I have 6 inch bench grinder set up with an 80 grit stone on one side and a 6 inch cutoff wheel on the other. Mounting the cutoff wheel on the bench grinder was one of my better ideas. Not sure why it took me so long to see that. I had been fighting with a hand-held grinder for quite a while. Much more accuracy mounted on the bench grinder, and safer. Plus, I can't even remember the last time I used a hack saw for cutting bolts, machine screws, and anything else as needed.
Mike
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Mike Lutz