We actually have a version of the math worked out that takes into account the movement of the chain on the sprocket. It was developed by Keith Selbo who has made all of the major math contributions so far.
I haven’t implemented it yet because there has always been a more pressing issue and it seemed like it might be rocking the boat to make a big change like that without being careful.
Here’s the write up:
triangle plotter.pdf (92.7 KB)