Rack and pinion drive is the most common / popular for most plasma
tables. Plenty of sources out there for the components and plenty of
info on CNCZONE.

Yea, I spend more time over there than here. rack pinion is best but I'm
refitting an existing machine with a clever cable drive. Won't be a big
deal to replace pulleys with sprockets and cable with chain.
lots of machines have been built with roller cahin drive over there also.
But, no sign of mechanical design for chain size.

Karl