Hey Brian,
This is the path I got, and it does seem a little off. The orange curve is from your script. The cutup arcs are the path that should be a through point curve snaped to the mids to create the cycloid.

I havnt ran through the entire process yet to figure out the size of the rollers and how it relates to the spacing and the overall size yet. I have to run some things through first.

Talk later.