Re: [CAD_CAM_EDM_DRO] Re: re:Re: Lead screws for ever...(plastic)

Hurro..

> If you do, choose something besides teflon! In a constant compression
> use, it WILL "flow". Delrin would be a good choice. Or nothing, if

Yeah, someone else mentioned it does that, I might get more info on the ones
that Scott built so I can see how his are going. The last time I spoke to
him the assemblies had done about three weeks work with the teflon, and were
going fine, that was a few months ago now.

What I do all depends on what sized screws I end up with, I was going to use
Kerk leadscrews, but after tracking down a local dealer last week I find out
they are no cheaper than Ballscrews which surprised me somewhat.... I may
even resort to SS leadscrews and machine my own polyacetal or similar
material nuts with anti-backlash etc. That'd do fine for what I want.

Cheers, Chris.

----- Original Message -----
From: <ballendo@...>
To: <CAD_CAM_EDM_DRO@egroups.com>
Sent: Saturday, October 28, 2000 6:34 PM
Subject: [CAD_CAM_EDM_DRO] Re: re:Re: Lead screws for ever...(plastic)


> Chris wrote:
> >I imagine I'll do what Scott did and go with some type of plastic
> >packing washer in there, and just wind it up tight. As long as the
> >rating of the bearings isn't exceeded, and the load forces don't
> >compress the plastic any more during use<snip>
>
> If you do, choose something besides teflon! In a constant compression
> use, it WILL "flow". Delrin would be a good choice. Or nothing, if
> the bearings are correctly spec'd or the housing sized. In your
> drawing, this could be done with shims under the retaining plates.
>
> Hope this helps.
>
> Ballendo
>
>
>
>
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