Whining from a diamond wheel grinder

I have a baldor #500 diamond wheel grinder. I noticed something yesterday that I did not like. Sometimes, though by far not every time it is started, it produces a "whining" noise, at high frequency like "waah waah waah" etc. Not constant, but more like oscillating whine. Most of the time I start it, it does not do it. Why would that be happening? Any idea?

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Sounds like a bearing noise. This is a single phase unit, right?


Reply to
Grant Erwin

It's starting to rock 'n' roll :-).


Reply to
Christopher Tidy

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