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I think it needs to be approved but there is a link that takes you through to the comments on their forum.
 

As Tommy said, balls screws are a poor choice as you can't get the speed out of them and they whip.
Either belts or rack and pinion (with 3:1 to 5:1 reduction)
nodocs has changed. refer the docs

linuxcnc.org/docs/devel/html/code/buildi...nc.html#_build_modes