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A nylon oil-lubricated driving gear showed pitting upon visual inspection. The pitting produced numerous surface microcracks. Further investigation (visual inspection and 37x images) supported the conclusion that failure occurred in association with large-scale fragmentation (frictional wear). No recommendations were made.

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Failure of a Nylon Driving Gear, ASM Failure Analysis Case Histories: Failure Modes and Mechanisms, ASM International, 2019,

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