The Shop > Electronics & IC Programing
motor brushes
speedibee:
I repalced the brushes in my angle grinder , they only lasted about 15 seconds and there was nothing left just the springs . any ideas why
ddmckee54:
There could be a couple of possible reasons for this:
1) Did you use the exact replacement brush, or was it a hardware store "equivalent" that was the right size?
2) You could have a bad/rough spot on the commutator that basically ate the brushes while the motor was turning. Angle grinders live in a fairly harsh environment so this is a good possibility. Bet it made a helluva light show while it was running.
3) Could the brushes have been installed incorrectly? Some brushes are set up to be installed in one direction only. Installing them backwards will reduce their lifespan - but it shouldn't reduce it THAT much.
4) Bad/damaged brushes that were really-really soft and crumbly? Not likely, but it COULD happen.
Don
PekkaNF:
Also: Wrong type of brushes - automotive (low voltage) brushes are different from mains voltage brushes, but then commutator should be a write off as well.
Pekka
speedibee:
they are cheapo's off ebay , amazingly after scrapping 3 sets the comm looks like new
John Rudd:
Brush composition is determined by application...Spring pressure is another important factor..
Your best bet is go to a brush maker, tell them the make/model etc....
These people for example...
https://www.carbonbrush.co.uk/
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