Quote:
Originally Posted by Thad House
Are those numbers actually in in-lb? Every time I've done the calculations, I get somewhere in the range of 480 in-lb of stall torque for a 3 CIM gearbox at 10 ft/s. A CIM by itself has 21 in-lb of stall torque. We've calculated in the past that for a 24T belt, that equates to a pulling force on the belts of about 700 lbs. Am I just doing my numbers wrong, or are those numbers actually supposed to be in ft-lb?
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They are in in-lb.
You aren't going to see 480 in-lb per drive side, the wheels will slip first. 150 lb / 2 * CoF * wheel radius is at most 450 in-lb with 6" wheels and a phenomenal CoF of 2.0. A more reasonable max is 200 in-lb (4" wheel, CoF of 1.3). You'd have to lock the wheel to get more than that.