Hi Dan , What I was relating to is IF there was a way to feed pulses from teh VFD into teh index signal input of UCCNC then you would have a direct readout of the atcual rpm and NOT have to use a special DRO to display it. That way you would NOT have to monkey with a screenset (;-)
It could also be used to create a Cruise control so that IF teh RPM dropped below a certain % of Set RPM then UCcnc could lower the feedrate to allow the spindle to catchup or at least to maintain. Once teh RPM catches up then go back to 100% FRO.
I had done this long ago with Mach3 and it worked very well for a router.
Just a thought, (;-) TP