Quote:
Originally Posted by Kevin Sevcik
DON'T DO THIS. That is, unless you've carefully considered the following.
Banebots suggests a maximum torque output of 85 ft-lbs for the P80 CIM gearbox. If your mechanism is actually going to require anything close to 576 ft-lbs of torque, you'd destroy a P80 gearbox rather quickly. And P80s are tougher than the P60, which is smaller with an aluminum ring gear. BB doesn't list the max recommended torque for the P60s, but it's going to be less. At least half, possibly a quarter. So I strongly urge you to look at the maximum safe output of your gearbox and make sure you plan your gear reductions accordingly. You may want to decrease the reduction in your gearbox and add an additional reduction stage of sprockets. 256:1 gear reductions provide surprisingly little torque once the gears have failed.
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Thanks for letting us know. We will probably switch to a 128:1 planetary and 4:1 sprocket in that case. At most we would need 130 lb-ft of torque to turn the arm. With 4:1 that means the gearbox should only need to put out 32.5 lb-ft of torque. That should be fine I think, but I'll ask Banebots if they have that info on the P60s.