I did some scouting at local pawn shops for suitable power tools w/ strong motors over the last two days. I ended up finding 2 14.4V Craftsman drills (each of which came with 2 batteries and a charger) and a 14.4 V Black and Decker circular saw (w/ 1 battery). Grand Total $140...Doh!


Next time I think I'll just buy identical motors...hopefully these last a while.
I've been scouting out all the other things I'm planning to use as well: steel base, wheels, axels, bearings, etc. I'm also working on a custom motor driver circuit which hopefully will be cheaper than buying a ready made one...yay shopping! I used a uC and the power MOSFET from one of the drills to rig a test circuit before I order the parts for the driver. Tests pretty much confirmed that I'm on the right track, but I'm going to formally design it to try and minimize screw ups. During the test the motor had enough torque to throw itself off the desk...I can't wait to get this thing on wheels :)
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