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The contamination of lubrication with powdered stone resulted in progressive wear of the internal surfaces of a bearing. Because of the motion of rollers, the inner race exhibited an unusual cyclic washboard wear pattern. Because of a lack of bearing conformity, wear progressed into severe coarse-grain spalling.

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H.W. Walton, 2019. "Failure of Large Screen Spherical Bearing-Crushed Stone", ASM Failure Analysis Case Histories: Failure Modes and Mechanisms

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