Spurred on by the warm support of my New Best Friend (Swiss), tonight I thought I'd continue on my investigation into the three Meltdown motors I have been kindly donated, like this one
Not being an Ostrich, I don't believe in sticking my head into the sand and hoping **** goes away
None of the motors I broke down had trimmed or cut brushes
The only thing I could see that they had in common was they each had bad blackening buildup from arcing on ONE com gap. I grabbed one and put it in the lathe and trued up a light cut to see what the result was.
Turns out one com segment was proud, and the first cut only took the surface off the one segment.
So I did the same to the other two. Almost identical result.
It's not definitive, it could be that
1. All 4002 motors have a proud com segment
2. Maybe the heat from the short through one segment swelled it slightly
3. Push start/melting motors are what they are because they have an elliptical uneven com (what I said from the start)
Draw your own conclusions. I've stubbornly drawn mine....you don't CURE headaches with Tylenol, NBF...
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