Re: linear bearing based on ground flat stock

Graham,

Your light loads and imperfect ground stock should meld well with
two sets of bearings used in threes. Kinda works with the overall
name/design as well<G>

I'd spring load a single bearing against the other two, with one set
of three on the bar "edge" and the other set on the bar face.

Plenty of support for the light loads with only three bearings IMO--
choose the direction of greatest load to select the 1 vs. 2 bearing
side.

Easy to build, as it will self-align; after which you can attach
whatever needs be accounting for its self-alignment(and variation of
that from the designed position)

Spring pressure could be fairly substantial and still allow free
movement along the ground bar.

Ballendo


--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Graham Stabler" <eexgs@...>
wrote:

>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Jack Hudler" <yahoo@>

wrote:

> >
> > Ok I just sused it. (Boot to the head)
> >
> > I don't see over constraint being an issue.
> >
> > You could rid yourself of the inside bearings and/or double up on
> the top
> > bearings.
> >
> > If you had some specs on the bearings and total load, I could

try to

> crunch the
> > numbers on it.
> >
> >
> > .---------------------------------------------------------
> > . ||

||

> > . | || ||

|

> > . V || ||

V

> > . +--------+ +--------

+

> > . --> | | <-- --> | | <--

> > . +--------+ +--------

+

> > . ^ ^
> > . | |
> >
>
> I need three rails, each independant, they don't need to work in
> pairs. No number crunching required, loads will be tiny I know it
> will work but given the likely variation in the bars dimentions

(the

> ground stock is not made to the standard of a parallel for

example) I

> was worried that too many bearings would lock it up.
>
> Graham
>