Grant Erwin wrote:
I have a little Rockwell 3-phase grinder I picked up recently. It had
been wired completely wrong and today I rewired it and it runs smooth as
glass. I have the same problem with it that I have had with every bench
grinder, though. The shaft spins one way, so the wheels rotate down
towards the tool rest. The nut on one end of the shaft is RH and the nut
on the other end is LH. If I put a wrench on both shaft nuts and crank,
one will loosen. The question is, how do I loosen the other one? I can't
for the life of me see why grinder manufacturers don't put a hole you
can put a pin in to lock the shaft for changing wheels. I sure don't
want to put Vise Grips on the naked threads - what is the trick I'm
missing?

GWE

I've always wedged a stick of wood between the guard and the grinding
wheel. Never fails for me.