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Originally Posted by Frank(Aflak)
drill motors are more powerful. I'd suggest stick with them (no need for gearbox, also, use the included tranny!)
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Well, if you look at the spec sheets, the motors actually have really close power. The upside for the drill is that it comes with a handy dandy gearbox that reduces the crazy speed of 19,670 to something less than that (haha yea, I've never used the drill gearbox on a transmission, so I wouldn't know off the top of my head). The great part about the CIM motor is that it delivers lots of power, is smaller than the drill and its gearbox, and runs at a pretty low speed. Its free load speed is 5346 rpm, and its top load is 2680-ish, so just do the math. Ex: You want to go 10 feet per second, on 6 inch wheels. 10ft/s x pi x diameter = rp/sec. For this example, it would be about 6.4 rotations per second, or 380 rpm, at the wheels. You've got a running speed of about 4800 rpm at the motor, so do the math. You need about a 12.5 to 1 gear reduction. Using that, figure out what gears to use, and throw them together with some aluminum plates, and you've got yourself a drive train. Yea... but put a little more time into the calculations than I did. The process becomes a bit more complicated when you have multi-motor transmission, because you haveto gear the motors together, and that gets ugly. But.. the CIM motors are very good motors to use on a dive train, so good luck.