-HSEAD S-2LA-HSE2AD S-2LA-HSEAD S-2LA-HSEAD S-2LA-HSEAD S-2LA-HSEAD S-2LA-HSEAD S-2LA-HSEAD S-2LA-HSE9AD S-2LA-HSE2AD S-2LA-HSE2AD S-2LA-HSE22AD S-2LA-HSE2AD S-2LA-HSE2AD S-2LA-HSE2AD S-2LA-HSEAD S-2LA-HSE2AD S-2LA-HSEAD Minimum allowable value fo cone adius dimension o. 2

137 Main Spindle Beaings as as as dadb as dbda Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo... When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions cente fee space mm cm kg Single-ow Single-ow da db Da Db as as a (appox.) (appox.) d d2 D D2 min min max max max max

138 Main Spindle Beaings Supe high-speed angula contact ball beaings S-2LA-HSF seies Contact angle 2 d mm B DD d2 d d D2 a Pat Bounday dimensions Basic load atings Static axial Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min - oil d D B s min s min C Co C Co lubication S-2LA-HSFAD...2. S-2LA-HSFAD S-2LA-HSF2AD S-2LA-HSFAD S-2LA-HSFAD S-2LA-HSFAD S-2LA-HSFAD S-2LA-HSFAD S-2LA-HSFAD S-2LA-HSF9AD S-2LA-HSF2AD Minimum allowable value fo cone adius dimension o.

139 Main Spindle Beaings as as as dadb as dbda Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo... When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions cente fee space mm cm kg mm Single-ow Single-ow da db Da Db as as a (appox.) (appox.) d d2 D D2 min min max max max max

140 Main Spindle Beaings Eco-fiendly angula contact ball beaings (ceamic ball type) S-2LA-HSL9U seies Contact angle d mm B D ddd2 a Pat Bounday dimensions Basic load atings Static axial Facto Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min - oil d D B s min s min C Co C Co fo lubication S-2LA-HSL9UC S-2LA-HSL9UC S-2LA-HSL92UC S-2LA-HSL9UC S-2LA-HSL9UC S-2LA-HSL9UC S-2LA-HSL9UC S-2LA-HSL9UC S-2LA-HSL9UC S-2LA-HSL99UC S-2LA-HSL92UC S-2LA-HSL92UC S-2LA-HSL922UC S-2LA-HSL92UC S-2LA-HSL92UC Minimum allowable value fo cone adius dimension o. 2 Fo the details of space dimensions, please contact NTN Engineeing.

141 Main Spindle Beaings l as as da Db Dynamic equivalent adial load PXFYFa Single ow / Tandem Back-to-back / Face-to-face ifofa e FaFe FaFe FaFe FaFe Co X Y X Y X Y X Y Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo.2 Yo Xo Yo... When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence Abutment and fillet dimensions Pat cente dimensions numbe mm kg mm Single-ow da Db as l 2 a (appox.) d D2 min max max min S-2LA-HSL9UC S-2LA-HSL9UC S-2LA-HSL92UC S-2LA-HSL9UC S-2LA-HSL9UC S-2LA-HSL9UC S-2LA-HSL9UC S-2LA-HSL9UC S-2LA-HSL9UC S-2LA-HSL99UC S-2LA-HSL92UC S-2LA-HSL92UC S-2LA-HSL922UC S-2LA-HSL92UC S-2LA-HSL92UC

142 Main Spindle Beaings Eco-fiendly angula contact ball beaings (ceamic ball type) S-2LA-HSL9U seies Contact angle 2 d mm B D ddd2 a Pat Bounday dimensions Basic load atings Static axial Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min - oil d D B s min s min C Co C Co lubication S-2LA-HSL9U S-2LA-HSL9U S-2LA-HSL92U S-2LA-HSL9U S-2LA-HSL9U S-2LA-HSL9U S-2LA-HSL9U S-2LA-HSL9U S-2LA-HSL9U S-2LA-HSL99U S-2LA-HSL92U S-2LA-HSL92U S-2LA-HSL922U S-2LA-HSL92U S-2LA-HSL92U Minimum allowable value fo cone adius dimension o. 2 Fo the details of space dimensions, please contact NTN Engineeing.

143 Main Spindle Beaings l as as da Db Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo..2. When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence Abutment and fillet dimensions Pat cente dimensions numbe mm kg mm Single-ow da Db as l 2 a (appox.) d D2 min max max min S-2LA-HSL9U S-2LA-HSL9U S-2LA-HSL92U S-2LA-HSL9U S-2LA-HSL9U S-2LA-HSL9U S-2LA-HSL9U S-2LA-HSL9U S-2LA-HSL9U S-2LA-HSL99U S-2LA-HSL92U S-2LA-HSL92U S-2LA-HSL922U S-2LA-HSL92U S-2LA-HSL92U 9

144 Main Spindle Beaings Eco-fiendly angula contact ball beaings (ceamic ball type) S-2LA-HSL9U seies Contact angle 2 d mm B D ddd2 a Pat Bounday dimensions Basic load atings Static axial Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min - oil d D B s min s min C Co C Co lubication S-2LA-HSL9UAD S-2LA-HSL9UAD S-2LA-HSL92UAD.... S-2LA-HSL9UAD S-2LA-HSL9UAD S-2LA-HSL9UAD S-2LA-HSL9UAD S-2LA-HSL9UAD S-2LA-HSL9UAD S-2LA-HSL99UAD S-2LA-HSL92UAD S-2LA-HSL92UAD S-2LA-HSL922UAD S-2LA-HSL92UAD S-2LA-HSL92UAD Minimum allowable value fo cone adius dimension o. 2 Fo the details of space dimensions, please contact NTN Engineeing.

145 Main Spindle Beaings l as as da Db Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo... When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence Abutment and fillet dimensions Pat cente dimensions numbe mm kg mm Single-ow da Db as l 2 a (appox.) d D2 min max max min S-2LA-HSL9UAD S-2LA-HSL9UAD S-2LA-HSL92UAD S-2LA-HSL9UAD S-2LA-HSL9UAD S-2LA-HSL9UAD S-2LA-HSL9UAD S-2LA-HSL9UAD S-2LA-HSL9UAD S-2LA-HSL99UAD S-2LA-HSL92UAD S-2LA-HSL92UAD S-2LA-HSL922UAD S-2LA-HSL92UAD S-2LA-HSL92UAD

146 Main Spindle Beaings Eco-fiendly angula contact ball beaings (ceamic ball type) S-2LA-HSL seies Contact angle d mm B D ddd2 a Pat Bounday dimensions Basic load atings Static axial Facto Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min - oil d D B s min s min C Co C Co fo lubication S-2LA-HSLC S-2LA-HSLC S-2LA-HSL2C S-2LA-HSLC S-2LA-HSLC S-2LA-HSLC S-2LA-HSLC S-2LA-HSLC S-2LA-HSLC S-2LA-HSL9C S-2LA-HSL2C S-2LA-HSL2C S-2LA-HSL22C S-2LA-HSL2C S-2LA-HSL2C Minimum allowable value fo cone adius dimension o. 2 Fo the details of space dimensions, please contact NTN Engineeing. 2

147 Main Spindle Beaings l as as da Db Dynamic equivalent adial load PXFYFa Single ow / Tandem Back-to-back / Face-to-face ifofa e FaFe FaFe FaFe FaFe Co X Y X Y X Y X Y Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo.2 Yo Xo Yo... When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence Abutment and fillet dimensions Pat cente dimensions numbe mm kg mm Single-ow da Db as l 2 a (appox.) d D2 min max max min S-2LA-HSLC S-2LA-HSLC S-2LA-HSL2C S-2LA-HSLC S-2LA-HSLC S-2LA-HSLC S-2LA-HSLC S-2LA-HSLC S-2LA-HSLC S-2LA-HSL9C S-2LA-HSL2C S-2LA-HSL2C S-2LA-HSL22C S-2LA-HSL2C S-2LA-HSL2C

148 Main Spindle Beaings Eco-fiendly angula contact ball beaings (ceamic ball type) S-2LA-HSL seies Contact angle 2 d mm B D ddd2 a Pat Bounday dimensions Basic load atings Static axial Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min - oil d D B s min s min C Co C Co lubication S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL Minimum allowable value fo cone adius dimension o. 2 Fo the details of space dimensions, please contact NTN Engineeing.

149 Main Spindle Beaings l as as da Db Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo..2. When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence Abutment and fillet dimensions Pat cente dimensions numbe mm kg mm Single-ow da Db as l 2 a (appox.) d D2 min max max min S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL2

150 Main Spindle Beaings Eco-fiendly angula contact ball beaings (ceamic ball type) S-2LA-HSL seies Contact angle 2 d mm B D ddd2 a Pat Bounday dimensions Basic load atings Static axial Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min - oil d D B s min s min C Co C Co lubication S-2LA-HSLAD.... S-2LA-HSLAD S-2LA-HSL2AD S-2LA-HSLAD S-2LA-HSLAD S-2LA-HSLAD S-2LA-HSLAD S-2LA-HSLAD S-2LA-HSLAD S-2LA-HSL9AD S-2LA-HSL2AD S-2LA-HSL2AD S-2LA-HSL22AD S-2LA-HSL2AD S-2LA-HSL2AD Minimum allowable value fo cone adius dimension o. 2 Fo the details of space dimensions, please contact NTN Engineeing.

151 Main Spindle Beaings l as as da Db Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo... When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence Abutment and fillet dimensions Pat cente dimensions numbe mm kg mm Single-ow da Db as l 2 a (appox.) d D2 min max max min S-2LA-HSLAD S-2LA-HSLAD S-2LA-HSL2AD S-2LA-HSLAD S-2LA-HSLAD S-2LA-HSLAD S-2LA-HSLAD S-2LA-HSLAD S-2LA-HSLAD S-2LA-HSL9AD S-2LA-HSL2AD S-2LA-HSL2AD S-2LA-HSL22AD S-2LA-HSL2AD S-2LA-HSL2AD

152 Main Spindle Beaings Eco-fiendly angula contact ball beaings (ceamic ball type) S-2LA-HSFL seies Contact angle 2 d mm B D d d D2 a Pat Bounday dimensions Basic load atings Static axial Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min - oil d D B s min s min C Co C Co lubication S-2LA-HSFLAD...2. S-2LA-HSFLAD S-2LA-HSFL2AD S-2LA-HSFLAD S-2LA-HSFLAD S-2LA-HSFLAD S-2LA-HSFLAD S-2LA-HSFLAD S-2LA-HSFLAD S-2LA-HSFL9AD S-2LA-HSFL2AD Minimum allowable value fo cone adius dimension o. 2 Fo the details of space dimensions, please contact NTN Engineeing.

153 Main Spindle Beaings l as as da Db Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo... When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence Abutment and fillet dimensions Pat cente dimensions numbe mm kg mm Single-ow da Db as l 2 a (appox.) d D2 min max max min S-2LA-HSFLAD S-2LA-HSFLAD S-2LA-HSFL2AD S-2LA-HSFLAD S-2LA-HSFLAD S-2LA-HSFLAD S-2LA-HSFLAD S-2LA-HSFLAD S-2LA-HSFLAD S-2LA-HSFL9AD S-2LA-HSFL2AD 9

154 Main Spindle Beaings Sealed standad angula contact ball beaings (steel ball type) 9 LLB seies Contact angle d mm B D D dd a Pat Bounday dimensions Basic load atings Static axial Facto Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min - gease d D B s min s min C Co C Co fo lubication 9CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB Minimum allowable value fo cone adius dimension o.

155 Main Spindle Beaings as as dadb as as da Da Dynamic equivalent adial load PXFYFa Single ow / Tandem Back-to-back / Face-to-face ifofa e FaFe FaFe FaFe FaFe Co X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo...92 When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence Abutment and fillet dimensions Pat cente dimensions numbe mm kg mm Single-ow da Da Db as as a (appox.) d D min max max max max CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB

156 Main Spindle Beaings Sealed standad angula contact ball beaings (steel ball type) 9 LLB seies Contact angle 2 d mm B D D dd a Pat Bounday dimensions Basic load atings Static axial Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min - gease d D B s min s min C Co C Co lubication 9ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB Minimum allowable value fo cone adius dimension o. 2

157 Main Spindle Beaings as as as dadb as da Da Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo... When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence Abutment and fillet dimensions Pat cente dimensions numbe mm kg mm Single-ow da Da Db as as a (appox.) d D min max max max max ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB

158 Main Spindle Beaings Sealed standad angula contact ball beaings (steel ball type) LLB seies Contact angle d mm B D D dd a Pat Bounday dimensions Basic load atings Static axial Facto Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min - gease d D B s min s min C Co C Co fo lubication CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB Minimum allowable value fo cone adius dimension o.

159 Main Spindle Beaings as as dadb as as da Da Dynamic equivalent adial load PXFYFa Single ow / Tandem Back-to-back / Face-to-face ifofa e FaFe FaFe FaFe FaFe Co X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo...92 When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence Abutment and fillet dimensions Pat cente dimensions numbe mm kg mm Single-ow da Da Db as as a (appox.) d D min max max max max CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB

160 Main Spindle Beaings Sealed standad angula contact ball beaings (steel ball type) LLB seies Contact angle 2 d mm B D D dd a Pat Bounday dimensions Basic load atings Static axial Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min - gease d D B s min s min C Co C Co lubication ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB Minimum allowable value fo cone adius dimension o.

161 Main Spindle Beaings as as as dadb as da Da Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo... When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence Abutment and fillet dimensions Pat cente dimensions numbe mm kg mm Single-ow da Da Db as as a (appox.) d D min max max max max ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB

162 Main Spindle Beaings Sealed standad angula contact ball beaings (ceamic ball type) S-9 LLB seies Contact angle d mm B D D dd a Pat Bounday dimensions Basic load atings Static axial Facto Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min - gease d D B s min s min C Co C Co fo lubication S-9CDLLB S-9CDLLB S-92CDLLB S-9CDLLB S-9CDLLB S-9CDLLB S-9CDLLB S-9CDLLB S-9CDLLB S-99CDLLB S-9CDLLB Minimum allowable value fo cone adius dimension o.

163 Main Spindle Beaings as as dadb as as da Da Dynamic equivalent adial load PXFYFa Single ow / Tandem Back-to-back / Face-to-face ifofa e FaFe FaFe FaFe FaFe Co X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo...92 When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence Abutment and fillet dimensions Pat cente dimensions numbe mm kg mm Single-ow da Da Db as as a (appox.) d D min max max max max S-9CDLLB S-9CDLLB S-92CDLLB S-9CDLLB S-9CDLLB S-9CDLLB S-9CDLLB S-9CDLLB S-9CDLLB S-99CDLLB S-9CDLLB 9

164 Main Spindle Beaings Sealed standad angula contact ball beaings (ceamic ball type) S-9 LLB seies Contact angle 2 d mm B D D dd a Pat Bounday dimensions Basic load atings Static axial Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min - gease d D B s min s min C Co C Co lubication S-9ADLLB S-9ADLLB S-92ADLLB S-9ADLLB S-9ADLLB S-9ADLLB S-9ADLLB S-9ADLLB S-9ADLLB S-99ADLLB S-9ADLLB Minimum allowable value fo cone adius dimension o.

165 Main Spindle Beaings as as as dadb as da Da Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo... When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence Abutment and fillet dimensions Pat cente dimensions numbe mm kg mm Single-ow da Da Db as as a (appox.) d D min max max max max S-9ADLLB S-9ADLLB S-92ADLLB S-9ADLLB S-9ADLLB S-9ADLLB S-9ADLLB S-9ADLLB S-9ADLLB S-99ADLLB S-9ADLLB

166 Main Spindle Beaings Sealed standad angula contact ball beaings (ceamic ball type) S- LLB seies Contact angle d mm B D D dd a Pat Bounday dimensions Basic load atings Static axial Facto Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min - gease d D B s min s min C Co C Co fo lubication S-CDLLB S-CDLLB S-2CDLLB S-CDLLB S-CDLLB S-CDLLB S-CDLLB S-CDLLB S-CDLLB S-9CDLLB S-CDLLB Minimum allowable value fo cone adius dimension o. 2

167 Main Spindle Beaings as as dadb as as da Da Dynamic equivalent adial load PXFYFa Single ow / Tandem Back-to-back / Face-to-face ifofa e FaFe FaFe FaFe FaFe Co X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo...92 When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence Abutment and fillet dimensions Pat cente dimensions numbe mm kg mm Single-ow da Da Db as as a (appox.) d D min max max max max S-CDLLB S-CDLLB S-2CDLLB S-CDLLB S-CDLLB S-CDLLB S-CDLLB S-CDLLB S-CDLLB S-9CDLLB S-CDLLB

168 Main Spindle Beaings Sealed standad angula contact ball beaings (ceamic ball type) S- LLB seies Contact angle 2 d mm B D D dd a Pat Bounday dimensions Basic load atings Static axial Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min - gease d D B s min s min C Co C Co lubication S-ADLLB S-ADLLB S-2ADLLB S-ADLLB S-ADLLB S-ADLLB S-ADLLB S-ADLLB S-ADLLB S-9ADLLB S-ADLLB Minimum allowable value fo cone adius dimension o.

