Rotating Ballnut - design ideas

[Jonathan]

I have at last started making the rotating ballnut assembly. I've started with one stepper motor mount, it's 100x245mm:





The reason for having such a long cutout for the motor is to allow me to use any reasonable size pulleys without changing the belt, which will obviously be difficult. I CNC milled all except the bearing bore which was bored on the lathe. I had to remove the gap bed on the lathe to do it - the join was painted over so it looks like this might be the first time it was removed! The six holes closest to the bearing will be used to push a ring against the outer ring of the bearing to preload it. The 4 bigger holes are for posts which link this to the other bearing mount.

I'll make some more bits when I've found my caliper :whistling: