In article kh2le.18395$wr.1289@clgrps12, Ray Field says...

This is more electrical than machine shop but somewhere in the collected
wisdom of the group will be an answer.
Normally an electric brush type motor will have "no"sparking at the
armature, what does sparking indicate and what is the cure.
This occurred on a built-in vacuum cleaner motor. Relay/switch module
failed, bypassing the module allowed the motor to run normally. Pulled the
brushes, lots of brush left and free movement - reinstalled brushes in same
position lots of sparks.
All advice appreciated.

Did you put the brushes back in *exactly* the same way they came out?

Ie, left brush in left holder, right brush in right holder, and each
one not flipped 180 degrees around its long axis?

They do tend to wear in with an assymetric radius at the working end.
If one went in flipped, it might spark until it wears in again.

Jim


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