I have acquired a dc variable speed motor from a treadmill that I will be using on my KMG grinder. I can make it work by using the whole control panel, which includes several programs, etc., and might make an interesting conversation piece,but - I'd rather just have a reostat to control the speed and junk what is not necessary. I'm not an electrical engineer, so I don't want to start messing with something I know nothing about and screw it up. Anyone out there who has already invented the wheel that could help me out? Feel free to reply directly to skipnord@comcast.net