Quote Originally Posted by luke11cnc View Post
I now know where I went wrong Jonathan my drawings where based on 20mm material and the material is actually 19.050075 however we do have slotted holes so that should be ok
That would explain it yes. The only thing that worries me is these errors/tolerances all add up and could ultimately cause the remaining 1mm clearance you will have in the slot, if I make the ballnut mounts 30mm, to disappear. Still it's probably negligible...