Re: Easing Into CNC -- Ball Screws?

--- In CAD_CAM_EDM_DRO@y..., Deon Styger <deons@e...> wrote:

> 2) A split nut (most of the time the existing nut). The two split

halves are

> either "pulled apart" or "pushed toghether" with some sort of screw
> arrangement, taking up the backlash. Some mill / drills are sold

with such

> an arrangement already in place. I might be wrong, but I think the

RF 31 is

> supplied with it.

A word about the slit nut design on the RF and associated
mill/drills. Very bad design. The nut is slit about 1/4 of the way
from one end. Moving one direction, 3/4 of the thread area is being
used. Moving the other direction, only 1/4 of the thread area is
being used. Add in the fact that this section is "bent" towards the
rest of the nut by the adjustment screw. On a good day there is
probably 1/2 of one thread carrying all the load.

My point is that your anti-backlash nuts should be equally beefy in
both directions.

Tom S.