SCR Motor Speed Control made from salvaged parts

[Paul Jones]

PJs - thanks for the spec confirmations. Yes, the heat sink was cut from a piece of scrap aluminum sheet and the corners thinned a little to allow bending without breaking. It is crude but effective. Years ago, I would use the motor speed controller for a one-speed saber saw for cutting metal and the controller would become extremely hot but never burned out. Now I use it for the Unimat lathe which has very little load on the controller so that is probably why it has lasted so long (see http://www.homemadetools.net/forum/m...00-lathe-10111 ). Thanks, Paul