Look into buying true ball screw support bearings.
SKF, NSK and Fafnir sell them. They come preloaded already and "bolt in" off the shelf assuming you find a size that applies to your application.
You will NOT be disappointed by doing it this way..... Been there, done that, wasn't disappointed.....
Check out HIWIN as they have drawings for some Bridgeport ball screws on their website.... |