[Michael82]

I got it all to work! Thank you!

I fine-tuned the pot on the board to output max voltage and that calibrated 12000 RPM to about 5v. The board outputs about 10.5v at 24000, but my VFD caps out at 400hz so that extra voltage doesn't overrun the spindle. Problem seems solved for now.

As for the reverse spin, turns out my VFD was programmed for INT mode, and once I modified the jumpers on the board, everything started working as expected! Thank you for your advice.

I think I am finally all set! Thank you for the superb customer service!

I'm having the same issues with my setup can you share pics of your c41s board and you mach3 settings please