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Need Electric Motor advise and question
August 27, 2011
4:05 am
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greeney2
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I have a harbor frieght 10 in bench grinder, mounted on a pedistal. Its a 120V, 2hp motor, which they do not make anymore. A few years ago it fell over, moving it, and the motor would not start unless you helped it by spinning the wire brush. I have the left side a grinding wheel and right side a 10 inch wire brush. That worked when the wheel were worn and small, but when I put new ones on, the additional weight was harder to get going, so had to spin the wheel faster and faster to get it going. Over time, the wheels would go, but took them longer and longer to gain speed to finally spin fast.

Question is, did dropping it damage the capaciter starter, which started the initial problem. Or is the motor just going out, as it progressivly has taken more and more spinning of the wheels, and longer times to get spinning full speed?

I'm thinking the capacitor is probably bad, plus maybe the motor needs rewinding. Not even sure if these kind of motors have brushes or not, bt maybe not touching the comuntator, since I can't make it spin on its own now. I was shocked to find 10 inch, 2hp grinders are not cheap. Even know this was harbor frieght, and I used the heck out of it, are they worth rebuilding.

Any opinions?

September 7, 2011
12:10 am
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greeney2
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Got it fixed. After trying a new capacitor and still not finding the problem, took it to a moter rebuilder. Turned out I was close, it was the capacitor switch inside the motor. Works perfect now, and glad it does. They don;t make the 2hp 10" wheel model anymore, and comparable grinders are about $450 new for that size. Happy ending for $60.

September 7, 2011
3:13 am
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bionic
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dropping it, probably didn't help matters, just syaing..
it's like saying, 'I broke this, why is it broke?"

KWIM?

glad it's not broke anymore, after all.

Willie Wonka quotes..
What is this Wonka, some kind of funhouse?
Why? Are you having fun?
A little nonsense now and then is relished by the wisest men.
We are the music makers, we are the dreamers of dreams

September 7, 2011
3:40 am
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greeney2
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It all happened when I tipped it over, and the impact broke the switch inside. Until now I could just spin the wheel by hand a little and it would go. So I just put up with it for 2 years, instead of doing this when it happened.

Its called procrastinating! I'm very good at that! Laugh Laugh

September 7, 2011
4:39 am
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bionic
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me, too..about procastination, it's like a hobby for me..maybe even an artform at this point
Laugh

Willie Wonka quotes..
What is this Wonka, some kind of funhouse?
Why? Are you having fun?
A little nonsense now and then is relished by the wisest men.
We are the music makers, we are the dreamers of dreams

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