frank how do you design them? eg do you generate the gear
mathematically and what cad software do you use?

regards

Andrew

On Wed, Apr 1, 2020 at 8:19 PM Frank Tkalcevic <fr...@franksworkshop.com.au>
wrote:

> > https://www.youtube.com/watch?v=Eds48L4cJjM
>
> In those designs, I've always been concerned that the moving part of the
> gear rubs against the outside lobes.  This repair video shows a Sumitomo
> Cyclo which uses rolling pins on the outside, so minimal friction...
>
> https://youtu.be/H_oMVO_OTGs?t=157
>
> (There's another video out there that shows an exploded view of this, but I
> couldn't find it).
>
> I used this idea for some 3d printed hypocycloidal gearboxes for a robot
> arm, using bearings for the outside pins.  It works, but the plastic is a
> bit squishy - on the TODO list is to cnc machine them out of aluminium,
> which shouldn't be hard as they are 2 1/2D parts.
>
>
>
>
>
>
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