The effect of ball bearing cross-sectional geometry (ring stiffness) on spalling fatigue life of bearings under heavy radial load was investigated experimentally. For a circular undercut design, the particular case tried, the fatigue life was significantly increased, supporting the proposal that an “undercut” below the raceway is desirable. Static load tests showed that force oscillations are reduced in the more flexible bearing. Hence bearing-induced vibrations should be reduced.

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