169 Main Spindle Beaings as as as dadb as da Da Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo... When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence Abutment and fillet dimensions Pat cente dimensions numbe mm kg mm Single-ow da Da Db as as a (appox.) d D min max max max max S-ADLLB S-ADLLB S-2ADLLB S-ADLLB S-ADLLB S-ADLLB S-ADLLB S-ADLLB S-ADLLB S-9ADLLB S-ADLLB

170 Main Spindle Beaings Sealed high-speed angula contact ball beaings (steel ball type) 2LA-BNS9 LLB seies Contact angle d mm B D D d2 d d a Pat Bounday dimensions Basic load atings Static axial Facto Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min - gease d D B s min s min C Co C Co fo lubication 2LA-BNS9CLLB LA-BNS9CLLB LA-BNS92CLLB LA-BNS9CLLB LA-BNS9CLLB LA-BNS9CLLB LA-BNS9CLLB LA-BNS9CLLB LA-BNS9CLLB LA-BNS99CLLB LA-BNS92CLLB Minimum allowable value fo cone adius dimension o.

171 Main Spindle Beaings as as dada as as dbda Dynamic equivalent adial load PXFYFa Single ow / Tandem Back-to-back / Face-to-face ifofa e FaFe FaFe FaFe FaFe Co X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo.2 Yo Xo Yo... When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence dimensions Abutment and fillet dimensions Pat cente numbe mm kg mm Single-ow da db Da as as a (appox.) d d2 D min min max max max LA-BNS9CLLB LA-BNS9CLLB LA-BNS92CLLB LA-BNS9CLLB LA-BNS9CLLB LA-BNS9CLLB LA-BNS9CLLB LA-BNS9CLLB LA-BNS9CLLB LA-BNS99CLLB LA-BNS92CLLB

172 Main Spindle Beaings Sealed high-speed angula contact ball beaings (steel ball type) 2LA-BNS9 LLB seies Contact angle 2 d mm B D D d2 d d a Pat Bounday dimensions Basic load atings Static axial Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min - gease d D B s min s min C Co C Co lubication 2LA-BNS9LLB LA-BNS9LLB LA-BNS92LLB LA-BNS9LLB LA-BNS9LLB LA-BNS9LLB LA-BNS9LLB LA-BNS9LLB LA-BNS9LLB LA-BNS99LLB LA-BNS92LLB Minimum allowable value fo cone adius dimension o.

173 Main Spindle Beaings as as as dada as dbda Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo..2. When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence dimensions Abutment and fillet dimensions Pat cente numbe mm kg mm Single-ow da db Da as as a (appox.) d d2 D min min max max max LA-BNS9LLB LA-BNS9LLB LA-BNS92LLB LA-BNS9LLB LA-BNS9LLB LA-BNS9LLB LA-BNS9LLB LA-BNS9LLB LA-BNS9LLB LA-BNS99LLB LA-BNS92LLB 9

174 Main Spindle Beaings Sealed high-speed angula contact ball beaings (steel ball type) 2LA-BNS9 LLB seies Contact angle 2 d mm B D D d2 d d a Pat Bounday dimensions Basic load atings Static axial Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min - gease d D B s min s min C Co C Co lubication 2LA-BNS9ADLLB LA-BNS9ADLLB LA-BNS92ADLLB LA-BNS9ADLLB LA-BNS9ADLLB LA-BNS9ADLLB LA-BNS9ADLLB LA-BNS9ADLLB LA-BNS9ADLLB LA-BNS99ADLLB LA-BNS92ADLLB Minimum allowable value fo cone adius dimension o.

175 Main Spindle Beaings as as as dada as dbda Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo... When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence dimensions Abutment and fillet dimensions Pat cente numbe mm kg mm Single-ow da db Da as as a (appox.) d d2 D min min max max max LA-BNS9ADLLB LA-BNS9ADLLB LA-BNS92ADLLB LA-BNS9ADLLB LA-BNS9ADLLB LA-BNS9ADLLB LA-BNS9ADLLB LA-BNS9ADLLB LA-BNS9ADLLB LA-BNS99ADLLB LA-BNS92ADLLB

176 Main Spindle Beaings Sealed high-speed angula contact ball beaings (steel ball type) 2LA-BNS LLB seies Contact angle d mm B D D d2 d d a Pat Bounday dimensions Basic load atings Static axial Facto Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min - gease d D B s min s min C Co C Co fo lubication 2LA-BNS9CLLB LA-BNSCLLB LA-BNSCLLB LA-BNS2CLLB LA-BNSCLLB LA-BNSCLLB LA-BNSCLLB LA-BNSCLLB LA-BNSCLLB LA-BNSCLLB LA-BNS9CLLB LA-BNS2CLLB Minimum allowable value fo cone adius dimension o. 2

177 Main Spindle Beaings as as dada as as dbda Dynamic equivalent adial load PXFYFa Single ow / Tandem Back-to-back / Face-to-face ifofa e FaFe FaFe FaFe FaFe Co X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo.2 Yo Xo Yo... When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence dimensions Abutment and fillet dimensions Pat cente numbe mm kg mm Single-ow da db Da as as a (appox.) d d2 D min min max max max LA-BNS9CLLB LA-BNSCLLB LA-BNSCLLB LA-BNS2CLLB LA-BNSCLLB LA-BNSCLLB LA-BNSCLLB LA-BNSCLLB LA-BNSCLLB LA-BNSCLLB LA-BNS9CLLB LA-BNS2CLLB

178 Main Spindle Beaings Sealed high-speed angula contact ball beaings (steel ball type) 2LA-BNS LLB seies Contact angle 2 d mm B D D d2 d d a Pat Bounday dimensions Basic load atings Static axial Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min - gease d D B s min s min C Co C Co lubication 2LA-BNS9LLB LA-BNSLLB LA-BNSLLB LA-BNS2LLB LA-BNSLLB LA-BNSLLB LA-BNSLLB LA-BNSLLB LA-BNSLLB LA-BNSLLB LA-BNS9LLB LA-BNS2LLB Minimum allowable value fo cone adius dimension o.

179 Main Spindle Beaings as as as dada as dbda Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo..2. When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence dimensions Abutment and fillet dimensions Pat cente numbe mm kg mm Single-ow da db Da as as a (appox.) d d2 D min min max max max LA-BNS9LLB LA-BNSLLB LA-BNSLLB LA-BNS2LLB LA-BNSLLB LA-BNSLLB LA-BNSLLB LA-BNSLLB LA-BNSLLB LA-BNSLLB LA-BNS9LLB LA-BNS2LLB

180 Main Spindle Beaings Sealed high-speed angula contact ball beaings (steel ball type) 2LA-BNS LLB seies Contact angle 2 d mm B D D d2 d d a Pat Bounday dimensions Basic load atings Static axial Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min - gease d D B s min s min C Co C Co lubication 2LA-BNS9ADLLB LA-BNSADLLB LA-BNSADLLB LA-BNS2ADLLB LA-BNSADLLB LA-BNSADLLB LA-BNSADLLB LA-BNSADLLB LA-BNSADLLB LA-BNSADLLB LA-BNS9ADLLB LA-BNS2ADLLB Minimum allowable value fo cone adius dimension o.

181 Main Spindle Beaings as as as dada as dbda Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo... When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence dimensions Abutment and fillet dimensions Pat cente numbe mm kg mm Single-ow da db Da as as a (appox.) d d2 D min min max max max LA-BNS9ADLLB LA-BNSADLLB LA-BNSADLLB LA-BNS2ADLLB LA-BNSADLLB LA-BNSADLLB LA-BNSADLLB LA-BNSADLLB LA-BNSADLLB LA-BNSADLLB LA-BNS9ADLLB LA-BNS2ADLLB

182 Main Spindle Beaings Sealed high-speed angula contact ball beaings (ceamic ball type) S-2LA-BNS9 LLB seies Contact angle d mm B D D d2 d d a Pat Bounday dimensions Basic load atings Static axial Facto Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min - gease d D B s min s min C Co C Co fo lubication S-2LA-BNS9CLLB S-2LA-BNS9CLLB S-2LA-BNS92CLLB S-2LA-BNS9CLLB S-2LA-BNS9CLLB S-2LA-BNS9CLLB S-2LA-BNS9CLLB S-2LA-BNS9CLLB S-2LA-BNS9CLLB S-2LA-BNS99CLLB S-2LA-BNS92CLLB Minimum allowable value fo cone adius dimension o.

183 Main Spindle Beaings as as dada as as dbda Dynamic equivalent adial load PXFYFa Single ow / Tandem Back-to-back / Face-to-face ifofa e FaFe FaFe FaFe FaFe Co X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo.2 Yo Xo Yo... When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence dimensions Abutment and fillet dimensions Pat cente numbe mm kg mm Single-ow da db Da as as a (appox.) d d2 D min min max max max S-2LA-BNS9CLLB S-2LA-BNS9CLLB S-2LA-BNS92CLLB S-2LA-BNS9CLLB S-2LA-BNS9CLLB S-2LA-BNS9CLLB S-2LA-BNS9CLLB S-2LA-BNS9CLLB S-2LA-BNS9CLLB S-2LA-BNS99CLLB S-2LA-BNS92CLLB 9

184 Main Spindle Beaings Sealed high-speed angula contact ball beaings (ceamic ball type) S-2LA-BNS9 LLB seies Contact angle 2 d mm B D D d2 d d a Pat Bounday dimensions Basic load atings Static axial Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min - gease d D B s min s min C Co C Co lubication S-2LA-BNS9LLB S-2LA-BNS9LLB S-2LA-BNS92LLB S-2LA-BNS9LLB S-2LA-BNS9LLB S-2LA-BNS9LLB S-2LA-BNS9LLB.... S-2LA-BNS9LLB S-2LA-BNS9LLB S-2LA-BNS99LLB S-2LA-BNS92LLB Minimum allowable value fo cone adius dimension o.

185 Main Spindle Beaings as as as dada as dbda Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo..2. When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence dimensions Abutment and fillet dimensions Pat cente numbe mm kg mm Single-ow da db Da as as a (appox.) d d2 D min min max max max S-2LA-BNS9LLB S-2LA-BNS9LLB S-2LA-BNS92LLB S-2LA-BNS9LLB S-2LA-BNS9LLB S-2LA-BNS9LLB S-2LA-BNS9LLB S-2LA-BNS9LLB S-2LA-BNS9LLB S-2LA-BNS99LLB S-2LA-BNS92LLB

186 Main Spindle Beaings Sealed high-speed angula contact ball beaings (ceamic ball type) S-2LA-BNS9 LLB seies Contact angle 2 d mm B D D d2 d d a Pat Bounday dimensions Basic load atings Static axial Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min - gease d D B s min s min C Co C Co lubication S-2LA-BNS9ADLLB S-2LA-BNS9ADLLB S-2LA-BNS92ADLLB S-2LA-BNS9ADLLB S-2LA-BNS9ADLLB S-2LA-BNS9ADLLB S-2LA-BNS9ADLLB S-2LA-BNS9ADLLB S-2LA-BNS9ADLLB S-2LA-BNS99ADLLB S-2LA-BNS92ADLLB Minimum allowable value fo cone adius dimension o. 2

187 Main Spindle Beaings as as as dada as dbda Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo... When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence dimensions Abutment and fillet dimensions Pat cente numbe mm kg mm Single-ow da db Da as as a (appox.) d d2 D min min max max max S-2LA-BNS9ADLLB S-2LA-BNS9ADLLB S-2LA-BNS92ADLLB S-2LA-BNS9ADLLB S-2LA-BNS9ADLLB S-2LA-BNS9ADLLB S-2LA-BNS9ADLLB S-2LA-BNS9ADLLB S-2LA-BNS9ADLLB S-2LA-BNS99ADLLB S-2LA-BNS92ADLLB

188 Main Spindle Beaings Sealed high-speed angula contact ball beaings (ceamic ball type) S-2LA-BNS LLB seies Contact angle d mm B D D d2 d d a Pat Bounday dimensions Basic load atings Static axial Facto Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min - gease d D B s min s min C Co C Co fo lubication S-2LA-BNS9CLLB S-2LA-BNSCLLB S-2LA-BNSCLLB S-2LA-BNS2CLLB S-2LA-BNSCLLB S-2LA-BNSCLLB S-2LA-BNSCLLB S-2LA-BNSCLLB S-2LA-BNSCLLB S-2LA-BNSCLLB S-2LA-BNS9CLLB S-2LA-BNS2CLLB Minimum allowable value fo cone adius dimension o.

189 Main Spindle Beaings as as dada as as dbda Dynamic equivalent adial load PXFYFa Single ow / Tandem Back-to-back / Face-to-face ifofa e FaFe FaFe FaFe FaFe Co X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo.2 Yo Xo Yo... When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence dimensions Abutment and fillet dimensions Pat cente numbe mm kg mm Single-ow da db Da as as a (appox.) d d2 D min min max max max S-2LA-BNS9CLLB S-2LA-BNSCLLB S-2LA-BNSCLLB S-2LA-BNS2CLLB S-2LA-BNSCLLB S-2LA-BNSCLLB S-2LA-BNSCLLB S-2LA-BNSCLLB S-2LA-BNSCLLB S-2LA-BNSCLLB S-2LA-BNS9CLLB S-2LA-BNS2CLLB

190 Main Spindle Beaings Sealed high-speed angula contact ball beaings (ceamic ball type) S-2LA-BNS LLB seies Contact angle 2 d mm B D D d2 d d a Pat Bounday dimensions Basic load atings Static axial Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min - gease d D B s min s min C Co C Co lubication S-2LA-BNS9LLB S-2LA-BNSLLB S-2LA-BNSLLB S-2LA-BNS2LLB S-2LA-BNSLLB S-2LA-BNSLLB S-2LA-BNSLLB S-2LA-BNSLLB S-2LA-BNSLLB S-2LA-BNSLLB S-2LA-BNS9LLB S-2LA-BNS2LLB Minimum allowable value fo cone adius dimension o.

191 Main Spindle Beaings as as as dada as dbda Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo..2. When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence dimensions Abutment and fillet dimensions Pat cente numbe mm kg mm Single-ow da db Da as as a (appox.) d d2 D min min max max max S-2LA-BNS9LLB S-2LA-BNSLLB S-2LA-BNSLLB S-2LA-BNS2LLB S-2LA-BNSLLB S-2LA-BNSLLB S-2LA-BNSLLB S-2LA-BNSLLB S-2LA-BNSLLB S-2LA-BNSLLB S-2LA-BNS9LLB S-2LA-BNS2LLB

192 Main Spindle Beaings Sealed high-speed angula contact ball beaings (ceamic ball type) S-2LA-BNS LLB seies Contact angle 2 d mm B D D d2 d d a Pat Bounday dimensions Basic load atings Static axial Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min - gease d D B s min s min C Co C Co lubication S-2LA-BNS9ADLLB S-2LA-BNSADLLB S-2LA-BNSADLLB S-2LA-BNS2ADLLB S-2LA-BNSADLLB S-2LA-BNSADLLB S-2LA-BNSADLLB S-2LA-BNSADLLB S-2LA-BNSADLLB S-2LA-BNSADLLB S-2LA-BNS9ADLLB S-2LA-BNS2ADLLB Minimum allowable value fo cone adius dimension o.

