Re: How do I 'make' a ballscrew antibacklash nut?

--- In CAD_CAM_EDM_DRO@y..., "dspinnett" <dspinnett@y...> wrote:

> Hi all, I'm kind of a CNC newbie.
>
> I've converted my Grizzly G1006 to CNC (Master5/Mach1 and

Camtronics

> 4 axis servo), but the backlash and lead accuracy stink.
>
> I understand I can get decent/cheap screws (.004/ft) from McMaster-
> Carr, and use a pair of taper or angular contact bearings for the
> drive end.
>
> What I don't quite get is, how do you make a 'anti-backlash' nut
> from two regular ball screw nuts? how do you connect them to the
> mills existing mount (two screws)... I've read about using a spring
> to pre-load, but I cant visualize how that works.
>
> Also, doesn't anybody sell a reasonably priced screw with .100/rev
> like a 'regular' mill screw?
>
> Any advice?
>
> Thanks,
>
> Dave S.

Some ballnuts has one end with outside fine treads on it, put both
ballnuts agaist each other and using the adjusting outside nut you
can put pressure on the two ballnuts forcing them to pull apart from
each other thus, preloading them.
sort of split acme nuts.
The springs, takes the adjusting nut place ,and it works ok only for
small loads.