I picked up a 14.4V cordless drill at the pawnshop the other day ($5, with battery!), but I'm having some trouble running it from my computer power supply that I've converted to use as a bench supply. To keep a continuous load on the PSU I'm using a 1157 automotive lamp on the 5V rail.
When I attach a large radial type motor to the 12V rail, I can attach, detach, and run it in both directions and it works just fine. It's been awhile, but I think I once tried to measure this motor as I stalled it, and I got up to 2A before my fingers got sore (never could stop it altogether!).
When I attach the drill, it will run but only if I squeeze the trigger before plugging in the PSU (tricking the PSU into thinking this is part of the normal load), but as soon as I release the trigger the PSU fails the same way as when one of the power rails are shorted. I know that some cordless drills have electric braking - is it something to do with that? Does anyone out there have any thoughts on what might be going on and how I can work around it? I'd like to be able to stop and start the drill, and change directions, eventually using an h-bridge. Thanks for reading!