- To improve running accuracy by reducing runout of shaft, as well as to heighten position accuracy in radial and axial directions.
(Bearings for machine tool spindles and measuring instruments)
- To improve gear engagement accuracy by increasing bearing rigidity.
(Bearings for automobile final reduction gears)
- To reduce smearing by eliminating sliding in irregular rotation, self-rotation, and aroundthe- raceway revolution of rolling elements.
(For high rotation-speed angular contact ball bearings)
- To minimize abnormal noise due to vibration or resonance.
(For small electric motor bearings)
- To keep rolling elements in the right position relative to the raceway.
(For thrust ball bearings and spherical thrust roller bearings used on horizontal shafts)