Planetary flip!

[MrBenGriffin]

Loving this work.

In your "planetary.scad" demo on line 27 you should flip the sun - otherwise the profiling will fail. I think it would be more useful to others to add your herringbone() function to this example also. It's a beautiful thing.

Rx(180) Rz(180/sun_teeth*((planet_teeth+1)%2)) spur_gear(n=sun_teeth, z=10);

Here I am using a flattened spur gear to turn the ring into a thumb ring.

This is a really awesome repository, which would really do with some more documentation - mainly on how to set profiles, and use linespace for those who are not familiar with it. Your notes are good - but buried. The inclusion of the academic texts (for terminology) is very useful, but, while explains the 'why' - it doesn't so much explain the how! Also, even a tutorial for building up a gear chain would be awesome.