Rotating Ballnut - design ideas

[Jonathan]

I've now made all 4 bearing/stepper mounts and one shaft. I will machine the pulley (30 tooth) directly on to the shaft.

When I machined the shaft on the lathe I got only small pieces of swarf, not the long stringy stuff you normally get - see picture below of drilling it for what I mean. It was almost like cast aluminium...but it's not. Must be a strange grade?

Lots of photos, hopefully pretty self explanatory:



















It got 0.01mm bigger after drilling...so now 34.99mm which fits the bearing nicely:







(Hopefully nobody without broadband is trying to view this!)