Re: - threaded rod leadscrews- now ROLLERscrew

A call to the factory revealed they cost 2-3 times that of a ball
screw.

Life is 50 times that of a ball screw.

Seems if you need one, the cost is not too high. If you just want
one, you need a pretty big wallet.

Dave


--- In CAD_CAM_EDM_DRO@yahoogroups.com, "m0nkey0ne" <m0nkey0ne@y...>
wrote:

>
> The Hercus bench top mill we used in school was fitted with roller
> screws on all three axis. At first glance, many, including the
> instructors thought the leads were merely threaded leads. It

wasn't

> until a retrofit of new steppers that the rods were actually 5
> pitches and the nuts had five rollers. It was an amazing and
> intriguing discovery for a couple college students. Even with the
> fine thread appearance, the tables could be pushed by hand, even

with

> the drives in place.
> Randy
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "spc_aux" <aux34@s...>

wrote:

> >
> >
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "turbulatordude"
> > <dave_mucha@y...> wrote:
> > >
> > >
> > > > Indeed, but take it one step further
> > > > and make your own threaded roller
> > > > screws. In one of the groups
> > > > (not sure I subscribe to about 45) there is a
> > > > suggestion on how to make these
> > > >
> > > > I include this link for inspiration; SKF also sells them
> > >
> > > http://www.exlar.com/products/linear/
> > > roller_screws/roller_screw_oview.html
> > > >
> > > > I have also draw up my own design
> > > > which I will build as soon as my Lathe is
> > > > finished being converted to CNC
> > > >
> > > > Stephan
> > > >
> > >
> > > I'm not familiar with this technology. Anybody use such a
> device ?
> > >
> > > I noticed the cost was not listed in the comparison chart.
> > >
> > > Dave
> >
> > That's pretty cool, I haven't seen those before.
> >
> > I think it's safe to say that the integrated servo units will be
> > serious $.
> >
> > It does appear that the design has some potential for home
> > experimentation. I suspect that it would require a lot of

toolpost

> > grinder use in order to get the tollerances that would be

required.

> > You would likely have to grind the thread in pre-hardened

material

> > since hardening after thread cutting would probably give too much
> > distortion.