Being lazy, I like to use a grinder to prep cutting edges. Works great until I try to grind off that last little bit. Being somewhat inept, I invariably burn a corner. So I tried this: turn off the grinder! And it works pretty good. I have a 6″ Baldor, an awesome grinder, it spins forever when turned off, so I let it get up to speed, turn it off and grind away for a few seconds, check the edge and repeat. Not more burns when chasing the edge.