Quote:
Originally Posted by M. Krass
Drew,
Sorry if there was confusion -- I should've made this more clear -- but we'll be using a steel key seated between the CIM shaft and the plastic spacers. Last season, we built clutches for the 256:1 Banebots gearboxes that were delrin and acrylic and included the key in the delrin parts. Those keys didn't last very long at all and repairing them on the fly would've been impossible if we hadn't realized early on that we'd made a really dumb decision.
I'm not sure if we'd see better results with a steel key into a plastic keyway, though. It could end up being six of one and half a dozen of another.
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I just ran an FEA w/ the plate being 3/8 thick. At just two times the stall torque of a CIM, the keyway already had a lot of deformation. I really don't think it could take the repeated shock loads of being in the drivetrainn.
I have a question though, If you can cut the keyway into delrin, why can't you cut it into Aluminum? You have a laser cutter, right?