Re: ACME or Ball?

All:

I'll answer the patent number question myself:

Title: Reinforced lead screw with springless anti-backlash nut
Patent Number: 6,422,101
Date: July 23, 2002

-Wayne

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Wayne C. Gramlich"
<Yahoo@G...> wrote:

> Ballendo:
>
> Your message below begs the question, "just what is the Kerk
> technique for anti-backlash?" Does anybody have the patent
> number for the Kerk patent? Sometimes the patent drawings
> can be most instructive.
>
> Thanks for any information you care to shed on this topic.
>
> -Wayne
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "ballendo" <ballendo@y...>

wrote:

> > Jan,List,
> >
> > BS&A used to call those the "active cam" type. Basically the active
> > cam is their "work around" of the Kerk patent... (and it's okay, but
> > not nearly as good as the kerk, IMO.)
> >
> > The other thing to be careful of with these nuts is the very
> > low load rating in most sizes; far less than what one would
> > expect...
> >
> > Finally, there's no reason why a home hobbyist could not duplicate
> > the kerk technique for antibacklash... (Just can't sell it)
> >
> > Hope this helps,
> >
> > Ballendo