I had a small plasma cutter but fell out of love with it because it was rated a cutting about 6mm. If you were cutting 3mm or 4mm it was fine and the cut was equal in neatness to a laser cut, at 6mm the cut would walk at all sorts of angles and really struggled. I got rid of it and later bought the cebora prof 55 and chucked it under the bench, gas was what we had always used for cutting and the plasma was forgotten about. B.O.C had big problems supplying gas for about a year so I dragged out the plasma, what a machine, its rated at 20mm but is happy at 18mm max. After that it starts to struggle in the same way as the small one did. So my advice is if you want a plasma to cut 6mm steel get one with a 10mm capacity and leave some capacity untapped. They wont cut with ease the advertised thickness neatly.
Bob
Mule is fine Bruce I better hurry up and finish with it now the beemer lump has found its way out of the donor