I have a 110v Hypertherm unit with a self contained compressor. It cuts sheetmetal fine. Anything much thicker and it takes a little bit of time. I've actually had the overload protection shut it off a couple of times while cutting out brackets (1/8" thick) and what-not. If the metal isn't 100% clean, it doesn't do very well either.
When I get my situation straight I'm going to upgrade to a 220v unit and use my Ingersol Rand compressor to supply the air.
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