Sorry, lets start again. I know all about threading single point on the the lathe like using g76 etc and not having to turn led's on and off, don't know what Rufi is on about, that's the problem with trying to marry two systems together, it's a pain. This is what his manual says:
Mach3 Threading Bug Workaround:
DSPMC plugin uses LED 1370 to workaround threading logic problem with mach3.
In your G-Code program, turn on LED 1370 right before the threading g-code command and turn it off after the threading cycle is done. This will cause the programmed RPM +20% to be sent to Mach3 instead of true RPM during the threading cycle. This makes sure mach3 will generate correct feedrate for Z axis. Once this LED is off, true RPM will be shown on mach3 spindle rpm DRO.
Also he telsl me I can't run 2 hanwheels at the same time and to wait for Mach4 to out, don't if that's the capability of DSPMC or Mach?
ray.