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AXIAL-RADIAL CYLINDRICAL ROLLER BEARINGStRTCgt/2Fastening boltsRemoval ThreadRadial Tilting Rigidity Friction Fastening Bolts Weight Bearing CodeRigidity Torque Thread Tightening TorqueNominal Bolt QualityS r S k S k1 M r Diameter 8.8 10.9 12.9max.kNm/mrad Nm Nm kg FAG3.0 10 1.6 1 M5 6 8.5 10 2.0 RTC0804.5 37 6 4 M5 6 8.5 10 4.0 RTC1006.0 65 11 5 M6 10 14 17 5.0 RTC1207.5 83 14 7 M6 10 14 17 5.8 RTC1507.5 125 21 9 M6 10 14 17 8.0 RTC1806.5 160 27 11 M6 10 14 17 9.3 RTC2008.5 320 53 16 M8 25 34 40 18 RTC2608.0 630 105 27 M8 25 34 40 25 RTC32514.0 1100 185 42 M8 25 34 40 33 RTC39516.5 1700 285 55 M8 25 34 40 48 RTC46020.0 3400 570 133 M10 50 70 85 84 RTC58022.0 5000 830 183 M12 85 120 140 169 RTC65020.0 9600 1600 295 M16 200 290 350 236 RTC85022.0 12500 2100 366 M16 200 290 350 270 RTC950Enhanced-precision design, reduced axial preloadRTC325.T52EASee Bearing Code, page 206FAG · 133
LIFE CALCULATION FOR SUPER PRECISION BEARINGSLife Calculation for SuperPrecision BearingsSuper precision bearings must locatemachinery components withhigh accuracy and support loads atup to very high speeds. They arepredominantly selected for their• accuracy• rigidity• running behaviour.These demands can be met overan expected life span only if nobearing wear occurs. This is dependentupon the generation of asupportive hydrodynamic lubricantfilm in the rolling contact area. Underthese circumstances rollingbearings achieve ultimate life in avariety of applications. From theload point of view, the stress occurringin the contact points aswell as the bearing kinematics areof decisive influence on bearingservice life. Therefore the traditionaldesign in keeping withDIN ISO 281 has proved inexpedientwhile the modified life calculationcomes closer to field experience.Yet especially for high-performanceunits it is better to determineindividual bearing arrangementswith the help of special calculationprograms.Bearing LoadDynamic EquivalentLoad PFor dynamically loaded bearings,the loads are combined into a dynamicequivalent load P. This is theconstant load derived from• combined load (radial and axial)• temporarily alternating loadsto give the same calculated life asthe actually acting combined load.For bearings that can accommodateradial and axial load components,the equivalent load is calculatedusing the equationP = X · F r + Y · F aThe factors X and Y are derivedfrom the ratio of F a /F r compared tothe bearing specific factor e.Spindle BearingsContact Angle α = 15°F a /F r ≤ eX = 1, Y = 0.F a /F r > e (Tables 14 and 15)P = 0.44 · F r + Y · F aContact Angle α = 25°With bearings of α = 25°, the contactangle changes very little evenunder axial load and therefore theaxial factor Y is taken as a constant.F a /F r ≤ 0.68P = F rf 0 · F a Spindle Bearingsi · C 0α = 15°e X YF a /F r > 0.68P = 0.41 · F r + 0.87 · F a0.3 0.4 0.44 1.40.5 0.43 0.44 1.310.9 0.45 0.44 1.231.6 0.48 0.44 1.163 0.52 0.44 1.086 0.56 0.44 1i = number of bearings that accommodate the axial load14: Radial and axial factorsFAG · 134
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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
Page 83 and 84: 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 131 and 132: AXIAL-RADIAL CYLINDRICAL ROLLER BEA
Page 133: AXIAL-RADIAL CYLINDRICAL ROLLER BEA
Page 137 and 138: 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
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SPINDLE BEARINGSCalendar weekof pro
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BEARING CODE SPINDLE BEARINGSB 70 0
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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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BEARING CODEANGULAR CONTACT THRUST
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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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