Vertex Rotary Table Backlash

I have converted my 6" Vertex rotary table to CNC. What is the best
way to minimize backlash? What is the typical amount of the backlash
on these tables? Also, has anyone used some sort of indexing (rotary
table) to mount several vises on and index the vises to do several
parts with the current tool instead of several tool changes for just
one part then start all over again?

Thanks

Scott