Both the plasma cutter and an oxy-acetylene rig will cut 12 awg just
as fact as you can move the torch. The oxy-acetylene rig takes a
little more operator skill than the plasma cutter. The consumables
are easier to calculate for the oxy-acetylene just look at you gas
card for the tip size and pressure and it will give you the flow
rate. The plasma cutter costs will vary depending on how good you are
at babying the tip and whether you have a dryer on the air line.

starbolin