I have Torchmate 4510 with a Flexcut 80 and was able to cut a sheet of 3/4" mild steel with the following settings. Thought I would share the results in hopes it will help someone else and maybe get some feedback. Could be better and I will work on it as I can. There was a fair amount of slag, but knocked off easy without a grinder. TH .25 PH .25 CH .195 ( I think this could be lower and plan on testing later) PD 3.5 RH.25 Arc Voltage 139.00 Feedrate 16 Water level 1.25" below bottom of plate