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| Sandpaper on the commutator is the technique that has been used for centuries. By pulling the sand paper in the rotation direction of the armature, the rocking of the brush in the holder is accommodated which usually makes the end of the brush not perfectly centered on the curve on the commutator. The wood commutator smaller than the copper commutator shouldn't be any smaller radius than the thickness of the sandpaper but working outside the starter doesn't allow for the rock of the brush in the holder from the torque of the friction riding on the commutator.
Mica 1/32" below the copper is fine, just that when the brushes are worn out, usually parts of the commutator are worn enough that getting the commutator back cylindrical takes it down that for and then the mica needs to be shortened because it is harder than the copper and as the copper wears the mica kicks the brush away from the commutator causing arcing that burns the commutator and the brushes much faster.
Gerald J. | |
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Question about Delco Remy starters
