At this point the THC will check the raw volts and adjust the height and follow the metal surface. You did not say if you are using the pierce function or a delay before cutting. This will have a big effect on the raw volts at the tip. Another thing you need to run the plasma unit to the spects of the torch tip if you have a 40 amp tip run it at 40 if you have a 60 tip then run 60. Having this on caused my problems similar to what you are having. Next do you have THC option turn off in ports and pins. There are a few questions do you have the THC turned on in Mach3 this is on the front page of Mach 3 see picture. I don't mind a few challenges but it will be fun to do a few projects now. I hope that this thc problem will be the end of my challenges for a while. I am 59 and trying something new for a little hobby. This has been a fun learning project to purchase parts on ebay from all over the world, build and wire the machine. would this length cause that big voltage drop.(proma instructions said to keep this lead short) My lead from the pp50 it about 3 to 4 feet long in shielded cable. I was running at 30 amps and the reading on the thc readout was around 54v. I read that the raw arc voltage should be 88v at 20amps and about 100v at 50 amps I am using sheetcam with mach3 and bob is a tb6560 4 axis. I bought a proma thc and mounted it to the pp50 ,and it recorded around 54v ach voltage raw volts,so the low volts made the torch lift and stop cut. It worked well except that the torch tip would touch and drag and last only a very short time then mess up the project. I just finished a 4 foot by 4 foot cnc table.
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