Re: Screw Drive

Hi I found one of these at a local surplus store. Mine had a very
fine thread arround 20 tpi and rather than balls the nut had eight
pieces of threaded rod again 20 tpi. The rods were mounted in a
cage that allowed the rods to recirculate as the nut was rotated.
It would make a great lead screw for the knee on a mill but its all
a bit big being inch and a half in diameter with the nut beaing
nearly 3 inches. Interesting concept.
Fred

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Lee Studley"
<indigo_red@q...> wrote:

>
> Hi Jan,
> There was a discussion about it whaile back that I missed. In one

of

> the machining magazines there was an article desribing it.
>
> It's sounds like it is a anti-backlash scheme using pieces of the

same

> threaded rod 120 degrees apart surrounding the outside of the

screw

> to act as a nut. My guess so far without researching. There's

a .jpg

> picture in either files or photos sections.
>
> -Lee
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, JanRwl@A... wrote:
> > In a message dated 11/29/2004 2:26:47 PM Central Standard Time,
> > indigo_red@q... writes:
> >
> > screw drive as ballscrew alternative?<<
> > How is a "screw drive" an alternative to a "ballscrew"???
> >
> > Jan R.
> >
> >
> > [Non-text portions of this message have been removed]