Text from page 190 of catalogue Super Precision Bearings
Page 190 of catalogue Super Precision Bearings of Schaeffler Technologies GmbH & Co. KGEngineering
The speeds attainable by a specific bearing arrangement depend on the overall energy balance of the system. The number of bearings, their position, internal stress (clearance or preload), external stress and lubrication on the one hand as well as the heat dissipation conditions on the other hand are the decisive factors here. The attainable speed figures in the bearing Tables are guide values that may be higher or lower, depending on the mentioned conditions.
Factor fr Bearing preload L M H
Large bearing distance 0,85 0,8 0,75 0,75 0,7 0,65 0,5 0,5 0,45
Small bearing distance 0,75 0,65 0,65 0,72 0,54 0,6 0,5 0,5 0,57 0,4 0,35 0,3 0,3 0,37 0,37
Spindle bearings The attainable speeds stated in the bearing tables are an indication of the speed-ability of elastically preloaded single bearings. These speeds are not attained by rigidly preloaded bearings, bearing pairs or groups. The reduction factors to be assumed here are shown in Table 14.
14: Speed reduction (n* · fr) for spindle bearing sets
Cylindrical roller bearing For cylindrical Roller bearings the attainable speed is determined through the adjusted radial clearance. See Table 8, page 210 in section Mounting guidelines for corresponding indications.
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