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Bench Tests: Commutator

  1. Clean surface and polish with No. 400 sandpaper if required. If surface is scored, out of round or pitted, turn commutator in a lathe.
  2. Standard commutator runout is .0020" (.050 mm) Maximum commutator runout is .004" (.10 mm).
  3. Commutator mica undercut depth should be .020-.031" (.50-.80 mm). Minimum mica undercut depth is .008" (.20 mm). If not within specification, undercut with a hacksaw blade to standard depth.
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