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Managed to get full speed control via my speed pot on my control box up to 400Hz.

I needed to alter another setting on the vfd. I also have start/stop control working via USBCNC now as well. All I need to do is manually select the Coolant flow icon on USBCNC first then the program will start and stop the VFD.:dance

If you wanted you could edit the code and put something like this in at the beginning..

M8
G4 P5000


(P5000 donates the dwell in milliseconds so here would be 5 second pause while your spindle spools up)

Then at the end just before M30 command insert M9 to turn off the coolant (in your case spindle that is if you have set your spindle up under the flood coolant and not the mist, if you have set the on/off under mist then just replace the M8 with a M7 )