Hi,
I use Mach4 an have doe for six years, it works a treat.
I have a mill, so plasma is not my forte.
Recently Mach4 has added a script based THC feature. Given that it runs as a script its bandwidth is low, adequate in most circumstances but lacks the high bandwidth of a dedicated
hardware THC controller. There are a number of THC controllers but they have to be supported by and interact with the motion controller.
At the current time the Ethernet SmoothStepper (by Warp9TD) supports the use of a TMC3 (Texas Micro Control) THC controller and Mach4. Reports are that they are not easy to set up
unless you have previous experience, but work well once you do. Again, I have been told that the anti-dive strategies employed by the TMC3 work well and compare favorably to
very much higher priced industrial systems like Hypertherm.
Craig