Can somebody explain the basics of using a plasma cutter. I had a quick go, operated the torch air came out. But what next, do i touch the work with the torch or not. Is the air heated at the tip of the torch, and why does the tip not burn away with the ark. I know the tip is called a castle one cos its got grooves in. If i touch the tip on the work it arks, is this ok. Can you tell i haven't used one before. I' thinking of adding a small one to my workshop.