Re: [CAD_CAM_EDM_DRO] SeriesII Quill Zaxis CNC addon ideas: Like Jon E's?

Marv,

The only downside of doing it with an acme screw is the wear. Carrying that
much weight and moving it all the time will likely yield an inconsistent
pitch in a relatively short time. Besides, on my machine it was already
equipped with the ground screws from the factory.

Tim
[Denver, CO]
Sherline products at Deep Discount (now Mach1 CNC controller too)
www.KTMarketing.com/Sherline

----- Original Message -----
> Tim
> If you size your motor properly, with the right gearing, is it
really
> necessary to convert the knee to ballscrew? It seems to me, with that much
> weight on the screw, the original acme screw would have virtually no
> backlash. Gravity would take care of it. If we could figure out how to put
> the same amount of tension on the x and y axes, we would probably never
have
> to concern ourselves with their backlash. Aren't we doing almost the same
> thing with pre-loaded nuts?
>
> Marv Frankel
> Los Angeles