super precision bearings

Example:HCS71914E.T.P4S.ULSpeed n = 16000 min -1Actual dimension of inner ring:70 mm – 3 µm = 69.997 mm.The deviation from the nominal dimensionis indicated on the bearingring (see page 184).Hollow shaft of 35 mm bore (50 %of diameter)f w = 4.30 · 10 -9 (according to Diagram31 for bearing type s HS, HCand XC)n 2 · f w = 1.1The value 1.1 and curve “Hollowshaft 50%” (Diagram 29) resultin a required interference of9 µm.So the actual dimension of theshaft must be 70.006 mm to ensurethat the inner ring will still betightly located on the shaft at aspeed of n = 16000 min -1 .1,6 · 10 -71,4 · 10 -71,2 · 10 -71,8 · 10 -7 72 70 719f w[mm 3 ]1 · 10 -78 · 10 -86 · 10 -84 · 10 -8 2502 · 10 -800 50 100 150 200mmBearing bore [mm]30: Factor f w for the speed-dependent determination of the inner ring/shaft fit for bearing series B,HCB, XCB...C, E.T.P4S3.5 · 10 -8 803 · 10 -8 702.5 · 10 -82 · 10 -8f w[mm 3 ]1.5 · 10 -81 · 10 -85 · 10 -9 00 20 4060 100 120 mm 140Bearing bore [mm]719Engineering31: Factor f w for the speed-dependent determination of the inner ring/shaft fit for bearing series HS,HC, XC...C, E.T.P4SFAG · 173