"Sam Goldwasser" wrote in message
...

| | I have a bench grinder that seems to have such a fault. I have
eliminated
| | mechanical causes as best I can and it still intermittently stops and
| | hums loudly when the rotor gets hot.
|
| Bearings?
|
| That's what I thought originally but I couldn't find any problems.

If it's a cap run motor maybe the cap is shorting, otherwise a shorted turn
in the motor I think.

NM