On 17 November 2010 15:18, Jon Elson <[email protected]> wrote:

>  The only tricky part
> might be making it easy to connect or disconnect the ballnut from the
> apron, as it might end up on the back or inside
> the apron.  But, maybe just setting it up with the ballnut to the side
> of the apron would make that simple.

My mill has a way to disconnect the leadscrew when you want to use the
power feed motor for a rotary instead. The leadscrew nut is free to
rotate between bearings, with a plunger to lock it.

I think that a ballnut held in such an arrangement would spin freely
due to their high reverse-efficiency (I could reverse-drive my
mill/lathe combo Z feed with the motor and drive attached until I took
the rack off)

-- 
atp

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