Posted by Owen Aaland on March 20, 2012 at 09:16:45 from (216.47.34.188):
In Reply to: Super M Starter posted by Wayne Adams on March 20, 2012 at 08:44:02:
Do not undercut the mica on the starter armature. The brushes used in the starter have a high copper content and are hard enough to wear down the mica as the commutator wears. If you undercut the mica the material worn off the brushes can fill in the grooves and short out the armature.
Generators are just the opposite. on those the mica must be undercut because the brush material is mostly carbon and is too soft to wear down the mica. This will cause the brushes to lose contact with the commutator and arc which causes poor contact with the rest of the commutator.
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