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Hi Leaddog,
http://www.thermadyne.com/prodspot/63_2104.pdf
This link shows an accessory kit (on page 4) that came with our machine like I was talking about, it comes with circle guides, wheel attachments and all sorts of gadgets to go with your torch to help you follow a line and make nice clean, crisp cuts.
One word of caution that wasn't so obvious to one of our employees apparently, the circle guide is a magnet that holds the center of your radius, well if you cut the entire circle out, the magnet is holding onto the part that is being cut out and it will fall through the bottom along with the scrap piece. He was using it to cut out 1'-4 diameter beam web penetrations and wasn't thinking through about what was going to happen when he completed his cut. It didn't hurt anything, but the potential was there.
John Wright