193 Main Spindle Beaings as as as dada as dbda Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo... When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence dimensions Abutment and fillet dimensions Pat cente numbe mm kg mm Single-ow da db Da as as a (appox.) d d2 D min min max max max S-2LA-BNS9ADLLB S-2LA-BNSADLLB S-2LA-BNSADLLB S-2LA-BNS2ADLLB S-2LA-BNSADLLB S-2LA-BNSADLLB S-2LA-BNSADLLB S-2LA-BNSADLLB S-2LA-BNSADLLB S-2LA-BNSADLLB S-2LA-BNS9ADLLB S-2LA-BNS2ADLLB 9

194 Main Spindle Beaings Angula contact ball beaings fo motos and lathes (steel ball type) BNT9 seies Contact angle d mm B D Dd2 d d a Pat Bounday dimensions Basic load atings Static axial Facto Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min - gease oil d D B s min s min C Co C Co fo lubication lubication BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT Minimum allowable value fo cone adius dimension o. 9

195 Main Spindle Beaings as as dada as as dbda Dynamic equivalent adial load PXFYFa Single ow / Tandem Back-to-back / Face-to-face ifofa e FaFe FaFe FaFe FaFe Co X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo.2 Yo Xo Yo... When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions Pat cente fee space numbe mm cm kg mm Single-ow Single-ow da db Da as as a (appox.) (appox.) d d2 D min min max max max BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT9 9

196 Main Spindle Beaings Angula contact ball beaings fo motos and lathes (steel ball type) BNT seies Contact angle d mm B D Dd2 d d a Pat Bounday dimensions Basic load atings Static axial Facto Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min - gease oil d D B s min s min C Co C Co fo lubication lubication BNT BNT BNT BNT BNT BNT BNT BNT BNT..... BNT BNT BNT BNT BNT BNT Minimum allowable value fo cone adius dimension o. 92

197 Main Spindle Beaings as as dada as as dbda Dynamic equivalent adial load PXFYFa Single ow / Tandem Back-to-back / Face-to-face ifofa e FaFe FaFe FaFe FaFe Co X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo.2 Yo Xo Yo... When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions Pat cente fee space numbe mm cm kg mm Single-ow Single-ow da db Da as as a (appox.) (appox.) d d2 D min min max max max BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT 9

198 Main Spindle Beaings Angula contact ball beaings fo motos and lathes (steel ball type) BNT2 seies Contact angle d mm B D Dd2 d d a Pat Bounday dimensions Basic load atings Static axial Facto Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min - gease oil d D B s min s min C Co C Co fo lubication lubication BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT Minimum allowable value fo cone adius dimension o. 9

199 Main Spindle Beaings as as dada as as dbda Dynamic equivalent adial load PXFYFa Single ow / Tandem Back-to-back / Face-to-face ifofa e FaFe FaFe FaFe FaFe Co X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo.2 Yo Xo Yo... When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions Pat cente fee space numbe mm cm kg mm Single-ow Single-ow da db Da as as a (appox.) (appox.) d d2 D min min max max max BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT2 9

200 Main Spindle Beaings Angula contact ball beaings fo motos and lathes (ceamic ball type) S-BNT9 seies Contact angle d mm B D Dd2 d d a Pat Bounday dimensions Basic load atings Static axial Facto Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min - gease oil d D B s min s min C Co C Co fo lubication lubication S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT Minimum allowable value fo cone adius dimension o. 9

201 Main Spindle Beaings as as dada as as dbda Dynamic equivalent adial load PXFYFa Single ow / Tandem Back-to-back / Face-to-face ifofa e FaFe FaFe FaFe FaFe Co X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo.2 Yo Xo Yo... When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions Pat cente fee space numbe mm cm kg mm Single-ow Single-ow da db Da as as a (appox.) (appox.) d d2 D min min max max max S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT9 9

202 Main Spindle Beaings Angula contact ball beaings fo motos and lathes (ceamic ball type) S-BNT seies Contact angle d mm B D Dd2 d d a Pat Bounday dimensions Basic load atings Static axial Facto Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min - gease oil d D B s min s min C Co C Co fo lubication lubication S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT Minimum allowable value fo cone adius dimension o. 9

203 Main Spindle Beaings as as dada as as dbda Dynamic equivalent adial load PXFYFa Single ow / Tandem Back-to-back / Face-to-face ifofa e FaFe FaFe FaFe FaFe Co X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo.2 Yo Xo Yo... When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions Pat cente fee space numbe mm cm kg mm Single-ow Single-ow da db Da as as a (appox.) (appox.) d d2 D min min max max max S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT 99

204 Main Spindle Beaings Angula contact ball beaings fo motos and lathes (ceamic ball type) S-BNT2 seies Contact angle d mm B D Dd2 d d a Pat Bounday dimensions Basic load atings Static axial Facto Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min - gease oil d D B s min s min C Co C Co fo lubication lubication S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT Minimum allowable value fo cone adius dimension o. 2

205 Main Spindle Beaings as as dada as as dbda Dynamic equivalent adial load PXFYFa Single ow / Tandem Back-to-back / Face-to-face ifofa e FaFe FaFe FaFe FaFe Co X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo.2 Yo Xo Yo... When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions Pat cente fee space numbe mm cm kg mm Single-ow Single-ow da db Da as as a (appox.) (appox.) d d2 D min min max max max S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT2 2

206 22 NTN Main Spindle Beaings

207 NTN Main Spindle Beaings Main Spindle Beaings. Cylindical Rolle Beaings CONTENTS. Cylindical olle beaings 22 q Double-ow cylindical olle beaings 2 w Single-ow cylindical olle beaings 2 e Beaing designations 2 Accuacy of tapeed boe2 t Accuacy of cylindical olle beaings 2 y Radial intenal cleaance of cylindical olle beaings2 u Recommended fit of high-pecision cylindical olle beaings2 i Recommended lubication specifications 2 o Ulta high speed double ow cylindical olle beaings NNHSRT type 22! Ulta high-speed single ow cylindical olle beaings NHSRT type 2! Eco-fiendly ai-oil lubicated ulta high speed single ow cylindical olle beaings NHSLT type 2!2 Dimension tables fo cylindical olle beaings Double-ow cylindical olle beaings2 High speed single-ow cylindical olle beaings 22 Ulta high-speed single ow cylindical olle beaings22 Eco-fiendly ulta high-speed single ow cylindical olle beaings 2! Tape gage and intenal cleaance adjustment gage fo NTN pecision cylindical olle beaings 22! Dimension tables fo tape gage 22! Dimension table fo mounted intenal cleaance adjustment gage 2 2

208 NTN Main Spindle Beaings. Cylindical Rolle Beaings In a cylindical olle beaing, the olles and aceways ae in linea contact. Consequently this type of beaing can suppot a lage adial load than a point-contact ball beaing. Also, its stuctue is suitable fo high-speed opeation. A cylindical olle beaing used fo the main spindle of a machine tool can have eithe a double- o singleow configuation, and cetain vaiants have a tapeed boe so the adial intenal cleaance can be adjusted. Double-ow cylindical olle beaings Double-ow cylindical olle beaings ae available in two types, NN and NNU, and two seies, and 9. The olles in the NN type beaing ae guided by the ibs of the inne ing. The olles in the NNU type beaing ae guided by the ibs of the oute ing. Beaings ae available with eithe a tapeed boe type (which allows adjustment of adial intenal cleaance of beaing) o a standad cylindical boe. The beaings come in two types, standad type and high-speed HS type. Standad cage is machined bass. 2 Single-ow cylindical olle beaings Single-ow cylindical olle beaings ae available in two types, high-speed NHS type and ulta highspeed NHSRT type. The NHS type beaings have high-stength machined bass cages, while the NHSR type beaings have special molded esin cages, which can be used fo both gease lubication and ai-oil lubication. The eco-fiendly NHSLT type is a vaiation fom the high-speed NHSRT type beaing and can be used with ai-oil lubication only. Cylindical boe NHS type Tapeed boe Cylindical boe NHSR type Tapeed boe Cylindical boe NNU type Tapeed boe Cylindical boe NHSL type Tapeed boe Fig..2 Cylindical boe NN type Fig.. Tapeed boe 2

209 NTN Main Spindle Beaings Beaing designations NN9,, NNU9 type NN 2 HS RT K CNA P Pecision class PJIS class P2JIS class 2 PJIS class UPSpecialhighpecision Intenal cleaance codesee Table.. ExtenalconfiguationcodeKTapeedinneingboetapeatio/2 No codecylindical inne ing boe No codemachined bass boe TMolded PEEK cage. IntenalmodificationcodeNocodeStandadspecification HSHighspeedspecification Boe diamete code HSRUlta Highspeedspecification Dimension seies code Beaing type codenndouble ow with ibbed inne ing NNUDouble ow with ibbed oute ing NHS, NHSR type N 2 HSR T K CNA P Cage code TMoldedPEEKcage HSRtype No codehigh stength machined bass cage Intenalmodificationcode HSHigh speed specification HSRUlta highspeedspecification NHSL type N 2 HSL T K CNA P +TKZ Space code Eco- fiendly nozzle Cage code TPEEK esin mold cage Intenalmodificationcode Beaingtypecode NSingle ow with ibbed inne ing Accuacy of tapeed boe NTN specifies the accuacies of tapeed boes confoming with JIS Classes and 2 as shown below. Poo accuacies of the tapeed boe lead to misalignment of the inne ing, causing poo pefomance, pematue seizue and flaking. Use of a tape gauge is ecommended fo highe accuacy of the main spindle. Refe to " Handling of Beaings, Tapeed boe cylindical olle beaing and main spindle tape angle" in the Technical Data section fo moe infomation on tape angle. Table. Toleance of tape-boed beaings Unit: d Δdmp ΔdmpΔdmp (appox.) Vdp Class Class 2 Class Class 2 Class Class 2 ove incl. high low high low high low high low max Note: NTN specification d B d Theoetical tapeed boe ddmp B dmpdmp ddmp Tapeed boe having single plane mean boe diamete deviation Toleance of /2 tape angle dd B 2 VdpSingle adial plane boe diamete vaiation dmpsingle plane mean boe diamete deviation (at theoetical small end on tapeed boe) dmpsingle plane mean boe diamete deviation (at theoetical lage end on tapeed boe) BNominal inne ing width Fig.. 2

210 NTN Main Spindle Beaings Accuacy of cylindical olle beaings Table.2 Inne ings Nominal boe diamete d Deviation of mean boe diamete in a single plane Δdmp Class Class Class 2 ove incl. high low high low high low Vaiation of boe diamete in a single plane Vdsp Diamete seies 9 Diamete seies Class Class Class 2 Class Class Class 2 max max Vaiation of mean boe diamete Vdmp Class Class Class 2 max Inne ing adial unout Kia Class Class Class 2 max The toleance of boe diamete deviation Δds applicable to classes and 2 is the same as the toleance of single plane mean boe diamete deviation Δdmp Table. Oute ings Nominal boe diamete D Deviation of mean outside diamete in a single plane ΔDmp Diamete seies 9 Class Class 2 Class 2 2 ove incl. high low high low high low Vaiation of outside diamete in a single plane VDsp Diamete seies Class Class Class 2 Class Class Class 2 max max Vaiation of mean outside diamete VDmp Class Class Class 2 max Oute ing adial unout Kea Class Class Class 2 max The toleance of outside diamete deviation ΔDs applicable to classes and 2 is the same as the toleance of mean single plane outside diamete deviation ΔDmp. 2

211 NTN Main Spindle Beaings Pependiculaity of Width deviation inne ing face with espect to the boe ΔBs Sd Single beaing Class Class Class 2 Class Class Class 2 max high low high low Width vaiation VBs Unit: Class Class Class 2 max Pependiculaity of oute ing outside suface with espect to the face SD Class Class Class 2 max Width deviation ΔCs All classes Unit: Width vaiation VCs Class Class Class 2 max Identical to ΔBs elative to d on the same beaing

212 NTN Main Spindle Beaings Radial intenal cleaance of cylindical olle beaings Non-intechangeable adial intenal cleaance Two types of adial intenal cleaance ae available: non-intechangeable adial intenal cleaance fo which the combination of oute ing and inne ing cannot be changed; and intechangeable adial intenal cleaance that allows fo diffeent oute ing and inne ing combination. The cleaances listed ae common to both double-ow and the single-ow cylindical olle beaings. Fo machine components including highpecision machine tool main spindle, beaings with nonintechangeable adial intenal cleaance and a small cleaance ange ae used. If a double-low tapeed boe beaing is used and the desied mounted intenal cleaance is close to zeo, use of cleaance in the ange between C9NA and CINA is ecommended. Cylindical boe beaings with non-intechangeable adial intenal cleaance ae also available. Fo details, contact NTN Engineeing. Table. Cylindical boe beaings Unit: Nominal boe diamete d Cylindical boe beaing ove incl. min max min max min max The code fo nomal intenal cleaance is NA. Ex: NHSNA Table. Tapeed boe beaings Nominal boe diamete d 2 2 Tapeed boe beaing 2 ove incl. min max min max min max min max Unit: min max The code fo nomal intenal cleaance is "NA". Ex: NHSKNA 2 Intenal cleaances C9NA, CNA and CNA apply to beaings of JIS class o highe. 2

213 NTN Main Spindle Beaings Intechangeable adial intenal cleaance (cylindical boe) Table. Unit: Nominal boe diamete d (Nomal) ove incl. min max min max min max Adjustment of cleaance in tapeed boe beaings Mounted intenal cleaance of a tapeed boe beaing can be adjusted by contolling the dive-up of the tapeed boe onto the shaft. Two types of adjusting methods aea availableepeated adjustment of space width and adjustment with using a mounted intenal cleaance gauge. The cleaance gauge is convenient fo mass-poduction. Refe to ". Handling of Beaings, Cleaance adjustment fo cylindical olle beaing, measuement with mounted intenal cleaance gage" in the Technical Data section. 29

214 NTN Main Spindle Beaings Recommended fit of high-pecision cylindical olle beaings In ode to maintain the high pecision of a pecision beaing unde dmn value is lowe than. the fits listed in Tables. and. ae ecommended (dmn: pitch cicle diamete acoss olling elements [mm] multiplied by speed [min - ]). When the dmn value is lage than. (dmn value. ), consult NTN Engineeing about the ecommended fit. Expansion of the inne ing due to centifugal foce must be consideed when detemining shaft fit. Table. Fit with shaft Unit: Table. Fit with housing Unit: Nominal boe diamete ove d incl. Fit between inne ing and shaft Nominal boe diamete D ove incl. Fit between oute ing and housing T T TT 2 T T T TT 2TT 2TT 2 2 T T T 2 Note : Taget the median value. T: Tight (Intefeence) fit Not applicable to tapeed boe beaings TT TT 2 Note : Taget the median value. T: Tight (Intefeence) fit T T 9T Fit of tapeed boe beaings When fitting a tapeed boe beaing onto a shaft, caefully and thooughly adjust the fit of the tapeed boe to the shaft to maintain high pecision of the beaing. Fo details of tape angle adjustment efe to ". Handling of Beaings, Cylindical olle beaing and main spindle tape angle" in the Technical Data section. 2

215 NTN Main Spindle Beaings Recommended lubication specifications Cylindical olle beaings ae usually used with gease lubication o ai-oil lubication. Recommended lubication specifications ae descibed below. Gease lubication Recommended band of gease Refe to ". Lubication of Beaings, Gease lubication" in the Technical Data section. Recommended gease fill % of the capacity shown in the dimension tables Recommended gease packing method Refe to ". Handling of Beaings, Cleaning and filling with gease" in the Technical Data section. Ai-oil lubication Recommended location of nozzle Refe to ". Lubication of Beaings, 2 Ai-oil lubication" in the Technical Data section. Recommended specifications of nozzle Nozzle boe diamete.: Fom to. mm Numbe of nozzles: One nozzle fo each beaing, depth of nozzle boe should be fou to six times the nozzle diamete. Recommended specifications of ai-oil Oil type: Spindle oil Viscosity gade: ISO VG fom to 2 (2 is pefeable) Table..9 Ai and oil amount Beaing type NN NNHS NHS NHSRT NNHST NNHSRT NHSL dmn value ( ) Ove Incl.... Recommended ai consumption NR/min Oil amount pe shot cm Lubication inteval min NR/min (Nomal lite/minute)... NR means the volume of ai at C and atmosphee. Oil consumption cm /h

216 NTN Main Spindle Beaings 9 Ulta high speed double ow cylindical olle beaings NNHSRT type NNHSRT ulta high speed double ow cylindical olle beaings have highe opeating speed with the same level of igidity and capacity as the conventional seies. Beaing design Featues. Optimized intenal design to ealize high speed and low tempeatue ise. 2. Molded PEEK cage is used fo high speed unde gease & ai-oil lubication and gease life. Fig.. NNHSRT type Pemissible speed ange dmn value NNHSRT Gease lubication Ai-oil lubication Notes) Pemissible speed of each beaing (dmn value) vaies depending on the specifications of the machine fo which the beaing is used (moto dive system, cooling system, and constuction aound the beaing). Conside the optimal choice efeing to the above guideline and contact NTN. Cage design Cage is made of PEEK which is vey light and stong. (Photo.) Smalle defomation by the centifugal foce is ealized by the lighten cage mateial and unpoved design High speed opeation is by the cage design impovement. Gease life is extended by gease pocket in the cage. Photo. PEEK cage 22

