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Re: CIM Hub
Our intake is a belt driven CIM drive (16 tooth drive gear and 56 driven gear). We didn't use a keyway but just put a set screw in the keyway slot and another set screw 90 degrees away on the shaft. It seems to work ok. You definitely don't want to do this for higher torques but it's not horrible for a low torque application.
-Vivek
p.s. My point is that you don't need to use a keyway as long as you're careful.
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