[66hades]

I had the same question when I was learning g&m code, the answer I found was don't worry about it lol. I applaud your effort to build an in house CAM software, my old boss did something similar with Autodesk so I know it is possible. As for an solution, you might want to check out linear approximation in calculus. I'm not sure if it would be applicable, but it does turn curves into tangent lines.