217 NTN Main Spindle Beaings High speed test dmn value of. million unde gease lubication and. million unde ai-oil lubication ae ealized by the optimized intenal design. (Fig.,.) Test conditions Beaing Speed Mounted adial cleaance Lubication Gease type Jacket cooling NN2HSRTK NN2HSTK NN2HSK () min - m Gease lubication MP- Yes Test conditions Beaing Speed Mounted adial cleaance Lubication Oil Ai Jacket cooling NN2HSRTK NN2HSTK NN2HSK () min - m Ai- Oil lubication.2 ml/shot Oil shot inteval: 2min NL/min Yes 2 OR tempeatue ise C 2 NN2HSRTK NN2HSTK NN2HSK OR tempeatue ise C 2 2 NN2HSRTK NN2HSTK NN2HSK 2 Speedmin - Speedmin dmn value... dmn value Fig.. Compaison of tempeatue ise (gease) Fig.. Compaison of tempeatue ise (ai- oil) Gease life Ove hous continuous opeation unde gease lubication is ealized by the impoved cage design at dmn value of. million. (Fig..) Test conditions h Duation, h ove h Moe than 9 times Beaing Speed Mounted adial cleaance Lubication Gease type Jacket cooling NN2HSRTK NN2HSK () min - m Gease lubication MP- Yes Fig.. Compaison of gease life 2

218 NTN Main Spindle Beaings! Ulta high-speed single ow cylindical olle beaings NHSRT type NHSRT type cylindical olle beaings have been designed fo high-speed opeation. Beaing specification Featues. Optimized intenal design allows high speed opeation and limits tempeatue incease. 2. Special esin cage is suitable fo high-speed opeation. Fig.. NHSRT type Pemissible speed ange dmn value NHSRT Gease lubication Ai-oil lubication Notes) Pemissible speed of each beaing (dmn value) vaies depending on the specifications of the machine fo which the beaing is used (moto dive system, cooling system, and constuction aound the beaing). Conside the optimal choice efeing to the above guideline and contact NTN. Simplified main spindle configuation / adoption of simplified lubication system Due to an optimized intenal stuctue, the NHSR type beaings can eliably un at a highe speed with gease lubication. The gease lubication system geatly contibutes to eduction in pollution of the suounding envionments by vitually eliminating oil mist (Fig..9). Simplified main spindle configuation / simplified main spindle ea stuctue NHSR (NHSL) type high-speed cylindical olle beaings can eplace angula contact ball beaing on the ea side of the main spindle. This aangement deceases the numbe of beaing ows (two ows to one ow) and eliminates the ball slide mechanism, geatly contibuting to simplification of the ea stuctue (Fig..). Ai-oil lubication Gease lubication w/ ball slide mechanism w/o ball slide mechanism Capable of eplacing ai-oil lubicated beaings up to dmn value of,,. Fig..9 Modification of lubication system Capable of eplacing angula contact ball beaings up to dmn value of 2,, [ai-oil lubication] o,, [gease lubication]. Fig.. Simplified main spindle ea stuctue 2

219 NTN Main Spindle Beaings High-speed opeation test with gease lubication Due to an optimized intenal design, the NHSR type is capable of high-speed opeation with dmn value of. million [gease lubication] o 2. million [ai-oil lubication] (Figs..,.2,.,.). Test conditions Test beaing Shaft speed Mounted adial cleaance Lubication Jacket cooling NHSRT NHS (9) min - m Gease No Test conditions Test beaing Shaft speed Mounted adial cleaance Lubication Jacket cooling NHSRT NHS (9) min - m Gease Yes Tempeatue incease of oute ing C Speedmin -.. dmn value Tempeatue incease of oute ing C Speedmin -.. dmn value Fig.. High-speed test esults (gease lubication without oute case cooling) Fig..2 High-speed test esults (gease lubication with oute case cooling) Test conditions Test beaing Shaft speed Mounted adial cleaance Lubication Oil consumption Ai consumption Jacket cooling NHSRT NHS (222) 22 min - m Ai-oil lubication.2 ml/shot (oil shot intevals, min) NL/min No Test conditions Test beaing Shaft speed Mounted adial cleaance Lubication Oil consumption Ai consumption Jacket cooling NHSRT NHS (222) 22 min - m Ai-oil lubication.2 ml/shot (oil shot intevals, min) NL/min Yes Tempeatue incease of oute ing C 2 Tempeatue incease of oute ing C Speedmin dmn value 2 2 Speedmin dmn value Fig.. High-speed test esults (ai-oil lubication without jacket cooling) Fig.. High-speed test esults (ai-oil lubication with jacket cooling) 2

220 NTN Main Spindle Beaings! Eco-fiendly ai-oil lubicated cylindical olle beaings NHSLT type The eco-fiendly ai-oil lubicated NHSLT type was developed by applying NTN's unique ecoconscious technology to the poven NHSRT type beaing design. The NHSLT type boasts limited emission of oil mist and educed ai and oil consumption. This impoves opeating envionments, saves enegy while allowing highe-speed machining opeation. Beaing specification Ai-oil Ai-oil Eco-fiendly nozzle Intenal specification of NHSRT type Eco-fiendly specification Featues. Optimized intenal design allows high speed opeation and limits tempeatue incease. 2. Adoption of the eco-fiendly nozzle design has led to: Lowe noise level (up to dba) % eduction in ai consumption % eduction in oil consumption. NHS type (conventional beaing type) ULTAGE NHSLT type NOTE) The NHSLT type is deliveed as packed togethe with the space with the eco-fiendly nozzle. The beaing type code NHSLT epesents the beaing pope, while a space code stands fo an eco-fiendly nozzle pope o a space having a built-in nozzle. Fo moe details, see Beaing Designations. Fig.. NHSLT type Pemissible speed ange dmn value NHSLT Notes) Pemissible speed of each beaing (dmn value) vaies depending on the specifications of the machine fo which the beaing is used (moto dive system, cooling system, and constuction aound the beaing). Conside the optimal choice efeing to the above guideline and contact NTN. High-speed unning test Even with deceased ai consumption and oil consumption, the NHSL type beaings can eliably opeate at high speed of dmn 2. (Fig..,.). Test conditions Test beaing Shaft speed Mounted adial cleaance Oil consumption Ai consumption Jacket cooling NHSLT NHS (222) 22 min - m.2 ml/shot NHS NHSL NHS NHSL No min intevals min intevals NL/min 2 NL/min Test conditions Test beaing Shaft speed Mounted adial cleaance Oil consumption Ai consumption Jacket cooling NHSLT NHS (222) 2 min - m.2 ml/shot NHS NHSL NHS NHSL Yes min intevals min intevals NL/min 2 NL/min Tempeatue incease of oute ing C 2 Tempeatue incease of oute ing C Shaft speedmin dmn value Fig.. Hgh-speed test esults (without Jacket cooling) 2 2 Shaft speedmin dmn value Fig.. High-speed test esults (with Jacket cooling) 2

221 NTN Main Spindle Beaings 2

222 Main Spindle Beaings!2 Dimension tables fo double ow cylindical olle beaings Double ow cylindical olle beaings d 29mm B B D d FW d D Ew d d NNU Type Cylindical boe Tapeed boe NN Type Cylindical boe Tapeed boe Pat numbe Bounday Basic load atings Limiting speeds dimensions dynamic static dynamic static NNU Type NN Type mm kn kgf min - cylindical tapeed cylindical tapeed gease oil boe boe boe boe d D B s min 2 C Co C Co lubication lubication NN NNK NNHS NNHSK NN NNK NNHS NNHSK NN NNK NNHS NNHSK NN NNK NNHS NNHSK NN9 NN9K NN9HS NN9HSK NN NNK NNHS NNHSK NN NNK NNHS NNHSK NN2 NN2K NN2HS NN2HSK NN NNK NNHST NNHSTK NNHSRT NNHSRTK NN NNK NNHST NNHSTK NNHSRT NNHSRTK NN NNK NNHST NNHSTK NNHSRT NNHSRTK NN NNK NNHST NNHSTK NNHSRT NNHSRTK NN NNK NNHST NNHSTK. 2 9 NNHSRT NNHSRTK NN NNK NNHST NNHSTK NNHSRT NNHSRTK NN9 NN9K A beaing numbe with suffix K indicates a tapeed-boe beaing (tape atio /2). 2 Minimum allowable value fo cone adius dimension. 2

223 Main Spindle Beaings a a a a a Da dc da dd Db da Db Db da db Dynamic equivalent adial load P=F Static equivalent adial load Po=F Dimensions Abutment and fillet dimensions Mass Intenal kg (appox.) fee space mm mm NNU Type NN Type cm da db dc dd Da Db as cylindical tapeed cylindical tapeed NN Fw Ew min min max min max max min max boe boe boe boe Type

224 Main Spindle Beaings Double ow cylindical olle beaings d 9mm B B D d FW d D Ew d d NNU Type Cylindical boe Tapeed boe NN Type Cylindical boe Tapeed boe Pat numbe Bounday Basic load atings Limiting speeds dimensions dynamic static dynamic static NNU Type NN Type mm kn kgf min - cylindical tapeed cylindical tapeed gease oil boe boe boe boe d D B s min 2 C Co C Co lubication lubication NNU92 NNU92K NN92 NN92K NN2 NN2K. 2 2 NN2HST NN2HSTK NN2HSRT NN2HSRTK NNU92 NNU92K NN92 NN92K NN2 NN2K NN2HST NN2HSTK NN2HSRT NN2HSRTK NNU922 NNU922K NN922 NN922K NN22 NN22K NN22HST NN22HSTK NN22HSRT NN22HSRTK NNU92 NNU92K NN92 NN92K 2. NN2 NN2K NN2HST NN2HSTK NN2HSRT NN2HSRTK NNU92 NNU92K NN92 NN92K NN2 NN2K NN2HST NN2HSTK NN2HSRT NN2HSRTK NNU92 NNU92K NN92 NN92K NN2 NN2K NN2HS NN2HSK NNU9 NNU9K NN9 NN9K NN NNK NNHS NNHSK NNU92 NNU92K NN92 NN92K 22 2 NN2 NN2K NN2HS NN2HSK 2 2. NNU9 NNU9K NN9 NN9K 2 2 NN NNK NNU9 NNU9K NN9 NN9K NN NNK NNU9 NNU9K NN9 NN9K NN NNK A beaing numbe with suffix K indicates a tapeed-boe beaing (tape atio /2). 2 Minimum allowable value fo cone adius dimension. 22

225 Main Spindle Beaings a a a a a Da dc da dd Db da Db Db da db Dynamic equivalent adial load P=F Static equivalent adial load Po=F Dimensions Abutment and fillet dimensions Mass Intenal kg (appox.) fee space mm mm NNU Type NN Type cm da db dc dd Da Db as cylindical tapeed cylindical tapeed NN Fw Ew min min max min max max min max boe boe boe boe Type

226 Main Spindle Beaings Double ow cylindical olle beaings d 2mm B B D d FW d D Ew d d NNU Type Cylindical boe Tapeed boe NN Type Cylindical boe Tapeed boe Pat numbe Bounday Basic load atings Limiting speeds dimensions dynamic static dynamic static NNU Type NN Type mm kn kgf min - cylindical tapeed cylindical tapeed gease oil boe boe boe boe d D B s min 2 C Co C Co lubication lubication NNU9 NNU9K NN9 NN9K NN NNK NNU9 NNU9K NN9 NN9K NN NNK NNU9 NNU9K NN9 NN9K NN NNK NNU92 NNU92K NN92 NN92K NN2 NN2K NNU9 NNU9K NN9 NN9K NN NNK NNU9 NNU9K NN9 NN9K NN NNK NNU9 NNU9K NN9 NN9K NN NNK NNU9 NNU9K 2 2 NN NNK NNU92 NNU92K 29 2 NN2 NN2K 9 NNU9 NNU9K 2 NN NNK 9 2 NNU9 NNU9K 9 2 NN NNK NNU9 NNU9K 2 2 NN NNK NNU9 NNU9K 2 29 NN NNK NNU992 NNU992K NN92 NN92K NNU99 NNU99K NNU9/ NNU9/K A beaing numbe with suffix K indicates a tapeed-boe beaing (tape atio /2). 2 Minimum allowable value fo cone adius dimension. 222

227 Main Spindle Beaings a a a a a Da dc da dd Db da Db Db da db Dynamic equivalent adial load P=F Static equivalent adial load Po=F Dimensions Abutment and fillet dimensions Mass Intenal kg (appox.) fee space mm mm NNU Type NN Type cm da db dc dd Da Db as cylindical tapeed cylindical tapeed NN Fw Ew min min max min max max min max boe boe boe boe Type

228 Main Spindle Beaings High speed single ow cylindical olle beaings d mm B B Ew d D Ew d D Cylindical boe Tapeed boe Pat numbe Bounday dimensions Basic load atings Limiting speeds dynamic static dynamic static kn kgf min - cylindical tapeed gease oil boe boe d D B s min 2 s min 2 Ew C Co C Co lubication lubication NHS NHSK NHS NHSK NHS NHSK N9HS N9HSK NHS NHSK NHS NHSK N2HS N2HSK NHS NHSK NHS NHSK NHS NHSK NHS NHSK A beaing numbe with suffix K indicates a tapeed-boe beaing (tape atio /2). 2 Minimum allowable value fo chamfe dimension o. NHS diffes fom standad N in intenal constuction. 22

229 Main Spindle Beaings a a Db da Db Dynamic equivalent adial load P=F Static equivalent adial load Po=F Abutment and Mass Intenal Pat numbe fillet dimensions cylindical fee space mm boe cm da Db as as kg cylindical tapeed min max min max max (appox.) boe boe 9... NHS NHSK..9. NHS NHSK NHS NHSK N9HS N9HSK..2. NHS NHSK NHS NHSK.... N2HS N2HSK NHS NHSK NHS NHSK NHS NHSK.... NHS NHSK 22

230 Main Spindle Beaings High speed single ow cylindical olle beaings d mm B B Ew d D Ew d D Cylindical boe Tapeed boe Pat numbe Bounday dimensions Basic load atings Limiting speeds dynamic static dynamic static kn kgf min - cylindical tapeed gease oil boe boe d D B s min 2 s min 2 Ew C Co C Co lubication lubication NHS NHSK NHS NHSK N9HS N9HSK N2HS N2HSK N2HS N2HSK N22HS N22HSK N2HS N2HSK N2HS N2HSK N2HS N2HSK NHS NHSK N2HS N2HSK A beaing numbe with suffix K indicates a tapeed-boe beaing (tape atio /2). 2 Minimum allowable value fo chamfe dimension o. NHS diffes fom standad N in intenal constuction. 22

231 Main Spindle Beaings a a Db da Db Dynamic equivalent adial load P=F Static equivalent adial load Po=F Abutment and Mass Intenal Pat numbe fillet dimensions cylindical fee space mm boe cm da Db as as kg cylindical tapeed min max min max max (appox.) boe boe NHS NHSK NHS NHSK... N9HS N9HSK N2HS N2HSK N2HS N2HSK N22HS N22HSK N2HS N2HSK N2HS N2HSK N2HS N2HSK NHS NHSK N2HS N2HSK 22

232 Main Spindle Beaings Ulta high-speed single ow cylindical olle beaings (ULTAGE seies) d mm B B Ew d D Ew d D Cylindical boe Tapeed boe Pat numbe Bounday dimensions Basic load atings Limiting speeds dynamic static dynamic static kn kgf min - cylindical tapeed gease oil boe boe d D B s min 2 s min 2 Ew C Co C Co lubication lubication NHSRT NHSRTK N2HSRT N2HSRTK NHSRT NHSRTK NHSRT NHSRTK NHSRT NHSRTK NHSRT NHSRTK N2HSRT N2HSRTK Minimum allowable value fo chamfe dimension o. 22

233 Main Spindle Beaings a a da Db Dynamic equivalent adial load P=F Static equivalent adial load Po=F Abutment and Intenal Pat numbe fillet dimensions fee space mm cm da Db as as cylindical tapeed min max min max max boe boe.. 2. NHSRT NHSRTK... N2HSRT N2HSRTK NHSRT NHSRTK.. 2. NHSRT NHSRTK... NHSRT NHSRTK NHSRT NHSRTK N2HSRT N2HSRTK 229

234 Main Spindle Beaings Eco-fiendly ulta high-speed single ow cylindical olle beaings (ULTAGE seies) Ai-oil lubication only d mm B B Ew d D Ew d D Cylindical boe Tapeed boe Pat numbe Bounday dimensions Basic load atings Limiting speeds dynamic static dynamic static kn kgf min - cylindical tapeed gease boe boe d D B s min s min Ew C Co C Co lubication NHSLT NHSLTK N2HSLT N2HSLTK NHSLT NHSLTK NHSLT NHSLTK NHSLT NHSLTK NHSLT NHSLTK N2HSLT N2HSLTK Minimum allowable value fo chamfe dimension o. 2 Fo the details of space dimensions, please contact NTN Engineeing. 2

