Re: CNC plasma torch interchangeabilty
You should be OK going form 40 to 60 but I would be hesitant to go from 40 to 80.
The reason being, the smaller machine may not have enough grunt to manage the larger consumables. Also be sure you can deliver sufficient air at the torch tip
Having said that I had an Everlast 50s (IPT60 from memory) once and I bought a machine torch from them and they supplied a larger 70 or 80 amp Traffimet torch which worked ok. When I compared notes with others, the cut voltage was about 10 volts lower.
Rod Webster
www.vehiclemods.net.au