It was easier to model in Freecad than I expected.  I'll try to attach a jpg of 
it and see if it goes through.

And if it doesn't go through a link to it on my Google drive.
https://drive.google.com/file/d/1_eSu-olALMsevTnOpzQ1o1r_rPjfexwU/view?usp=sharing

Here is a link to the Freecad file (Freecad v0.18).
https://drive.google.com/file/d/1GGwG9nzmYowKeuMAWMvOExeGrvSzZCnY/view?usp=sharing


Todd Zuercher
P. Graham Dunn Inc.
630 Henry Street 
Dalton, Ohio 44618
Phone:  (330)828-2105ext. 2031

-----Original Message-----
From: Andy Pugh <bodge...@gmail.com> 
Sent: Thursday, December 02, 2021 6:40 PM
To: Enhanced Machine Controller (EMC) <emc-users@lists.sourceforge.net>
Subject: Re: [Emc-users] Harmonic Drive

[EXTERNAL EMAIL] Be sure links are safe.

> On 2 Dec 2021, at 21:14, Todd Zuercher <to...@pgrahamdunn.com> wrote:
>
>  What if you used two outer ring gears of the same diameter one with one 
> fewer teeth.  Then have 4 sets of planetaries  stacked in pairs.  Each pair 
> would be pinned together

You can just use pinions twice as long as the ring gears. I think I have seen 
this done

It would work with all-external gears too.




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