235 Main Spindle Beaings a a da Db Dynamic equivalent adial load P=F Static equivalent adial load Po=F Abutment and Pat numbe fillet dimensions mm da Db as as 2 cylindical tapeed min max min max max min boe boe.. 2. NHSLT NHSLTK... N2HSLT N2HSLTK NHSLT NHSLTK.. NHSLT NHSLTK.. NHSLT NHSLTK NHSLT NHSLTK 2 9. N2HSLT N2HSLTK 2

236 Main Spindle Beaings! Tape gage and intenal cleaance adjustment gage fo NTN pecision cylindical olle beaings As the need inceases fo machine tools of highe speed and pecision, a highe degee of pecision is equied of machine tool beaings. Fo a pecision beaing to exhibit its full pefomance, it must be installed coectly. In paticula, when a tapeed boe beaing is used, the coesponding tape on the shaft must be finished to a high degee of pecision. NTN ecommends the ing gage fo the tapeed shaft be finished to the same pecision as fo beaings. Note that the contact aea between tapeed faces should be % o geate. NTN also offes a plug gage that pemits veification of the pecision of the ing gage. Remembe that the adial intenal cleaance of a cylindical olle beaing needs to be coectly adjusted. Too lage a adial cleaance can diminish the pecision of the main spindle, while too small a adial cleaance can lead to abnomal heat geneation and pematue flaking of the beaing. To ensue adequate intenal cleaance, use a mounted intenal cleaance adjustment gage.! Dimension table fo tape gage Pat numbe Applicable beaing Bounday dimensions Mass (appox.) mm kg type type Plug gage Ring gage d d D B TB TA TANNK TBNNK NHS NNK TANNK TBNNK NHS NNK. 2.. TANNK TBNNK NHS NNK. 2.. TANN9K TBNN9K N9HS NN9K TANNK TBNNK NHS NNK TANNK TBNNK NHS NNK TANN2K TBNN2K N2HS NN2K TANNK TBNNK NHS NNK TANNK TBNNK NHS NNK 2... TANNK TBNNK NHS NNK... TANNK TBNNK NHS NNK TANNK TBNNK NHS NNK TANNK TBNNK NHS NNK TANN9K TBNN9K N9HS NN9K TANN2K TBNN2K N2HS NN2K TANN2K TBNN2K N2HS NN2K... TANN22K TBNN22K N22HS NN22K... TANN2K TBNN2K N2HS NN2K TANN2K TBNN2K N2HS NN2K. 2.. TANN2K TBNN2K N2HS NN2K TANNK TBNNK NHS NNK TANN2K TBNN2K N2HS NN2K. 22. d B d Tape /2 Plug gage (TA) B Tape /2 D d d Ring gage (TB) 22

237 Main Spindle Beaings! Dimension table fo mounted intenal cleaance adjustment gage Pat Applicable beaing Bounday numbe dimensions mm E D width B SBNN-2 NHSK NNK 2 SBNN-2 NHSK NNK 2 SBNN9-2 N9HSK NN9K. 2 SBNN-2 NHSK NNK SBNN-2 NHSK NNK 2 SBNN2-2 N2HSK NN2K. 2 SBNN-2 NHSK NNK 9 2 SBNN-2 NHSK NNK 2 SBNN-2 NHSK NNK 2 SBNN-2 NHSK NNK SBNN-2 NHSK NNK SBNN-2 NHSK NNK 2 9 SBNN9-2 N9HSK NN9K 2 2 SBNN2-2 N2HSK NN2K 2 SBNN2-2 N2HSK NN2K 22 SBNN22-2 N22HSK NN22K 2 SBNN2-2 N2HSK NN2K 2 SBNN2-2 N2HSK NN2K 2 2 SBNN2-2 N2HSK NN2K 92 2 SBNN-2 NHSK NNK 2 SBNN2-2 N2HSK NN2K

238 NTN Main Spindle Beaings

239 NTN Main Spindle Beaings Main Spindle Beaings. Angula Contact Ball Beaings fo Axial Loads CONTENTS. Angula Contact Ball Beaings fo Axial Loads 229 q Featues and types 2 w Standad cage types 2 e Beaing designations 2 Accuacy of double-diection angula contact thust ball beaings 2 t Accuacy of high-speed duplex angula contact ball beaings fo axial loads 29 y Basic peload2 u Shaft and housing fits 2 i Recommended lubication specifications 2 o Angula contact ball beaings fo axial loads HTA U type22! Dimension tables Double-diection angula contact thust ball beaings 2 Angula contact ball beaings fo axial loads 2 2

240 NTN Main Spindle Beaings. Angula Contact Ball Beaings fo Axial Loads Featues and types NTN povides a ange of thust beaings fo the main spindles. This includes 29 and 2 seies fo high axial igidity (contact angle ) and HTA U(A) seies high-speed duplex angula contact ball beaings fo axial loads with optimized intenal design (contact angle, ). These beaings ae used in conjunction with NN, NN9, o NNU9 seies double-ow cylindical olle beaings (matched beaings must have the same boe and outside diamete). Table. Types of angula contact ball beaings fo axial loads 29 and 2 seies HTAU (A)..DB, HTA9U (A)..DB seies Beaing type Initial contact angle Cage mateial Featues High-stength machined bass cage These seies can withstand axial loads in both diections. Due to a lage contact angle, igidity in axial diections is enhanced. The stuctue of these beaings limits them to gease-lubicated vetical shaft applications. Molded esin, machined phenolic, high-stength machined coppe alloy cage These duplex angula contact ball beaing seies have simila design to the double-ow thust angula contact ball beaing seies, but ae diffeent in tems of thei widths (see the diagams below). Since thei contact angles ae lowe at and, the seies boast highspeed capability. Howeve, thei axial igidity is less than double-ow thust angula contact ball beaings with contact angle. A double-diection thust angula contact ball beaing can be eadily intechanged with a duplex angula contact ball beaing simply by eplacing space C with space D; the dimensions of the shaft and housing emain unchanged. Dimension A = Dimension 2B A Space C 2B Space D Intechangeability Double-diection thust angula contact ball beaing 29 seies 2 seies High-speed duplex angula contact ball beaing fo axial loads HTA9UDB seies HTBUDB seies 2

241 NTN Main Spindle Beaings 2 Standad cage types Table.2 Standad cage of angula contact ball beaing fo axial loads Beaing seies 29 2 HTA9U (A) HTAU (A) Machined phenol cage HTA92HTA9U HTAHTAU Machined bass cage HTA9UHTA9U HTAUHTAU Notes: Cage types may be subjected to change without notice. Fo details, contact NTN Engineeing. Beaing designations 2 2M / GN P Toleance class code P: NTN Class P: NTN Class Intenal cleaance code GN: Nomal peload GM: Medium peload Boe code (efe to the dimensions tables) without M: Tapeed shaft small side diamete type (Ex.: 22 mm boe) with M: Tapeed shaft lage side diamete type (Ex.: 22 mm boe) Dimension seies code Beaing type S - HTA 2 U A T2 DB / GN PL Toleance class code P: JIS Class P: JIS Class L: Oute ing outside diamete toleance fo axial load Intenal cleaance code GN: Nomal peload GM: Medium peload Duplex aangement code DB: back-to-back (double-ow) DTBT: tandem back-to-back (fou-ow) Cage code No code: Standad cage T2: Molded esin L: Machined bass cage Contact angle code No code: A: Beaing seies: ULTAGE Nominal boe diamete (see the dimensions tables) Dimension seies code Beaing type Mateial code S: Mateial of olling element is ceamics No code: Beaing steel 2

242 NTN Main Spindle Beaings Accuacy of double-diection angula contact thust ball beaings Table. Inne ings Unit: Nominal boe diamete d ove incl. Single plane mean boe diamete deviation Δdmp o boe diamete deviation Δds Class Class high low high low Pependiculaity of inne ing face with espect to the boe Sd Class Class max Axial unout Sia Class Class max Width vaiation VBs Beaing height deviation ΔTs Class Class Class Class max high low Table. Oute ings Nominal boe diamete D ove incl Single plane mean outside diamete deviation ΔDmp o outside diamete deviation ΔDs Class Class high low Pependiculaity of oute ing outside suface with espect to the face SD Class Class max 9 Axial unout Sea Class Class max Identical to ΔBs elative to d of the same beaing. Unit: Width vaiation VCs Class Class max 2. 2

243 NTN Main Spindle Beaings Accuacy of high-speed duplex angula contact ball beaings fo axial loads Table. Inne ings Nominal boe diamete d ove incl Oveall width vaiation of assembled beaing ΔBs Class Class high low Single plane mean boe diamete deviation Δdmp Class Class high low high low 9 2 Width vaiation VBs Class Class max 2 Unit: Nominal boe diamete d ove incl. Single adial plane boe diamete vaiation Vdsp Diamete seies 9 Diamete seies Class Class Class Class max max Mean boe Pependiculaity of diamete deviation inne ing face with Vdmp espect to the boe Sd Class Class Class Class max max Unit: Axial unout Sia Class Class max The toleance of boe diamete deviation Δds is the same as the toleance of single plane mean boe diamete deviation Δdmp Table. Oute ings Nominal boe diamete D Single plane mean outside diamete deviation ΔDmp and outside diamete deviation ΔDs Class L o Class L 2 Class Class 2 ove incl. high low high low high low Axial unout Sea Class Class All classes Oveall width vaiation of assembled beaing ΔCs All classes Unit: Width vaiation VCs Class Class max Identical to Bs elative to d on the same beaing The toleance of outside diamete deviation ΔDs to be applied to the Class and Class 2 is same as the toleance of the mean outside diamete deviation Δdmp. Note that the Class is applicable to diamete seies and 2, and the Class 2 is applicable to all the diamete seies. Note: This standad is the NTN standad. 29

244 NTN Main Spindle Beaings Basic peload The initial intenal cleaance o initial peload must be selected with consideation of the lubicating method, maximum speed, and equied axial igidity. Although usage with nomal peload (GN) within the allowable speed ange is possible fo both gease lubication and ai-oil lubication, ask NTN Engineeing to ecommend the appopiate peload if axial igidity is equied and you want to inhibit tempeatue ise of the main spindle. The standad peloads ae summaized in Table.. Table. Basic peload Unit: Boe numbe Nomal GN Medium GM Nomal GN 2 HTA9UDB HTA9UADB HTAUDB HTAUADB Medium GM Nomal GN Medium GM Nomal GN 9 2 Medium GM Nomal GN Medium GM Nomal GN Medium GM Boe numbe

245 NTN Main Spindle Beaings Shaft and housing fits Fits given in Table. ae ecommended fo angula contact ball beaings fo axial loads. To maintain high accuacy, povision of intefeence between the shaft and the boe of inne ing is essential. The fit of the housing and beaing should be same as that fo cylindical olle beaings, since an angula contact ball beaing is nomally used togethe with a cylindical olle beaing. Checking concenticity of outside diamete of oute ing afte beaing Contolling concenticity of oute ing assembly is necessay fo eduction of axial unout of the main spindle. Measue and contol the concenticity of oute ing shown in Fig.. and ". Handling of Beaings, 2 Mounting" in the Technical Data section. Measuement of concenticity of oute ing Fig.. Concenticity Table. Fit to shaft Nominal boe diamete d ove incl Fit of inne ing to shaft 2T 2T 2.T T.T T T T Unit: Note : Taget the median value. 2: Fo high-speed applications whee dmn value exceeds., the fit should be inceased.fo such an aangement, consult NTN Engineeing. T: Tight (Intefeence) fit Recommended lubication specifications Angula contact ball beaings fo axial loads ae usually used with gease lubication o ai-oil lubication. Recommended specifications of the lubication methods ae descibed below. Gease lubication Recommended band of gease Refe to ". Lubication of Beaings, Gease lubication" in the Technical Data section. Recommended gease filling amount dmn value. % of the capacity shown in the dimensions tables dmn value. 2% of the capacity shown in the dimensions tables Recommended gease filling method Refe to ". Handling of Beaings, Cleaning and filling with gease" in the Technical Data section. Notes: High-stength machined bass cages ae used fo 29/2 seies. Thus, if they ae used fo gease-lubicated vetical shafts, the cage on one side may hang onto the olling elements, possibly causing seizue. Use of the HTA seies with esin cages o oil lubication (including feeding of lubicating oil) is ecommended. Ai-oil lubication Recommended location of nozzle Refe to ". Lubication of Beaings 2 Recommended location of nozzle fo ai-oil lubication" in the Technical Data section. Recommended specifications of nozzle Nozzle boe diamete : Fom to. mm Numbe of nozzles: One nozzle fo each beaing, depth of nozzle boe should be fou to six times of nozzle boe diamete. Recommended specifications of ai-oil Oil type: Spindle oil Viscosity gade: ISO VG fom to 2 (2 is pefeable) Table..9 Ai and oil amount Beaing types HTA9 (A) HTA (A) S-HTA (A) dmn value Ove Incl....2 Oil amount pe shot ml. Lubication Oil Recommended intevalsconsumption ai consumption min ml/h NL/min.2 2. NL/min (Nomal lite/minute) NL means the volume of ai at C and atmosphee. 2

246 NTN Main Spindle Beaings 9 Angula contact ball beaings fo axial loads HTA U type HTA U type angula contact ball beaing has a highe limiting speed with the same igidity and loading capability as the conventional HTA seies. Beaings design Featues Optimized intenal design to minimize the tempeatue ise especially at high speed ange. 2Impoved molded nylon cage pocket design whee the ball contacts to have highe lubication pefomance unde gease o ai-oil lubication. Fig..2 HTA U type Pemissible speed ange dmn value HTA9 U HTA U Gease lubication Ai-oil lubication S-HTA U Notes) Pemissible speed of each beaing (dmn value) vaies depending on the specifications of the machine fo which the beaing is used (moto dive system, cooling system, and constuction aound the beaing). Conside the optimal choice efeing to the above guideline and contact NTN. Axial igidity Axial igidity is at the same level as the conventional design. Data/Allowable axial load By eviewing the intenal stuctue, the allowable axial load has impoved ove HTA types by about. times with the contact angle of and by about.2 times with the contact angle of. Axial displacementm Condition fo study Beaing Mounted peload HTA2UADBHTA2ADB HTA2UDBHTA2DB (22.2 ow) [: ] N [: ] N HTA U type HTA type 2 Axial loadkn Pemissible axial loadkn Condition fo study HTA2UADBHTA2ADB Beaing HTA2UDBHTA2DB (22.2 ow) HTA U type HTA type 2. Fig.. Compaison of pemissible axial load Fig.. Axial load and igidity 22

247 NTN Main Spindle Beaings High speed test dmn value of. million unde gease lubication and.2 million unde ai-oil lubication ae ealized by the optimized intenal design. (Fig...) Test condition Beaing[: ] Speed Mounted peload Lubication Gease type Jacket coating HTA2UADB HTA2ADB (22.2 ows) min - N Gease MP- w/, w/o Test condition Beaing[: ] Speed Mounted peload Lubication Oil Ai Jacket cooling HTA2UADB HTA2ADB (22.2 ows) min - N Ai- oil. ml/shot Oil shot inteval min NL/min w/, w/o OR tempeatue ise 2 2 HTA2UA w/o jacket cooling HTA2UA w/ jacket cooling HTA2A w/o jacket cooling HTA2A w/ jacket cooling OR tempeatue ise 2 2 HTA2UA w/o jacket cooling HTA2UA w/ jacket cooling HTA2A w/o jacket cooling HTA2A w/ jacket cooling 2 Speedmin - 2 Speedmin dmn value Fig.. Compaison of tempeatue ise (Gease, ) dmn value Fig.. Compaison of tempeatue ise (Ai-oil, ) Test condition Beaing[: ] Speed Mounted peload Lubication Gease type Jacket coating HTA2UDB HTA2DB (22.2 ows) min - N Gease MP- w/, w/o Test condition Beaing[: ] Speed Mounted peload Lubication Oil Ai Jacket cooling HTA2UDB HTA2DB (22.2 ows) min - N Ai- oil. ml/shot Oil shot inteval min NL/min w/, w/o OR tempeatue ise 2 2 HTA2U w/o jacket cooling HTA2U w/ jacket cooling HTA2 w/o jacket cooling HTA2 w/ jacket cooling OR tempeatue ise 2 2 HTA2U w/o jacket cooling HTA2U w/ jacket cooling HTA2 w/o jacket cooling HTA2 w/ jacket cooling 2 Speedmin - 2 Speedmin dmn value Fig.. Compaison of tempeatue ise (Gease, ).2.. dmn value Fig.. Compaison of tempeatue ise (Ai-oil, ) 2

248 Main Spindle Beaings! Dimension tables fo angula contact ball beaings Double-diection angula contact thust ball beaings 29 seies Contact angle d 2mm T C J d EW D Pat numbe Bounday dimensions Basic load atings Limiting speed Mass dynamic static dynamic static (appox.) d mm kn kgf min - kg small lage small lage gease oil small lage size size size size D T C s min s min Ca Coa Ca Coa lubication lubication size size M M M M M M M M M M M M M M M M M M Minimum allowable value fo cone adius dimension o. 2 Maximum cicumscibed cicle diamete of balls. 2

249 Main Spindle Beaings a a Wo -do Db da Dynamic equivalent axial load Pa=Fa Static equivalent axial load Poa=Fa Refeence Abutment and Pat numbe dimensions fillet dimensions mm mm da Db as as small lage J Ew 2 min max max max size size M M M M M M M M M M M M M M M M M M Dimensions of oil hole and oil goove Nominal oute diamete D ove incl. Oil Oil goove hole width Wo unit: mm do

250 Main Spindle Beaings Double-diection angula contact thust ball beaings 2 seies Contact angle d 22mm T C J d EW D 2 Pat numbe Bounday dimensions Basic load atings Limiting speed Mass dynamic static dynamic static (appox.) d mm kn kgf min - kg small lage small lage gease oil small lage size size size size D T C s min s min Ca Coa Ca Coa lubication lubication size size 2 2M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M Minimum allowable value fo cone adius dimension o. 2 Maximum cicumscibed cicle diamete of balls.

