Allen,
Generally speaking, rack and pinions work very well on a plasma machine. My machine uses 2 racks and 2 motors on each X rail. One thing you might want to check is top speed of your machine in the X&Y directions. Depending on your torch amperage and nozzles, you may not be able to move that ballscrew fast enough to cut thinner materials. Your only saving grace at that point would be if your torch could use Hypertherm FineCut consumables, which don't require as much speed in thin materials.
-Brady |