Commutator Test
- Clean surface and polish with No. 400 sandpaper if required. If surface is scored, out of round or pitted, turn commutator in a lathe.
- Maximum commutator runout and minimum diameter of commutator must not exceed specification after turning. See COMMUTATOR SPECIFICATIONS TABLE .
- Commutator mica undercut depth should be .020 -.030" (.50 -.80 mm). Minimum mica undercut depth is .008" (.20 mm). If not within specification, undercut to standard depth.
COMMUTATOR SPECIFICATIONS
| Application | Maximum Runout In. (mm) | Minimum Diameter In. (mm) |
|---|---|---|
| 929 | .002 (.05) | 1.13 (28.8) |