Hi Jeremy. This is a very interesting thread. What do you mean by "always grind off an edge"? Do you mean run the wheel so that it is pulling away from the metal? Or, do you mean, if there is an edge, make sure to grind it off? I think it is the first one. Thanks.
I am very scared of power wire brushes and have removed and discarded any from garage sale grinders that I have picked up. But when I was in metal shop, the teacher did not stress the risk much. He said that abused screwdrivers caused many more injuries.
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