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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 to restore surface. Commutator runout must not exceed 0.016" (0.40 mm).
  2. Minimum diameter of commutator is 1.21" (30.7 mm). Mica depth on all models should be 0.016-0.031" (0.40-0.80 mm). The minimum mica depth is 0.008" (0.20 mm). If beyond minimum, undercut with a hacksaw blade to standard depth.