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Which measurement records the condition of a used gear set?

  • A.The backlash alone
  • B.The temperature reached during a road test, which indicates whether the set is running with excessive friction
  • C.The wear pattern on the tooth flanks
  • D.The weight of the crown wheel, which decreases as the material is worn away from the flanks during service

Answer: C

Examining the flanks for pitting, spalling, scuffing and the position of the wear pattern reveals both the condition and the history of the setting. Backlash is measured as well but tells less. The pattern is photographed before dismantling on a serious investigation. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Reading the definition literally, rather than recalling a summary, avoids the usual confusion.

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