Re: Electric die grinder
You can only use the die grinder with small tools like cartridge rolls and felt bobs, unless it's variable speed - and if you slow it down it won't have the torque for 4" wheels.
Air die grinders run too fast as well, although you can vary the speed a bit with an artful trigger finger - but the above would still apply.
Flex shafts are great, but do not get the skinny Harbor Freight one - it'll twist up on you and last a few hours at most. My commercial-duty shaft is over an inch in diameter and runs in bearings.
When I'm not using the shaft for 4"+ wheels, I use an air-operated drill (don't bother with electric drills unless they're commercial-duty...they'll burn out right quick). It's got plenty of torque, the correct speed, and cost about $30.
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