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It's a kind of magic...

A project log for MPRT - Modified planetary robotics transmission

The reduction of strain-wave, but using a 'single' stage planetary gearset.

daren-schwenkeDaren Schwenke 04/06/2019 at 18:190 Comments

I'm beginning to deduce some of the magic required here to make the gears mesh.

I stumbled upon a compatible gear set by accident originally, but now I think I understand what is actually going on.

The rules:

So basically... for 3 planets I will need multiples of 6 for both the sun and ring gear tooth count.

For the test I've settled on 18 sun teeth, 60 ring teeth, and 57 output teeth.  

Planet tooth count is a always a function of the sun/ring tooth count and ends up being = (<ring_tooth_count> - <sun_tooth_count>)/2.  So for this test, they will have 21 teeth.

I increased my pitch a little so it still fits on a Nema 23, from 0.965 to 1.05 and I'm using a pressure angle of 24.

This is what that looks like.

Sliced.

Printing.

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