Rotating Ballnut - design ideas

[Jonathan]

Have a look at my Harrison conversion thread for pics of how I done it -http://www.mycncuk.com/forums/showth...ill-Conversion
Everything is big, but that's only because it needs a big screw. I should still have the solidworks files somewhere, which I'll have a look for shortly.

Nice design, if you could find the solidworks file that would be much appreciated. I had drawn something similar previously, but with two angular contact bearings. I've now redrawn it based on yours with a single 5207 bearing. It's going to cost about £32 for two of those bearings, so quite a lot more than the previous design. It also means the pulley has to be at least 60T (assuming XL pitch), which is getting a bit large if I need a bigger pulley on the stepper motor. I've drawn two versions with the pulleys mounted using different methods.



I'm not sure if where the force from the tension of the timing belt is ok?

The problem for me with the above design is making the thread / nut. It's not something I've had much luck with before. Unless I spend £20 on a die and can buy the nuts:

http://cgi.ebay.co.uk/35mm-35-x-1-5-...item1c1a2cb180