Re: spinning ball nuts

One area where spinning ball nuts come into their own is on a CNC
lathe.
If you mount the ball scew so it's fixed and have the nut on the
carriage supported between two angular contact bearing to take cae of
thrust and load you can then drive this via a toothed belt drive onto
the buu block.

Nothing new with this, many designs do this but a spin off is if you
also fit a bevel gear to the nut block you can then drive this with
another bevel mounted on a disengageable handwheel. This way you can
get to use a CNC lathe in manual mode without having to rely on
standing at one end turning the ball screw.

John S.