Ok you 'lectrical smarties...
I've got an old Craftsman "1/4 Horsepower Grinder": 2.5 Amps, 125 volts, 60 Hz. It won't run. When I turn it on, it just hums loudly, and occasionally seems to try to turn with just a small bump of the wheels - and when it does, it seems as if sometimes they bumps one direction, and sometimes the other.
The wheels spin freely with no resistance, in either direction, whether the power is on or off, even when it's humming loudly.
Any ideas of what to check for? Or is it a paperweight?
Here's a pic of the panel - gosh, I hope that's not blood!