Re: : linear bearing based on ground flat stock

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Fred Smith" <imserv@...> wrote:

>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Graham Stabler" <eexgs@>
> wrote:
> >
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Fred Smith" <imserv@>
> wrote:
> >
> > > V-track rail systems use opposing rollers. There is a preload
> > > between the opposing rollers to prevent the roller from riding
> up on
> > > the sides of the rail angles. With a preload, there is little
> or no
> > > twisting of the trolley and it becomes very stable ( 4 total
> rollers
> > > and two parallel tracks). Connect two trolleys with a beam to
> > > create a gantry, or use one alone for a hexapod strut.
> > >
> > > Fred Smith
> >
> >
> > He was suggesting two rollers are enough.
> >
>
>
> Two won't work, but 3 will.
>
> Fred Smith - IMService
>

What can be done is to use a flat stock to get the needed shoulder for
the angled bar. then put 2 Vee rollers on the angled part and one (or
more) flat bearings on the flat stock.

If not, then you need to buy 2 lengths of the angled for each rail and
then, you need at least 3 rollers unless gravity is enough to hold the
machine down.

Dave