Rotating Ballnut - design ideas

[Jonathan]

2) Optional
3) Note that on the drawing I posted the motor mount is 88mm wide, not 90mm which is the height of the main block. I intentionally left a 1mm gap so that when the block is bolted to a flat surface, you wont end up with the assembly partially resting on the motor mount (if the motor mount isn't attached accurately). The gap is on both sides since I put mounting holes on both sides of one block so they can be mirrored.
4) Very carefully. You use a 4-jaw chuck and a dial indicator.
7) Same, that's fine.
10) Or CNC4you if you want a cheaper option.

Minor point - on your drawing the 6 tapped holes that fasten the ballnut to the mount go all the way through the flange on the shaft. I made them blind holes so if you accidently try to use too long a bolt, the bolt doesn't go all the way through and damage the bearing.