For a router support on axis [axes?] is required..plasma or torch type table additional upward support isn't needed...
I'm about half way through building another plasma /oxy table, and I used cheap chinese bearings for side to side [4 brgs] and support on bottom [2 brg], with no regard for any upward pull...after all if the cutter pulls the arm up, then it's way too low on the table..
for any significant load, which is pretty well any 'contact' type of cutting, support in all directions is required..
Last table had linear bushings with acme thread and rudimentry zero backlash nuts, the one before had actual THK rails and 'store bought' ballscrews..
for the intended purpose of this one [flat steel cutting for brackets, braces, etc.) a final cut tolerance of +/_ 0.005 is more than enough...if it turns out that tight..
So far X/Y movement with 50 lbs pressure applied is around 3 thou..on the torch carriage..don't have the screws tied in as of yet...
maybe tomorrow...
enjoy..


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