Hi,
as Wallerwang has posted the THC controllers sample the arc voltage and present an Up/Down signal to the motion controller.
It is possible tho do this with the mach4 script based THC or with an external THC?
Mach4 cannot read an analogue voltage, you must have some other device to do that. For instance the PoKeys 57CNC has several
analogue input channels. Therefore if you had a suitable voltage divider and signal conditioning circuit the PoKeys could sample the
voltage and the numeric value would be communicated to Mach whereon it could do its script based THC thing.
Alternatively you could use a THC module like a TMC or a Proma and that would sample the arc voltage, with or without a voltage divider,
and compare that to the target voltage (that you program into the module) which would produce an Up/Down signal which Mach
could then operate on.
The last alternative, and the best method is to use a TMC module in conjunction with an ESS or a Proma module in conjunction with a Hicon Integra.
These last two solutions are genuine realtime.
Craig