251 Main Spindle Beaings a a Wo -do Db da Dynamic equivalent axial load Pa=Fa Static equivalent axial load Poa=Fa Refeence Abutment and Pat numbe dimensions fillet dimensions mm mm da Db as as small lage J Ew 2 min max max max size size M M M M M M.. 2 2M M M M M M M M M M M M M M M M M M M M M M M M. 2 2M. 2 2M M Dimensions of oil hole and oil goove unit: mm Nominal oute diamete D ove incl. Oil Oil goove hole width Wo do

252 Main Spindle Beaings Angula contact ball beaings fo axial loads (steel ball type) HTA9UA seies Contact angle d 2mm 2B D d dd2 2a Pat Bounday dimensions Basic load atings Static thust Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min - gease oil d D 2B s min s min Ca Coa Ca Coa lubication lubication HTA92UADB HTA92UADB.... HTA922UADB HTA92UADB HTA92UADB.. HTA92UADB 9.. HTA9UADB HTA92UADB HTA9UADB HTA9UADB HTA9UADB HTA9UADB HTA9UADB HTA9UADB HTA92UADB HTA9UADB HTA9UADB HTA9UADB Minimum allowable value fo cone adius dimension o. 2

253 Main Spindle Beaings as as da Db Dynamic equivalent axial load Pa=Fa Static equivalent axial load Poa=Fa Load Intenal Mass Refeence Abutment and fillet dimensions Pat cente fee space dimensions numbe mm cm kg mm Two ow Two ow da Db as as 2a (appox.) (appox.) d D2 min max max max HTA92UADB HTA92UADB HTA922UADB HTA92UADB HTA92UADB HTA92UADB HTA9UADB HTA92UADB HTA9UADB HTA9UADB HTA9UADB HTA9UADB HTA9UADB HTA9UADB HTA92UADB HTA9UADB HTA9UADB HTA9UADB 29

254 Main Spindle Beaings Angula contact ball beaings fo axial loads (steel ball type) HTA9U seies Contact angle d 2mm 2B D d dd2 2a Pat Bounday dimensions Basic load atings Static thust Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min - gease oil d D 2B s min s min Ca Coa Ca Coa lubication lubication HTA92UDB HTA92UDB HTA922UDB HTA92UDB HTA92UDB HTA92UDB HTA9UDB HTA92UDB HTA9UDB HTA9UDB 2 2 HTA9UDB HTA9UDB HTA9UDB HTA9UDB HTA92UDB HTA9UDB HTA9UDB HTA9UDB Minimum allowable value fo cone adius dimension o. 2

255 Main Spindle Beaings as as da Db Dynamic equivalent axial load Pa=Fa Static equivalent axial load Poa=Fa Load Intenal Mass Refeence Abutment and fillet dimensions Pat cente fee space dimensions numbe mm cm kg mm Two ow Two ow da Db as as 2a (appox.) (appox.) d D2 min max max max HTA92UDB HTA92UDB HTA922UDB HTA92UDB HTA92UDB HTA92UDB HTA9UDB HTA92UDB HTA9UDB HTA9UDB HTA9UDB HTA9UDB HTA9UDB HTA9UDB HTA92UDB HTA9UDB HTA9UDB HTA9UDB 2

256 Main Spindle Beaings Angula contact ball beaings fo axial loads (steel ball type) HTAUA seies Contact angle d 2mm 2B D d dd2 2a Pat Bounday dimensions Basic load atings Static thust Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min - gease oil d D 2B s min s min Ca Coa Ca Coa lubication lubication HTAUADB HTAUADB HTA2UADB HTAUADB HTAUADB HTAUADB HTAUADB HTAUADB HTAUADB HTA9UADB 9... HTA2UADB HTA2UADB HTA22UADB HTA2UADB HTA2UADB HTA2UADB HTAUADB HTA2UADB HTAUADB HTAUADB HTAUADB HTAUADB HTAUADB HTAUADB HTA2UADB HTAUADB HTAUADB HTAUADB Minimum allowable value fo cone adius dimension o. 22

257 Main Spindle Beaings as as da Db Dynamic equivalent axial load Pa=Fa Static equivalent axial load Poa=Fa Load Intenal Mass Refeence Abutment and fillet dimensions Pat cente fee space dimensions numbe mm cm kg mm Two ow Two ow da Db as as 2a d D2 min max max max HTAUADB HTAUADB HTA2UADB HTAUADB HTAUADB HTAUADB HTAUADB HTAUADB HTAUADB HTA9UADB HTA2UADB HTA2UADB HTA22UADB HTA2UADB HTA2UADB HTA2UADB HTAUADB HTA2UADB HTAUADB HTAUADB HTAUADB HTAUADB HTAUADB HTAUADB HTA2UADB HTAUADB HTAUADB HTAUADB 2

258 Main Spindle Beaings Angula contact ball beaings fo axial loads (steel ball type) HTAU seies Contact angle d 2mm 2B D d dd2 2a Pat Bounday dimensions Basic load atings Static thust Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min - gease oil d D 2B s min s min Ca Coa Ca Coa lubication lubication HTAUDB HTAUDB HTA2UDB HTAUDB HTAUDB HTAUDB HTAUDB HTAUDB HTAUDB HTA9UDB HTA2UDB HTA2UDB HTA22UDB HTA2UDB HTA2UDB HTA2UDB HTAUDB HTA2UDB HTAUDB HTAUDB HTAUDB HTAUDB HTAUDB HTAUDB HTA2UDB HTAUDB HTAUDB HTAUDB Minimum allowable value fo cone adius dimension o. 2

259 Main Spindle Beaings as as da Db Dynamic equivalent axial load Pa=Fa Static equivalent axial load Poa=Fa Load Intenal Mass Refeence Abutment and fillet dimensions Pat cente fee space dimensions numbe mm cm kg mm Two ow Two ow da Db as as 2a (appox.) (appox.) d D2 min max max max HTAUDB HTAUDB HTA2UDB HTAUDB HTAUDB HTAUDB HTAUDB HTAUDB HTAUDB HTA9UDB HTA2UDB HTA2UDB HTA22UDB HTA2UDB HTA2UDB HTA2UDB HTAUDB HTA2UDB HTAUDB HTAUDB HTAUDB HTAUDB HTAUDB HTAUDB HTA2UDB HTAUDB HTAUDB HTAUDB 2

260 Main Spindle Beaings Angula contact ball beaings fo axial loads (ceamic ball type) S-HTAUA seies Contact angle d mm 2B D d dd2 2a Pat Bounday dimensions Basic load atings Static thust Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min - gease oil d D 2B s min s min Ca Coa Ca Coa lubication lubication S-HTAUADB S-HTAUADB S-HTA2UADB S-HTAUADB S-HTAUADB S-HTAUADB S-HTAUADB S-HTAUADB S-HTAUADB S-HTA9UADB S-HTA2UADB S-HTA2UADB S-HTA22UADB S-HTA2UADB S-HTA2UADB Minimum allowable value fo cone adius dimension o. 2

261 Main Spindle Beaings as as da Db Dynamic equivalent axial load Pa=Fa Static equivalent axial load Poa=Fa Load Intenal Mass Refeence Abutment and fillet dimensions Pat cente fee space dimensions numbe mm cm kg mm Two ow Two ow da Db as as 2a (appox.) (appox.) d D2 min max max max S-HTAUADB S-HTAUADB S-HTA2UADB S-HTAUADB S-HTAUADB S-HTAUADB S-HTAUADB S-HTAUADB S-HTAUADB S-HTA9UADB S-HTA2UADB S-HTA2UADB S-HTA22UADB S-HTA2UADB S-HTA2UADB 2

262 Main Spindle Beaings Angula contact ball beaings fo axial loads (ceamic ball type) S-HTAU seies Contact angle d mm 2B D d dd2 2a Pat Bounday dimensions Basic load atings Static thust Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min - gease oil d D 2B s min s min Ca Coa Ca Coa lubication lubication S-HTAUDB S-HTAUDB S-HTA2UDB S-HTAUDB S-HTAUDB S-HTAUDB S-HTAUDB S-HTAUDB S-HTAUDB S-HTA9UDB S-HTA2UDB S-HTA2UDB S-HTA22UDB S-HTA2UDB S-HTA2UDB Minimum allowable value fo cone adius dimension o. 2

263 Main Spindle Beaings as as da Db Dynamic equivalent axial load Pa=Fa Static equivalent axial load Poa=Fa Load Intenal Mass Refeence Abutment and fillet dimensions Pat cente fee space dimensions numbe mm cm kg mm Two ow Two ow da Db as as 2a (appox.) (appox.) d D2 min max max max S-HTAUDB S-HTAUDB S-HTA2UDB S-HTAUDB S-HTAUDB S-HTAUDB S-HTAUDB S-HTAUDB S-HTAUDB S-HTA9UDB S-HTA2UDB S-HTA2UDB S-HTA22UDB S-HTA2UDB S-HTA2UDB 29

264 NTN Main Spindle Beaings

265 NTN Main Spindle Beaings Main Spindle Beaings 2. Tapeed Rolle Beaings CONTENTS 2. Tapeed Rolle Beaings 222 q Load calculation 22 w Beaing designation 22 e Accuacy2 Recommended fit fo high-pecision tapeed olle beaings 2 t Dimension tables 2 2

266 NTN Main Spindle Beaings 2. Tapeed Rolle Beaings 2 Beaing designations Tapeed olle beaings ae designed so that the apexes of the inne ing, oute ing, and olles ae located at a common point on the beaing cente line. Accodingly, the olles oll on the aceway sufaces and slide along the back ib of the inne ing cone, guided by the esultant foce fom the inne ing and oute ing aceways. This beaing is suitable fo handling a adial load, an axial load in one diection, and the esultant load. Also, it has a lage load capacity. In geneal, the cage of a tapeed olle beaing is a punched steel plate type. If P o highe is needed fo unning accuacy, NTN ecommends that a highstength machined bass cage to be used. Load calculation Tapeed olle beaings ae geneally used in pais, so thei dynamic equivalent load can be calculated accoding to Table XUDB+xxP Toleance class code P: JIS class P: JIS class UP: NTN special high pecision Space width dimension Duplex aangement code DB: Back-to-back DF: Face-to-face Intenal modification code Nominal boe diamete Beaing seies code Table 2. Beaing aangement and equivalent load Beaing aangement Load condition Axial load Equivalent adial load DB aangement F Fa 2 F2 F F2 Fa Y Y2 Fa F2 Fa Y2 F2 Fa2 Y2 PXFY P2F2 F2 Fa Y2 DF aangement 2 Fa F2 F F F2 Fa Y Y2 F Fa Y Fa2 F Fa Y PF P2XF2Y2 F Fa Y DB aangement 2 Fa F F2 F2 F Fa Y2 Y F Fa Y Fa2 F Fa Y PF P2XF2Y2 F Fa Y DF aangement 2 F2 Fa F F2 F Fa Y2 Y Fa F2 Fa Y2 F2 Fa2 Y2 PXFY P2F2 F2 F Y2 Note : The above ae valid when the beaing intenal cleaance and peload ae zeo. 2: Radial foces in the opposite diection to the aow in the above illustation ae also egaded as positive. 22

267 NTN Main Spindle Beaings Accuacy Table 2.2 Inne ings Nominal boe diamete d ove incl Deviation of mean boe diamete in a single plane Δdmp Vaiation of boe diamete in a single plane Vdsp Class Class Class Class Class Class Class Class Class Class Class Class Class Class Class high low high low max max max max max high low high low Mean boe diamete deviation Vdmp 9 Radial unout Kia Pependiculaity of inne ing face with espect to the boe Sd 9 Axial unout Sia Width vaiation ΔBs 2 2 The toleance of boe diamete deviation Δds applicable to class is the same as the toleance of single plane mean boe diamete deviation Δdmp. Unit: Deviation of the actual beaing width ΔTs Table 2. Oute ings Nominal boe diamete D ove incl. Deviation of mean outside diamete in a single plane ΔDmp Class Class 2 high low high low Vaiation of outside diamete in a single plane VDsp Class Class max Mean single plane outside diamete vaiation VDmp Class Class max Radial unout Kea Class Class max Pependiculaity of oute ing outside suface with espect to the face SD Class Class max Unit: Axial unout Sea Class max The toleance of outside diamete deviation ΔDs applicable to class is the same as the toleance of single plane mean outside diamete deviation ΔDmp. 9 Recommended fit fo high-pecision tapeed olle beaings Table 2. Fit to shaft Unit: Table 2. Fit to housing Unit: Nominal boe diamete d ove incl. Fit between inne ing and shaft Fixed side Tageted intefeence Floating side Tageted intefeence Nominal boe diamete D ove incl. Fit between oute ing and housing Tageted intefeence T T T T 2T T 2 T T T T T T T T T 2 2 T T T 2 Taget the median value. T: Tight (Intefeence) T T T T 2 T T T 2

268 Main Spindle Beaings Dimension tables fo tapeed olle beaings Tapeed Rolle Beaings d 29mm C T 2 D 2 B d a pat Bounday dimensions Basic load atings Limiting speed numbe dynamic static dynamic static mm kn kgf min - gease oil d D T B C s min s min 2s min C Co C Co lubication lubication T-2X T-2X T-2X T-2X T-2X T-29X XU T-2X XU... T-2X XA... 2 T-22X XU T-2X XU T-2X XU XU XU XU XU XU XU XU XU XU Minimum allowable value fo chamfe dimension, o 2. 2

269 Main Spindle Beaings Sa Sb a Dynamic equivalent adial load a PXFYFa Da db da Db Fa Fa e F F e X Y X Y. Y2 Static equivalent adial load Po.FYoFa Note that when PoF, PoF. The values fo e, Y2 and Yo ae given in the table below. Abutment and fillet dimensions Load Facto Axial Mass cente load facto mm mm kg da db Da Db Sa Sb as as min max max min min min min max max a e Y2 Y (appox.)

270 Main Spindle Beaings Tapeed Rolle Beaings d 9mm C T 2 D 2 B d a pat Bounday dimensions Basic load atings Limiting speed numbe dynamic static dynamic static mm kn kgf min - gease oil d D T B C s min s min 2s min C Co C Co lubication lubication 292XU XU XA XU XA XU XU XU XU XU XU XU XU XU XU XU XU XU XU XU Minimum allowable value fo chamfe dimension, o 2. 2

271 Main Spindle Beaings Sa Sb a Dynamic equivalent adial load a PXFYFa Da db da Db Fa Fa e F F e X Y X Y. Y2 Static equivalent adial load Po.FYoFa Note that when PoF, PoF. The values fo e, Y2 and Yo ae given in the table below. Abutment and fillet dimensions Load Facto Axial Mass cente load facto mm mm kg da db Da Db Sa Sb as as min max max min min min min max max a e Y2 Y (appox.)

