OEM No/Model: Single Row Angular Contact Ball Bearing
Single Row Angular Contact Ball Bearing
Preload and Rigidity
Regarding the rigidity of machine tool spindles, bearings can be considered as springs. When an axial load is applied to the spindle, axial displacement is
determined by the axial rigidity of the fixed end bearings.
Cylindrical roller bearings are generally used to support radial loads while angular contact ball bearings are used to sustain axial loads.
The bigger the contact angle of the angular contact ball bearings, the higher the axial rigidity.
Bearings of the same bore size, which have more rolling elements (diameter series 0
or 9; or BNR10 or BNR19 series), have higher rigidity, even though the diameter or
the rolling elements is smaller.
Normally, preload is applied to bearings in order to increase rigidity of machine tool
spindles. But excessively high preload will result in flaking and possible seizure.
Many users increase rigidity by using a combination of two or more angular contact
ball bearings.
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