Question about Saws
If the brushes are long enough, severe arcing is often CAUSED BY FAILURE of one of the windings on the armature, NOT the stator.
Either an open or shorted winding will cause this. Use an ohmeter between adjacent segments to check the resistance. The resistance can vary by say, 10%, but if you find one pair that is outside that a bunch, look for broken wire near the commutator that you might repair, but beyond that, you usually have to replace the armature.
Posted on Sep 04, 2009
Testimonial: "Thank you for input. Shorted armature is what I expected but I never had one act just like this before. Usually the motor won't get up to speed. "
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Posted on Jan 02, 2017
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