i have, just as the other guys, used an angle grinder for "roughing in" a profile and then switching to a belt grinder. there was a few times i used it on my first few knives to cut them when i was using a grooving blade from a CNC machine that was already hardened and i didnt have the abiility to soften then reharden the steel. i just tok it slow to keep the temp down, cooling with water often, and it worked well.
good luck!! Chris S