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Component Testing: Commutator

  1. If out-of-round is more than .002" (.05 mm), turn the commutator on a lathe until out-of-round is within specification.
  2. Wear or cutting limit of commutator is 1.08" (27.5 mm).
  3. If worn less than .008" (.20 mm), insulating mica should be undercut to a depth of approximately .015-.031" (.40-.80 mm).
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