I've got a Delta 12" drill press (11-990) with a min speed of 620 rpm. I've got a 3 1/2" hole saw that I want to use in the drill press, but it's max speed is 140 rpm. I've called Delta and they don't have any other pulley arrangements that would reduce the speed. I've looked at a router electronic speed control but the info says they work only with motors with brushes - my drill press is a 1/3 hp induction motor without brushes. I don't want to do this job (many holes) using a hand drill - am I just up the creek?
Any suggestions would be greatly appreciated - thanks in advance.
Les