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Bore Factor f 0Reference Bearing SeriesNumber B718C B719C B70C B72C HS719C HS70CHCB719C HCB70C HCB72C HC719C HC70CXCB719C XCB70C XC719C XC70C00 14.9 14.2 12.6 12.3 15.3 15.501 15.4 14.7 13.2 12.9 15.7 15.502 15.9 14.5 14.1 13.6 15.8 15.803 16.2 14.8 14.3 13.9 16 15.904 15.9 14.2 14.3 13.8 16.2 16.105 16.4 14.9 14.9 14.4 16.5 16.206 16.4 15.4 15.1 14.3 16.4 16.307 16.2 15.9 15.4 14.6 16.4 16.508 16 15.5 15.7 14.2 16.2 16.509 16.2 15.8 15.5 14.2 16.3 16.510 16 16 15.7 14.4 16.2 16.511 16.2 16 15.5 14.5 16.1 16.512 16.3 16.2 15.6 14.4 16.2 16.413 16.1 16.4 15.9 14.5 16.1 16.414 16 16.2 15.6 14.6 16.1 16.4FD Bearings andCylindrical Roller BearingsFor FD bearings and cylindricalroller bearings in super precisiondesignP = F r .Angular Contact ThrustBall BearingsAngular contact thrust ball bearingsare not suited for radial loadF r > 0.47 · F a . Small radial loadcomponents are not taken intoconsideration when calculating theequivalent load.P = F a15 16 16.3 15.8 14.8 16.1 16.316 15.9 16.4 15.7 14.8 16.1 16.317 16.1 16.3 15.9 14.9 16 16.318 16.1 16.4 15.7 14.8 16 16.319 16 16.4 15.9 14.9 15.9 16.320 15.9 16.5 16 14.5 16 16.221 15.9 16.4 15.9 14.5 15.9 16.322 16.1 16.4 15.8 14.5 16 16.224 16 16.4 16 14.9 15.9 16.326 16.1 16.4 15.9 14.7 15.9 16.228 16 16.4 16 1530 16.1 16.3 16 15.332 16 16.4 16.2 15.334 16.1 16.5 15.9 15.436 16 16.4 15.7 15.438 16 16.4 15.9 15.240 15.9 16.2 15.8 15.444 15.8 16.4 15.7 15.348 15.9 16.5 15.9RTC BearingsThe dimensions of RTC bearingsare directly oriented to their mainapplications in machine tools. Forspecial applications it is advisableto determine the loads with suitablecomputer programs, for instanceSPICAS 2000.In generalP = F aP = F rfor the axial roller rowfor the radial roller rowEngineering15: Factor f 0 for spindle bearings with a contact angle of α = 15°FAG · 135
LIFE CALCULATION FOR SUPER PRECISION BEARINGSEquivalent Load withVarying Loads andSpeedsFor bearing arrangements that aresubject to varying loads andspeeds, the equivalent load is calculatedfrom the individual loadsand speeds with their correspondingpercentage of time:3n 1and the mean speed n m from:q 1q 1q 2P =P 13 ·n·100+ P 23 · · + ... [kN]m 100n m = n 1 · + n 2 · + ... [min -1 ]100 100n 2n mq 2Static Equivalent Load P 0For super precision bearings thestatic load, i.e. loading in the absenceof ring rotation, is rarelychecked. The stress index f s as ameasure of the static load is obtainedfromf s = C 0 /P 0f sC 0P 0= static stress index= static load rating [kN]= static equivalent load [kN]For the modified life calculation,factor f s* is also obtained from thefollowing equations, however usingthe dynamic loads.In order to maintain the accuracyof the bearings, the static stress indexshould be higher than 3.0.Only with an extremely short-termand centric axial load (tool ejectionforce), f s ≥ 1 is admissible for hybridbearings.Angular Contact ThrustBall BearingsP 0 = 3.98 · F r + F aThe static stress index should behigher than 2.5.Double Direction Angular ContactThrust Ball BearingsSpindle BearingsP 0 = F aContact angle α = 15°P 0 = F r [kN]for F a /F r ≤ 1.09P 0 = 0.5 · F r + 0.46 · F a [kN]for F a /F r > 1.09Contact angle α = 25°P 0 = F r [kN]for F a /F r ≤ 1.31The static stress index should behigher than 2.5.FD Bearings andCylindrical Roller BearingsP 0 = F rThe static stress index should behigher than 3.0.P 0 = 0.5 · F r + 0.38 · F a [kN]for F a /F r > 1.31Where there are several bearings,the load is calculated for the individualbearing.An axial load is evenly distributedon the loaded bearings.RTC BearingsP = F aP = F rfor the axial roller rowfor the radial roller rowThe static stress index should behigher than 3.0.FAG · 136
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PRECISIONTECHNOLOGYINSIDESUPER PREC
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CONTENTSPrecision Technology Inside
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PRECISION TECHNOLOGY INSIDEOptimum
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PRECISION TECHNOLOGY INSIDEProduct
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SPINDLE BEARINGSFAG spindle bearing
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SPINDLE BEARINGSDIRECT LUBE Bearing
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SPINDLE BEARINGSB NS NS BB Nr ar br
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FLOATING DISPLACEMENT BEARINGSThe f
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FLOATING DISPLACEMENT BEARINGSr ar
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FLOATING DISPLACEMENT BEARINGSr ar
Page 85 and 86: SUPER PRECISION CYLINDRICAL ROLLER
Page 103 and 104: DOUBLE DIRECTION ANGULAR CONTACT TH
Page 113 and 114: ANGULAR CONTACT THRUST BALL BEARING
Page 129 and 130: AXIAL-RADIAL CYLINDRICAL ROLLER BEA
Page 135: LIFE CALCULATION FOR SUPER PRECISIO
Page 139 and 140: LIFE CALCULATION FOR SUPER PRECISIO
Page 145 and 146: LUBRICATIONGrease LubricationL210 i
Page 147 and 148: LUBRICATIONGrease LubricationGrease
Page 149 and 150: LUBRICATIONOil LubricationMinimal O
Page 151 and 152: TOLERANCES FOR SUPER PRECISION BEAR
Page 163 and 164: MACHINING TOLERANCES FOR MATING PAR
Page 173 and 174: SPEED-DEPENDENT FITSSpeed-Dependent
Page 175 and 176: SPEEDSSpeedsThe speeds attainable b
Page 177 and 178: DEFLECTION AND RIGIDITYDeflection a
Page 179 and 180: HANDLING OF SUPER PRECISION BEARING
Page 181 and 182: HANDLING OF SUPER PRECISION BEARING
Page 183 and 184: SPICAS 2000SPICAS 2000 - the PC Pro
Page 185 and 186: SPINDLE BEARINGSCalendar weekof pro
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BEARING CODE SPINDLE BEARINGSB 70 0
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FAG · 188
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BEARING CODEFLOATING DISPLACEMENT B
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BEARING CODESUPER PRECISION CYLINDR
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BEARING CODEDOUBLE DIRECTION ANGULA
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FAG · 200
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BEARING CODEANGULAR CONTACT THRUST
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FAG · 204
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BEARING CODEAXIAL-RADIAL CYLINDRICA
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NOTESFAG · 208
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Every care has been taken to ensure
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super precision bearings

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