Lathe speed controller

I built a speed controller for my VFD equipped lathe that does the speed calculation using FPM, diameter, belt settings & more. The write up (pdf):
https://drive.google.com/file/d/1RVRYWK0fTt1ZXkKEJ06OwwCnFfWvgv1F/view?usp=sharing
if that's a problem: https://tinyurl.com/yd26ytg4
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