272 NTN Ball Scew Suppot Beaings

273 NTN Ball Scew Suppot Beaings Ball Scew Suppot Beaings. Ball Scew Suppot Beaings CONTENTS. Ball Scew Suppot Beaings 229 q Angula contact thust ball beaings 2A-BST seies 2 w Duplex angula contact ball beaings HT seies 2 e Needle olle beaings with double-ow thust needle olle beaings AXN seies 2 Needle olle beaings with double-ow thust cylindical olle beaings ARN seies 2 Beaing designations 2 t Beaing pecision 2 y Basic peload and axial igidity u Shaft and housing fit 2 29 i Applications29 o Stating toque of BST type 2! Recommended lubication specifications 2! Dimension tables Angula contact thust ball beaings BST and BST LXL seies 22 2A-BST and 2A-BST LXL seies 2 Duplex angula contact ball beaings HT seies 2 Needle olle beaings with double-ow thust needle olle beaings AXN, ARN seies 29 29

274 NTN Ball Scew Suppot Beaings. Ball Scew Suppot Beaings NTN ballscew beaings ae optimized to suppot a ballscew. These beaings ae categoized as shown in Table.. Table. Beaing types Type code Notes Boe diamete BST 2A-BST BST LXL/L 2A-BST LXL/L HT AXN ARN Open type thust angula contact ball beaing with contact angle, geneally used with gease lubication Gease-lubicated sealed angula contact ball beaing with contact angle Duplex angula contact ball beaing with contact angle, geneally used with gease lubication Needle olle beaing with double-diection thust needle olle beaing, geneally used with oil lubication Needle olle beaing with double-diection thust cylindical olle beaing, geneally used with oil lubication 2 2 Angula contact thust ball beaings BST-B (LXL/L), 2A-BST-B (LXL/L) seies The 2A-BST type incopoates the maximum possible numbe of small balls (compaed with those of a standad beaing), has thicke inne and oute ings, and a lage contact angle of. Thus, this type of beaing boasts geate axial igidity. Additionally, since balls ae used as the olling elements, the stating toque of a angula contact thust ball beaing is less than that of a olle beaing. Open (BST and 2A-BST type) and light-contact seals (BST LXL and 2A-BST LXL type) ae available and molded esin cages ae standad. Side faces of BST type beaings ae flush-gound to povide the same face height diffeence fo both the font and back faces. As a esult, beaings of the same pat numbe can be feely combined into DB, DBT, DTBT configuations as illustated in Fig..2, and the adjustment fo a elevant peload is no longe necessay. Evey single beaing is machined to the same face height so that when any aangement is installed on a ballscew the unit has optimal peload. Fo this eason, no time-consuming peload adjustment (adjustment with shims o tightening and loosening while measuing the stating toque) is necessay. Featues 2A-BST-B (LXL/L). Unique heat teatment geatly impoves esistance against olling contact fatigue, leading to longe sevice life (appoximately two times that of the conventional type). 2. Both sides ae sealed to enhance contamination esistance and to peseve the gease. (Lightcontact seal type). Special long-life gease is used. (Light-contact seal type). The combination of a unique heat teatment and special gease educes fetting (by % o moe fo sliding mode, 9% o moe fo olling mode, compaed to the conventional type). (Light-contact seal type). Pe-gease beaings eliminate the need fo futhe gease packing and allow easie handling. (Lightcontact seal type) Open type 2A-BST type Light-contact sealed type 2A-BST LXL type Fig.. DB DBT DTBT Fig..2 Beaing aangement 2

275 NTN Ball Scew Suppot Beaings Easy handling 2A-BST LXL type and BST LXL gease-lubicated sealed angula contact ball beaings eliminate the need fo gease filling because they have been packed with gease in advance. You need to only wipe away ust peventive oil befoe use. Seals in diffeent colos ae used fo the font and back sides. The font side (black) and back side (oange) can be identified by the colo of a seal, and you can easily check configuation duing assembly. Load Sliding Ball Plate DB set (back faces in combination) Oange seal Oange seal DF set (font faces in combination) Fig.. Fetting esistance test (sliding) Table. Test conditions Plate Mateial Ball Load (N) Max. contact suface pessue (MPa) Loading fequency ( cycle) Sliding cycle (Hz) Amplitude (mm) Lubication Tempeatue Conventional type (SUJ2 without special heat teatment) ULTAGE seies (SUJ2 with special heat teatment) SUJ2 9 2 Test time: h. Gease Room tempeatue Black seal Black seal Won depth of plate Wea atio Conventional type ULTAGE seies Conventional type. ULTAGE seies.2 Amount of wea / Pefomance tests 2A-BST-B (LXL/L) Ball scew suppot thust angula contact ball beaings have a unique intenal design in ode to lengthen sevice life and enhance esistance to fetting. () Fetting esistance test (sliding) Resistance to fetting while sliding is tested by the fetting esistance test. A conceptual dawing of the test is shown in Fig.., and the test conditions ae shown in Table.. In this test, a fixed ball is pushed against a plate, and ecipocated fo a fixed peiod. The volume of ball and plate wea depth ae checked afte testing as shown in Fig... Due to a unique heat teatment and special gease (light-contact seal type), amount of wea is educed to / o less compaed to the conventional type consisting of standad SUJ2 plate mateial and lithiumbased geneal pupose gease. (Fig..) Wea of ball Wea atio Conventional type ULTAGE seies Conventional type. ULTAGE seies.2 Amount of wea / Fig.. Ratio of fetting coosion in sliding mode 2

276 NTN Ball Scew Suppot Beaings (2) Fetting esistance test (olling) Resistance against fetting while olling is tested in the otating and oscillating type fetting coosion test. A conceptual dawing of the test is shown in Fig.., and the test conditions ae shown in Table -. In this test, a housing plate is fixed, and the shaft plate oscillates. The decease in the weight of the beaing plate afte the test is shown in Fig... Due to the combination of a unique heat teatment and a special gease (light-contact seal type), the amount of wea is educed to / o less compaed to the conventional type consisting of standad SUJ2 steel ings and lithium based geneal pupose gease. (Fig..). () Rolling contact fatigue life test Resistance to olling contact fatigue is impoved as a esult of a special heat teatment, leading to a longe sevice life compaed to the standad heat-teated type model in both clean and contaminated oil. (Fig..) Table. Test conditions Beaing (mm) Radial load (kn) Shaft speed (min - ) Lubication Atmosphee tempeatue ( C) Evaluated with deep goove ball beaing VG tubine oil Load 2. 2 Standad heat-teated ULTAGE seies Clean oil Life atio. Standad heat-teated. ULTAGE seies times longe compaed to conventional Table. Test conditions Beaing (mm) Load (kn) Max. contact suface pessue (MPa) Test time (h) Oscillating cycle (Hz) Oscillating angle (deg) Lubication Tempeatue Oscillation Fig.. Fetting esistance test (olling) Evaluated with thust ball beaing Gease Room tempeatue Oil mixed with foeign mattes Life atio Standad heat-teated ULTAGE seies Standad heat-teated. ULTAGE seies times longe compaed to conventional Fig.. Effect of special heat teatment on olling contact fatigue life.2 Wea atio....2 Wea / Conventional type (beaing plate SUJ2, lithium base geneal pupose gease) 2 ULTAGE seies (beaing plate SUJ2 with special heat teatment, special gease) Conventional type (beaing plate SUJ2, lithium base geneal pupose gease). 2 ULTAGE seies (beaing plate SUJ2 with special heat teatment, special gease). Fig.. Ratio of fetting coosion while olling 22

277 NTN Ball Scew Suppot Beaings () Gease life test Sevice life of the gease has been damatically extended compaed to lithium-base geneal pupose gease (Fig..). (Special gease is available fo only the light-contact seal type.) Table. Test conditions Beaing (mm) Radial load (N) Axial load (N) Shaft speed (min - ) Atmosphee tempeatue ( C) Evaluated with deep goove ball beaing Duplex angula contact ball beaings HT seies HT type duplex angula contact ball beaings featue lage axial load capacity while maintaining the same dimensions as a standad angula contact ball beaing (contact angle: ). Beaings smalle than the BST type ae available fo use in small poducts. Life atio Lithium base geneal pupose gease ULTAGE seies (Special gease) Lithium base geneal pupose gease. ULTAGE seies.9 (Special gease) times longe compaed to conventional type Fig.. HT Needle olle beaings with double-ow thust needle olle beaings AXN seies Needle olle beaings with double-ow thust cylindical olle beaings ARN seies Fig.. Gease life atio () Gease leakage test Light-contact type seals eliminate gease leakage fom the beaing. (Fig..9) Table. Test conditions Beaing 2A-BST2-BDFP (mm) 22 ows Axial load (kn).9 Shaft speed (min - ) 2 unning fo two hous fo each step Atmosphee Room tempeatue AXN and ARN type beaings have thust needle olle o thust cylindical olle beaings on both sides of a adial needle olle beaing. The oute ing side face of the adial needle olle beaing is used as the aceway of both thust beaings. These beaings can withstand axial loads in both diections while maintaining compact designs. The adial needle olle beaings ae suitable fo heavy adial loads. The axial igidity of the AXN type is extemely enhanced since the thust needle olle beaings ae used fo axial loads. Likewise, the axial igidity of the ARN type is impoved. Since the axial load capacity of this type is lage than the AXN type, this type is suitable fo heavy axial loads. Oil lubication is ecommended fo the ARN type. Leaked gease quantity Lithium base geneal pupose gease ULTAGE seies (Special gease) Lithium base geneal pupose gease.g ULTAGE seies.g (Special gease) Fig.. AXN Fig..9 Gease leakage Fig..2 ARN 2

278 NTN Ball Scew Suppot Beaings Beaing designations The pat numbe fo a ballscew beaing consists of a type code, dimension code, and vaious suffixes. 2A-BST type 2A - BST 2 B LXL DBT P / L Gease code L: Uea based special gease Toleance class code P: JIS Class (equivalent) P: JIS Class (equivalent) UP: NTN Class Aangement code Seal code LXL:Light contact ubbe seals Identification code Peload code and added numbe -B: Standad peload -B: Light peload Outside diamete (mm) Nominal boe diamete (mm) Beaing type code Heat teatment HT type AXN and ARN type HTDF/GMP Toleance class code P: JIS class P: JIS class Intenal cleaance code GM: Medium peload GH: Heavy peload Aangement code Intenal design code Nominal boe diamete (See dimension tables.) Dimension seies code Beaing type code AXN 22 P Toleance class code P: JIS Class P: JIS Class Dimension Boe diamete, outside diamete (mm) Beaing type code AXN ARN 2

279 NTN Ball Scew Suppot Beaings Beaing pecision The pecision of ballscew beaings vaies depending on the beaing type. 2A-BST type Available in NTN class (toleance class code P), class (toleance class code P) each complying with JIS standads, and gade UP (toleance class code UP). The classes ae listed in ascending ode. HT type Same pecision as the main spindle angula contact ball beaing. Classes and ae available. AXN, ARN types NTN standad classes and complying with the JIS standads. Accuacy of 2A-BST type Table. Inne ings Nominal boe diamete d ove incl. Single plane mean boe diamete deviation Δdmp Class Class Class UP Class Class Class UP Class Class Class UP Class Class Class UP Class Class Class UP Class Class Class UP high low high low high low max max max max high low high low high low 9.. Width vaiation VBs Radial unout Kia. 2 2 Face unout with boe Sd 2 Axial unout Sia Unit: Width deviation ΔBs The toleance of outside diamete deviation Δds applicable to classes and UP is the same as the toleance of single plane mean outside diamete deviation Δdmp. Table.9 Oute ings Nominal boe diamete d Single plane mean outside diamete deviation ΔDmp Width vaiation VCs Class Class Class UP Class Class Class UP ove incl. high low high low high low max Radial unout Kea Class Class Class UP max Outside suface inclination SD Class Class Class UP max Axial unout Sea All classes Unit: Width deviation ΔCs All classes Identical to Si elative to d on the same beaing. Identical to ΔBS elative to d on the same beaing. 2 The toleance of outside diamete deviation ΔDs applicable to classes and UP is the same as the toleance of single plane mean outside diamete deviation ΔDmp. 2

280 NTN Ball Scew Suppot Beaings Accuacy of HT type Table. Inne ings Nominal boe diamete d Single plane mean boe diamete deviation Δdmp Class Class Class 2 ove incl. high low high low high low Single adial plane boe diamete vaiation Vdp Diamete seies 9 Diamete seies,2 Class Class Class 2 Class Class Class 2 max max Mean boe diamete deviation Vdmp Class Class Class 2 max The toleance of boe diamete deviation Δds, applicable to classes and 2, is the same as the toleance of mean boe diamete deviation Δdmp. This applies to the diamete seies o 2 fo class, and all the diamete seies fo class 2. 2 Applicable to individual beaing ings manufactued fo duplex beaings Inne ing adial unout Kia Class Class Class 2 max Table. Oute ings Nominal outside diamete D Single plane mean outside diamete deviation ΔDmp Class Class Class 2 ove incl. high low high low high low Single adial plane outside diamete deviation VDp Diamete seies 9 Diamete seies,2 Class Class Class 2 max Class Class Class 2 max Mean single plane outside diamete deviation VDmp Class Class Class 2 max Oute ing adial unout Kea Class Class Class 2 max The toleance of outside diamete deviation ΔDs, applicable to classes and 2, is the same as the toleance of mean outside diamete deviation ΔDmp. This applies to the diamete seies o 2 fo class, and all the diamete seies fo class 2. 2

281 NTN Ball Scew Suppot Beaings Face unout with boe Sd Class Class Class 2 max Axial unout Width vaiation Sia ΔBs Single beaing Class Class Class 2 Class Class Class 2 max high low high low Duplex beaing 2 Class Class high low Width vaiation VBs Unit: Class Class Class 2 max Unit: Outside suface inclination SD Axial unout Sea Width vaiation ΔCs Width vaiation VCs Class Class Class 2 max Class Class Class 2 max All classes Class Class Class 2 max Identical to ΔBs elative to d of the same beaing

282 NTN Ball Scew Suppot Beaings Accuacy of AXN and ARN type Table.2 Inne ing and oute ing Nominal beaing boe dia. d o nominal beaing outside dia. D Deviation of mean boe diamete in a single plane Δdmp Thust inne ing boe dia. deviation Δdis Class Class Ove Incl. High Low High Low High Low Class Class High Low High Low 9 Applicable only to dimension d. 2Applicable only to dimension D. Deviation of mean outside 2 diamete in a single plane ΔDmp 9 Beaing height deviation ΔTs High Low Oute ing width deviation High ΔCs Low Radial inne ing adial unout Kia Class Class Max. Unit: Oute 2 Pependiculaity 2 Thust inne ing ing of oute ing and adial unout outside suface with oute ing 2 espect to the face thickness Kea SD vaiation Sia, Sea Class Class Class Class Class Class Max. Max. Max Basic peload and axial igidity Basic peloads fo each type of ball scew suppot beaings ae shown in the dimension tables. The peloads can be alteed depending on the equied igidity. Contact NTN in such a case. In the AXN and ARN types, igidity is nomally enhanced by tightening the thust beaing ings to supply peload. Peloads and toques ae shown in the dimensions tables to help contol basic peload. A beaing that allows peset peload by tightening the beaing aceways to adjust the cleaance A between the both thust beaing ings and adial beaing ings (Fig..) is also available. Ask NTN fo details. Axial igidity of the 2A-BST type DB duplex aangement and the AXN type at the basic peload ae shown in Figs.. and.. (Notes) Axial displacement is measued unde standad peloaded. Axial displacementm 2 2 2A-BST-B,2A-BST2-B Axial loadkn 2A-BST2-B,2A-BST2-B 2A-BST22-B,2A-BST2-B 2A-BST9-B 2A-BST2-B,2A-BST2-B 2 KN=2kgf 2A-BST-B, 2A-BST-B, 2A-BST-B Fig.. BST type igidity chat Fig.. AXN type axial displacementm AXN22 AXN AXN2 AXN AXN2 AXN AXN9 2 Axial loadkn KN=2kgf Fig.. AXN type igidity chat 2

283 NTN Ball Scew Suppot Beaings Shaft and housing fits Recommended fit and toleances of shaft and housing shoulde squaeness ae shown in Figs.. and.. Table. Shaft and housing fits Table. Toleance of shoulde squaeness Unit: Type code Shaft outside diamete Fit Housing Diamete classification mm ove incl. BST HT Type code AXNARN BST HT AXN ARN h j H J 2 2 Applications The BST type is mainly installed on ball scews of machine tool feed systems, and two to fou ow aangements ae used in many cases. This type is popula because geased sealed angula contact ball beaings ae easy to handle. The back-to-back duplex aangement is commonly used because it allows acquisition of the specified peload by tightening the inne ing. The face-to-face duplex aangement may be used if moe pecise alignment is equied. It is not commonly used fo machine tools. Examples of beaing aangement ae shown in Figs.. and.. Fig.. Fig.. 29

