Re: [CAD_CAM_EDM_DRO] anti-back lash nuts

The main problem with modifying the nuts is that in return for reducing
backlash, the nut must fit tightly on the screw. On a new machine, such as
the Taig CNC mills which have anti-backlash nuts from the factory, this is
not as much of a problem, since the screws are in good shape. However, on
an older, used machine, the screw may be worn, possibly significantly. Most
of this wear will be in the center of the travel. If you tighten the nuts
in the center, they will bind dangerously near the ends of the travel, where
the wear is less. If you tighten at the ends, then it will still be loose
in the center. IMO, the effort and expense of replacing the screws with new
ones and modifying the nuts is not significantly less than acquiring and
retrofitting anti-backlash ballscrews.

On Nov 7, 2007 12:58 AM, zs6bxi <bobt@...> wrote:

> Apart from alot of lurking, I think that is the first time that i have
> posted to the group. I have an elderly Boxford lathe that I am moving
> towards using CAD-CAM on (mainly for taper turning screw cutting etc.)I
> have pulled the cross slide feed screw and nut out and am looking to
> see what can be done to improve the back lash. (its not bad for its age
> and being a lathe as well)I have seen several references to slitting of
> nuts, adding of extra nuts and spring pressure and using other sections
> of treaded rod as a nut. But what I would like to know and get advice
> on before I start slitting my expensive to replace nuts is, how
> sucessful have these methods been ?
>
> Regards Bob
>
>
>


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