Michael A. Terrell wrote:
Christopher Tidy wrote:

Michael A. Terrell wrote:

Gunner, have you ever used a variable DC power supply and an ink
eraser to polish a worn commutator? I've done it to hundreds of vacuum
cleaner motors, as well as power tools. I connect the motor to the
power supply, then bring the voltage up slowly till the motor is
turning, slowly. Then I use the ink eraser to polish the copper
segments.

That sounds cool. Does the ink eraser just work as an abrasive, or is
there some chemical action. What chemical is in an ink eraser?



The ink eraser is very abrasive, compared to a normal eraser. It
will even remove minor scratches from the copper. try it sometime.
Most 120 VAC universal motors will run slowly on 8-14 VDC, and the
eraser is under a buck. Keep the speed as low as possible, to keep from
getting the eraser dust between the armature and the brushes.

Cool idea. Sounds like you could also use Brasso, except for the shock
risk and the inconvenience of getting it inside the motor!

Chris