I have a new home built cnc setup I would like to use as a plasma cutter. I'm wondering how I turn the torch on or off by computer control. I don't really see the need for a THC. I can control the height by moving the z axis but how does the machine know when to start moving the machine again after the torch starts, after a stop to skip over a section without cutting it. How do I stop the torch so I can skip over a section without cutting it? I have a Hypertherm Powermax 900 plasma torch. Wondering about wiring it up for computer control too. Its set up for hand use right now.