i spent about 2 bombers worth of time with a grinder running back and forth loosely rubbing across them and switching the angle every now and then. I used it first time yesterday and it worked really well. Local shop was gonna charge 175 to knurl them so i gasped and went the grinder route.
ok so i have it running and crushing ok but it seems underpowered with at 24v power supply i had laying around. the motor is 90v. any ideas on how to power this with a few more volts. i have made 2 batches of beer with it so far and my efficiency seems ok, i also pass the grain through twice.