> OK,
> I recognized the obvious solution to the Outer Circle intersection, implemented
> a practical While Loop to terminate the involutes, used a Lohmueller segment of
> a torus to connect the roots of the teeth, and topped off the teeth with a
> straight cylinder.
>
> Looks ok with teeth of 36 and 60, although I expected the teeth to be thicker
> and have less space between them in meshing gears.
>
> Still need to ponder visualizing the "line of action" where the teeth mesh.
> Also need to figure out how best to do this in CSG,
> and what curve works best for doing this in SVG.

It's been over a decade since I did this stuff at University, and a good 
few years since I used it at work. However I did find this link in my 
"useful" folder on my work PC, maybe it helps in some way:

https://www.bostongear.com/pdf/gear_theory.pdf

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