Belt Driven Drive Trains

[Aren Siekmeier]

Originally Posted by Thad House

Even still, that is 4x greater then what the numbers Austin posted say belts can take. If a 15mm 24T pulley can only take 70 in-lb, teams would be snapping them all the time even with 2 CIM drives.

I'm suggesting even 200 in-lbs is probably very high (I said max). Remember it's also assuming ALL of the robot's weight and drive power is going through ONE belt (not two or three, or through a direct driven wheel as well). Typical loads are probably closer to 100 in-lb, with rare edge cases pushing it no higher than 200. 971's 24 tooth GT3 can handle that.

2 or 3 CIMs isn't the issue. Force on the transmitting belt maxes out when the wheel starts slipping, regardless of the transmission's stall torque.

And we have seen that 24 tooth HTD drives can and often do slip under full load. Many belt drives either use GT2/GT3 or use larger pulleys (30 or 36 tooth).