Re: rolled ball screws

Same here, ready to order but ho has the
best bang for the buck not nessesarily the
lowest price?

Still waiting to get a quote from some MFG's.
But probably will end up with McMaster or Roton.
Question did any of you that bought the McMaster
stuff use two ballscrews together to get a
backlash free adjustable nut?
Some other MFG's show Pics of there assembled
doublenut and there is a little adapter fitting
in between.

I plan on fabricating this adapterfitting myself
if I go with those screws.
Reading through the info it seams that some MFG's use
a spring kind of mechanism between the doublenuts
to provide a fixed amount of preload.
This may be one of those things that works well in
practise but looking at it from a theoretical point
of view this seams awfull, the second nut would merly
act as some sort of damper.
I was planing on making something that is adjustable but
when locked would keep a fixed distance between the nuts.
Is my thinking wrong here?
How did you end up with this on your machine?

Thanks for reading this.


--- In CAD_CAM_EDM_DRO@yahoogroups.com, "elmo14226 <elmo14226@y...>"
<elmo14226@y...> wrote:

> Steve,
>
> Did you ever get the ball screws from Roton? I am about to order
> some screws from McMaster-Carr, and I was wondering how you made

out

> with Roton.
>
> How do you specify how much preloading you want in the screws?
>
> Thanks,
>
> Bert
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "tsalaff <tacman@s...>"
> <tacman@s...> wrote:
> > Hi,
> >
> > I am in the process of building a small CNC mill and would like

to

> use
> > rolled, preloaded ball screws and nuts. The cost of these rolled
> > components is not much higher than Acme screws and nuts. The ball
> > screws are preloaded by placing larger balls than usual in the
> nuts to
> > take up any slack.
> >
> > Does anyone here have any experience with these types of
> components?
> > How well do they maintain zero-backlash over time? How long does

it

> > take to break them in? Reliability?
> >
> > Thanks
> >
> > Steve