Re: Modifying an X-Y table - ACME - for fun and learning

It appeared that some of the suggestions were to slot the "nut"
crosswise to the leadscrew and drill or drill and tap a hole parallel
to the lead screw for a compression bolt or a setscrew. The result
would be to compress or expand the threads slightly, in length,
altering the pitch enough to remove slack but not enough to cause
bind. Success will be determined by the accuracy of the leadscrew
thread.

Should be simplier and as effective as a double nut configuration.

If this is mildly successful, I just stumbled onto a pile of hospital
beds in a scrap heap. They have one ball screw and two acme rods per
bed. Must be close to a dozen beds altogether. No other details at
this time.
Randy

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "turbulatordude"
<davemucha@j...> wrote:

>
> > >In my opinion, this is a neat start to a fun project.
> > >
> >
> > Finally, someone else who views it the same way I do! Yes, I

could

> have
> > just bought a better quality unit, but where's the fun in

that?! ;-

>
>
> This seems like a great CNC 101 project. there is little to lose

and

> lots to gain !
>
> I think I will revisit my HF special that got pushed aside when I
> bought my larger X/Y table.
>
> for starters, the leadscrew would need to be checked for

straightness.

>
> IF it were really straight, then I would use that for the first
> attempt.
>
> Since ACME is not a taper, jsut squeezing the nut does not
> automatically mean a tighter fit... ergo some backlash
> compensation. I think I will look at adding a nut for a tandem nut
> unit so that the origional will be used with the addition of some
> sort of backlash compensation.......
>
> Dave