Bead belt gear, clamping

by vik, published

Bead belt gear, clamping by vik Aug 29, 2009
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Bead belt gear, clamping by vik is licensed under the GNU - GPL license.

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This is a beaded belt gear for 4.5mm chain that clamps onto a 5mm NEMA17 motor shaft using an ordinary hose clamp. It's designed to use a flat on the motor's shaft, but you can change that in the source files provided to fit just about anything.


Print, clean up, file a flat on the motor's shaft if necessary. Fit the hose clamp loosely over the collet. Put the thickest quadrant of the collet over the flat on the shaft, and push the gear onto the shaft - the hole tapers. When it's at the right level, just do up the hose clamp. The gear will be held in place quite securely.

In PLA the hose clamp may crush the collar, or may simply foul on the surroundings. In that case, just epoxy it onto the drive shaft.

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I just realized that as a kid a had a ballchain that were just a cotton thread with plastic beads meted along it. Have you investigated such and do you think it could be printable.

I've looked at plastic ball-chain. Not sure if it'll be sufficiently durable.

Cotton thread also stretches, maybe too much. The advantage of ball chain is that at its maximum extent it doesn't stretch much.