CIR-O machines are lightweight, heavy-duty, multiple use circular drives. Each of the three sizes of machines has a positive rack and pinion drive and infinitely variable speed control which provides smooth, accurate travel in all positions. The carriage provides a mounting surface for a variety of different process tools. A single center punch mark is all that is needed to locate the machine on the workpiece. It is then ready to flame-cut, bevel or weld. Permanent magnets or vacuum cups can be purchased separately to hold it in place.