Re: linear bearing based on ground flat stock

Graham

Cast the vee rollers I just described instead.<G>

The advantage of the vee wheels on square over rollers on flat is
the wiping action due to the larger diameter(s) of the vee wheel in
contact with the bar. This keeps "the bumps" at bay. You also get
increased rigidity and can use fewer bearings. Square bar is cheap.
Material choices are numerous.

Down side is the need to end mount the bar. But at your light loads
and relatively small travels this shouldn't be a deal-breaker.

You could even use delrin vee wheels on aluminum square extruded
tube. That would be light and quiet.

So far I can't think of a faster, more capable, or easier to make
solution.

Ballendo

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

>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, wanliker@ wrote:
> >
> >
> > In a message dated 5/22/2006 1:20:03 P.M. Mountain Daylight

Time,

> > eexgs@ writes:
> >
> > I would still need something for my cheap v-rollers to run on.
> >
> >
> > Round or Square stock will work, mount the square with one

corner

> vertical.
> > bill
> >
>
> I'm not sure what the advantage of a v-grooved bearing running on a
> square (at 45 degrees) or round rod is over two normal bearings
> running on the same. I guess its swings and round abouts, you only
> need 4 bearings but you need 4 sleeves.
>
> I have found yet another option, Igus do a range of bearings called
> Drylin W. It consists of a hardened (anodized at least) aluminium
> extrusion consisting of two round rods connected by a flat piece.
> They sell there polymer bearings to run on them but I have never

been

> all that impressed with how freely they run (given I have limited
> grunt and want max speed) so I'm thinking of buying the extrusion

as a

> quick way to get two parallel rods that are supported and mountable
> and then just make some carriages, each with 6/8 bearings. If I

could

> cast the carriages from a fibre reinforced plastic I would be

laughing.

>
> Graham
>