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Make sure your motor is a "sealed" design. Most treadmill motors are not, and will fail eventually from metal dust getting into the guts of the motor. I had one when I first set up my grinder -...

I pretty much agree with all of the above. My rig is variable speed. I have gone as high as 3000 rpm for rough grinding before heat treat, and some of the other things I use my belt grinder for,...