284 NTN Ball Scew Suppot Beaings 9 Stating toque of 2A-BST type Refeence stating toque values fo 2A-BST beaings ae shown in Tables. and.. Table. Open type BST and 2A-BST BSTX-B 2A-BSTX-B BST2X-B 2A-BST2X-B BST2X2-B 2A-BST2X2-B BSTX2-B 2A-BSTX2-B BSTX2-B 2A-BSTX2-B BSTX2-B 2A-BSTX2-B BSTX9-B 2A-BSTX9-B BSTX-B 2A-BSTX-B BSTX-B 2A-BSTX-B BSTX-B 2A-BSTX-B BSTX-B 2A-BSTX-B DF type DB type Stating toque (efeence) Nmmkgfcm DFT type DBT type DTFT type DTBT type DFTT type DBTT type Table. Light-contact sealed type BST LXL/L and 2A-BST LXL/L BSTX-BLXL 2A-BSTX-BLXL BST2X-BLXL 2A-BST2X-BLXL BST2X2-BLXL 2A-BST2X2-BLXL BSTX2-BLXL 2A-BSTX2-BLXL BSTX2-BLXL 2A-BSTX2-BLXL BSTX2-BLXL 2A-BSTX2-BLXL BSTX9-BLXL 2A-BSTX9-BLXL BSTX-BLXL 2A-BSTX-BLXL BSTX-BLXL 2A-BSTX-BLXL BSTX-BLXL 2A-BSTX-BLXL BSTX-BLXL 2A-BSTX-BLXL DF type DB type Stating toque (efeence) Nmmkgfcm DFT type DTFT type DBT type DTBT type DFTT type DBTT type

285 NTN Ball Scew Suppot Beaings! Recommended lubication specifications BST and HT ball scew suppot angula contact ball beaings ae geneally lubicated with gease. (BST LXL beaings with light-contact seals ae packed with gease.) AXN and ARN beaings ae geneally lubicated with ciculated oil. Gease lubication Recommended type of gease Lithium-mineal oil base geneal pupose gease of which base oil viscosity is high (fo example, Alvania Gease S2, Shell). Oil lubication Recommended type of oil Hydaulic oils o othe industial oils used fo lubication of sliding sufaces with viscosity gade ISO VG o highe ae ecommended. Oil quantity Recommended oil quantity depends on the lubicating method. As a geneal guideline, the oil flow ate should be to cm /min. Recommended gease fill 2% of the capacity shown in the dimensions tables Recommended gease filling method Refe to ". Handling of Beaings, q Rinsing of beaings and gease filling" in the Technical Data section. 2

286 Ball Scew Suppot Beaings!Dimension tables Angula contact thust ball beaings fo ball scews BST seies Contact angle d mm Dynamic equivalent axial load PaXFYFa Numbe of ows in beaing aangement 2 Numbe of ows subjected to axial load Fa / F2. X Y Fa / F2. X Y D Dd2 B d dd2 Static equivalent axial load PoaFa.9F Open type Contact sealed type Pat numbe Bounday dimensions Ca Basic dynamic ated load Ca Coa Basic static ated load Coa mm kn kn kgf kgf d D B s min d s min D B s min s min 2 2 BSTX-B BSTX-BLXL 2 BST2X-B BST2X-BLXL 2 BST2X2-B BST2X2-BLXL BSTX2-B BSTX2-BLXL BSTX2-B BSTX2-BLXL 2 BSTX2-B BSTX2-BLXL 2 BSTX9-B BSTX9-BLXL BSTX-B BSTX-BLXL 9 2 BSTX-B BSTX-BLXL BSTX-B BSTX-BLXL BSTX-B BSTX-BLXL BSTX2-B BSTX2-BLXL BSTX2-B BSTX2-BLXL Minimum allowable value fo chamfe dimension o. 22

287 Ball Scew Suppot Beaings When one ow beas axial load DF) When two ows bea axial load DFT) When two ows bea axial load DTFT) When thee ows bea axial load DFTT) Dimensions Space Static axial load capacity capacity mm cm knt Single-ow kgf d d2 D D2 (appox.)

288 Ball Scew Suppot Beaings Angula contact thust ball beaings fo ball scews 2A-BST seies Contact angle d mm Dynamic equivalent axial load PaXFYFa Numbe of ows in beaing aangement 2 Numbe of ows subjected to axial load Fa / F2. X Y Fa / F2. X Y D Dd2 B d dd2 Static equivalent axial load PoaFa.9F Open type Contact sealed type Pat numbe Bounday dimensions Ca Basic dynamic ated load Ca Coa Basic static ated load Coa mm kn kn kgf kgf d D B s min d s min D B s min s min 2 2 2A-BSTX-B A-BSTX-BLXL 2 2A-BST2X-B A-BST2X-BLXL 2 2A-BST2X2-B A-BST2X2-BLXL A-BSTX2-B A-BSTX2-BLXL A-BSTX2-B A-BSTX2-BLXL 2 2A-BSTX2-B A-BSTX2-BLXL 2 2A-BSTX9-B A-BSTX9-BLXL A-BSTX-B A-BSTX-BLXL 9 2 2A-BSTX-B A-BSTX-BLXL 2A-BSTX-B A-BSTX-BLXL 2A-BSTX-B A-BSTX-BLXL 2A-BSTX2-B A-BSTX2-BLXL 2A-BSTX2-B A-BSTX2-BLXL Minimum allowable value fo chamfe dimension o. 2

289 Ball Scew Suppot Beaings When one ow beas axial load DF) When two ows bea axial load DFT) When two ows bea axial load DTFT) When thee ows bea axial load DFTT) Dimensions Space Static axial load capacity capacity mm cm kn Single-ow kg d d2 D D2 (appox.)

290 Ball Scew Suppot Beaings!22Peload and axial sping constant Angula contact thust ball beaings fo ball scews BST Type, 2A-BST Type Contact angle d mm Pat numbe BSTX 2A-BSTX BST2X 2A-BST2X BST2X2 2A-BST2X2 BSTX2 2A-BSTX2 BSTX2 2A-BSTX2 BSTX2 2A-BSTX2 BSTX9 2A-BSTX9 BSTX 2A-BSTX BSTX 2A-BSTX BSTX 2A-BSTX BSTX 2A-BSTX BSTX2 2A-BSTX2 BSTX2 2A-BSTX2 Basic peload-b Double-ow (DF/DB types) Tiple-ow (DFT/DBT types) Fou-ow (DTFT/DTBT types) Peload Axial sping constant Peload Axial sping constant Peload Axial sping constant N kgf N/m kgf/m N kgf N/m kgf/m N kgf N/m kgf/m NOTE) Peload values ae those obtained fom matched beaings. Sping constants mean axial sping constants on beaings subjected to the peloads listed in the table. 2

291 Ball Scew Suppot Beaings Pat numbe BSTX 2A-BSTX BST2X 2A-BST2X BST2X2 2A-BST2X2 BSTX2 2A-BSTX2 BSTX2 2A-BSTX2 BSTX2 2A-BSTX2 BSTX9 2A-BSTX9 BSTX 2A-BSTX BSTX 2A-BSTX BSTX 2A-BSTX BSTX 2A-BSTX BSTX2 2A-BSTX2 BSTX2 2A-BSTX2 Light peload-b Double-ow (DF/DB types) Tiple-ow (DFT/DBT types) Fou-ow (DTFT/DTBT types) Peload Axial sping constant Peload Axial sping constant Peload Axial sping constant N kgf N/m kgf/m N kgf N/m kgf/m N kgf N/m kgf/m

292 Ball Scew Suppot Beaings Duplex angula contact ball beaings (HT seies) Contact angle d mm B B Dynamic equivalent axial load PaXFYFa Numbe of ows in beaing aangement Numbe of ows subjected to axial load X Fa / F. Y X Fa / F. Y D2 d d D Back-to-back (DB) Example diagam Pat numbe Bounday dimensions Basic load atings Dimensions Diagam dynamic static dynamic static mm kn kgf mm Back-to-back Face-to-face (DB) (DF) d D 2B s min s min Ca Coa Ca Coa d d2 D D2 9MADB 9MADF MDB MDF MADB 9MADF MDB MDF HTDB HTDF HTDB HTDF HTDB 2HTDF HTDB 2HTDF HTDB HTDF HTDB 2HTDF HTDB 2HTDF HTDB 2HTDF HTDB 2HTDF Minimum allowable value fo chamfe dimension o. 2 The numbe of ows means the numbe of beaings that bea the axial load. Peload values ae those obtained fom matched beaings. Sping constants mean axial sping constants on beaings subjected to the peloads listed in the table. 2

293 Ball Scew Suppot Beaings B B 2B 2B D d2 d D D2 d d D D d d D Face-to-face (DF) Example diagam Back-to-back (DB) Example diagam 2 Face-to-face (DF) Static axial load 2 Medium peload (GM) Heavy peload (GH) Stating Stating capacity Peload Axial sping constant toque Peload Axial sping constant toque kn kgf N kgf N/m kgf/m Nmm (appox.) N kgf N/m kgf/m Nmm (appox.) DB DBT DB DBT DB DBT DB DBT DB DBT DB DBT Single ow Double ow DF DFT DF DFT DF DFT DF DFT DF DFT DF DFT

294 Ball Scew Suppot Beaings Needle olle beaings with double-diection thust needle olle beaings (AXN seies) d 2mm T C DW D d dw F D Pat Bounday dimensions Basic load atings numbe dynamic static dynamic static dynamic static mm adial adial axial d dw D D T C F Dw s min s min kn kgf kn C Co C Co Ca Coa. AXN AXN AXN AXN AXN AXN AXN Minimum allowable value fo cone adius dimension o. 2 Stating toque value elative to the standad peload. 29

295 Ball Scew Suppot Beaings a a Da da Basic load atings Limiting Radial Abutment and Peload Stating 2 Mass Pat dynamic static speeds cleaance fillet dimensions toque numbe axial min - m mm N Nmm kg kgf gease oil da Da as as Ca Coa lubication lubication min max min max max max (appox.) (appox.) AXN AXN AXN AXN AXN AXN AXN9 29

296 Ball Scew Suppot Beaings Needle olle beaings with double-diection thust cylindical olle beaings (ARN seies) d 2mm T C DW D d dw F D Pat Bounday dimensions Basic load atings numbe dynamic static dynamic static dynamic static mm adial adial axial d dw D D T C F Dw s min s min kn kgf kn Minimum allowable value fo cone adius dimension o. 2 Stating toque value elative to the standad peload. C Co C Co Ca Coa ARN22T ARN ARN2T ARN ARN2T ARN ARNT ARN ARNT ARN ARNT ARN ARN ARN ARN ARN ARN ARN

297 Ball Scew Suppot Beaings a a Da da Basic load atings Limiting Radial Abutment and Peload Stating 2 Mass Pat dynamic static speeds cleaance fillet dimensions toque numbe axial min - m mm N Nmm kg kgf gease oil da Da as as Ca Coa lubication lubication min max min max max max (appox.) (appox.) ARN22T ARN ARN2T ARN ARN2T ARN ARNT ARN ARNT ARN9 9.. ARNT ARN ARN ARN ARN ARN ARN ARN 29

298 NTN Poducts. NTN Poducts -. Cam followes fo pallet change Cam followes ae often used on wok piece tansfe systems (such as pallet changes) of machine tools (such as machining centes) to handle the lage loads geneated by these systems. NTN offes vaious types of cam followes that include a eady-to-install cam followe optimized fo pallet changes. 2 Cam followe numbeing The pat numbe fo cam followes fo pallet changes is same as that of NTN special cam followes. KRX 2 - Stuctue and featues The oute ing wall thickness is maximized fo esistance to heavy load o impact load. NTN cam followes fo pallet changes featue a compact design and can be easily mounted by tightening a setscew. The oute diamete, oute ing width, and stud diamete ae identical to the dimensions of NTN's standad cam followes (KR type). Because cam followes fo pallet changes ae actuated less fequently, they do not need to be elubicated. The oil hole has been deleted. Cost is educed by emoving the gease hole and the thead fom the stud. Accuacy The accuacy of NTN cam followes fo pallet change is same as that of NTN standad cam followes (JIS class ). Fit Suffix Oveall length Oute dia. Stud dia. Type code Wall thickness of oute ing maximized Oil hole emoved fom stud The NTN pallet change cam followe has a special stud that is eadily secued with a setscew. As illustated below, a setscew locks the pallet change cam followe in the axial and cicumfeential diections. Setscew Oute diamete, oute ing width, and stud diamete ae identical to those of standad cam followe Thead emoved fom stud (to be secued with setscew) Fig. -2 Typical mounting aangement Fig. - Schematic of NTN pallet change cam followe 29

299 NTN Poducts Radial intenal cleaance The adial cleaance of NTN cam followes fo pallet changes is same as that of NTN standad cam followes (Table -). Table -. Inne ing Nominal inscibed cicle diamete Fw Cleaance CN (nomal cleaance) ove incl. min max 2 2 Lubication NTN cam followes fo pallet changes ae pefilled with lithium based gease and can be used in a tempeatue ange of -2 to + C. Unde the assumption that the use does not pefom elubication with gease, the standad NTN pallet change cam followe does not have an oil hole fo elubication. (If necessay, the cam followe can be povided with an oil hole o a hole fo mounting a gease nipple.) Upon equest, NTN can also povide cam followes with a synthetic ubbe seal. Lubication between the outside suface of beaing and tack is also necessay. Failue to popely lubicate the outside suface of the cam followe could lead to pematue wea of the beaing. (Example application of NTN cam followes fo pallet change) Photo: coutesy of Tsudakoma Cop. 29

300 NTN Poducts Cam followes fo pallet changes dimension table Sealed KRX type d 2mm Spheical oute ing type Cylindical oute ing type C C e L L2 L2 Detail of aea A Aea A D F d D B B2 B Cam followe numbe Spheical oute ing Cylindical oute ing Toleance Toleance (cylindical oute ing) Dimensions d D B B KRX2-/AS KRX2-2/AS KRX92-9/AS KRX92-/AS KRX22-/AS KRX22-/AS KRX2-/AS KRX2-2/AS KRX2-/AS KRX2/AS KRX22-/AS KRX22-/AS KRX.-/AS KRX.-/AS KRX.-/AS KRX.-/AS KRX2.-/AS KRX2.-/AS KRX22.-/AS KRX22.-/AS The cam followes in the table above have seals. Howeve, upon equest, NTN will offe a cam followes without seals. F B2 C C L L2 e 29

301 NTN Poducts (Refeence) Standad cam followe KRH type (w/ hex socket) C C d D h n G G B B B2 The dimensions of standad cam followes (maked with in the diagam above) ae diffeent fom those of NTN pallet change cam followes. Please see the efeence dimensions in the table below. Basic load atings dynamic static N kgf C Co Tack load capacity spheical oute ing N kgf cylindical oute ing (Refeence dimensions) mm B' B2 G G n h 2 M 2 2 M.2 2 M M M2. 2 M M.. M. 9. M2. 2. M

302 NTN Poducts 2. NTN Rolle Followe This type of beaing is used in mechanisms whee the oute ing olls on a tack, such as aligning olles, guide olles, ocke am olles, cam olles, and pessue olles. Fo inceased duability, it featues a thick-walled oute ing capable of withstanding geate loads and impacts. The oute suface of the oute ing (olling suface) can be odeed in eithe spheical and cylindical configuations.. Magnetic beaing spindle The NTN magnetic beaing spindle is compised of two adial magnetic beaings and one thust magnetic beaing, which suppot the spindle by magnetic foce. All beaings in the five-axis contol type spindle have a position senso to assist the contolle in poviding the coect amount of foce to keep the spindle in a fixed position. 29

303 NTN Poducts. High pecision ai spindle This ai spindle can be suppoted without diect contact by feeding clean compessed ai between a oto and a stato to fom thin ai film. NTNs supe pecision machining technique enables pecision of otation up to the submicon level. It also featues less fiction and longe sevice life.. NTN BEAREE FL & FL BEAREE FL & FL ae unique sliding mateials designed fo machine tools. Oil lubication achieves the smallest fiction coefficient possible. These mateials have the following featues: Minimized fiction coefficient (with oil lubication) Smalle defomation unde compession Oil film is not disupted and fiction coefficient emains low duing sliding action. Withstands fequent stats and stops. 299