Re: aluminum Vee rails ?

PBC Linear Make a good product called Integral V Rails.
http://www.pbclinear.com/Integral-V-Linear-Guide-Technology.

They have a spin off company which makes CNC Frames to order.
http://xyzgantry.com/xyzgantry/xyzgantry.aspx

You can order just parts, or short kits where you supply motors and electronics, or the whole machine.

I saw one of their machines running at the CNC Workshop in Ann Arbor last year.

John

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "turbulatordude" <dave_mucha@...> wrote:
>
> my understanding is that the BW bearings are twin angular contact bearings. that would make then well suited for the application.
>
> also, that some people are taking two skate bearings and making a simple version. not angular contact, but attempting to eliminate the play that a singular skate bearing would have.
>
>
> Using one single bearing with Vee will not be very satisfactory.
>
>
> my concern is the roller contact points on the aluminum holding up over time. a small router may not have too much pressure, but over thousands or tens of thousands of cycles, will the aluminum retain it's shape and distance between centers ?
>
> Dave
>
>
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, Roland Jollivet <Roland.Jollivet@> wrote:
> >
> > Using single deep groove bearings, as shown with makerslide, will be no
> > good. They are not designed to take a twisting load, as when you would have
> > a spindle hanging off this rail.
> > V groove rail bearings are usually dual, ie two bearings next to each
> > other. The V then sits between the bearings, making a triangular load
> > diagram.
> >
> > Here is an example;
> > http://www.google.co.za/imgres?imgurl=http://www.hb-bearings.com/1manufacture/pictures/pic%252022.jpg&imgrefurl=http://www.hb-bearings.com/1manufacture/products2.htm&h=200&w=300&sz=35&tbnid=Q3DVSG6fBHP91M:&tbnh=90&tbnw=135&prev=/search%3Fq%3Dv%2Bgroove%2Bbearing%26tbm%3Disch%26tbo%3Du&zoom=1&q=v+groove+bearing&docid=t8_FuOR5cMLnzM&sa=X&ei=k4m4T8WHDcTLhAfMgon-CA&ved=0CLABEPUBMAg&dur=2699
> >
> > Regards
> > Roland
> >
> >
> >
> > On 19 May 2012 23:16, Tony Smith <ajsmith1968@> wrote:
> >
> > > **
> > >
> > >
> > > > Yes, this is the idea.
> > > > Any experience of how much strength this has ?
> > > >
> > > > Also, it looks like a total patent violation of the Bishop Wisecarver
> > > stuff ?
> > > >
> > > > IIRC, there was a guy selling exact duplicates of the BW stuff a few
> > > years
> > > ago.
> > > > does not seem to be around anymore.
> > > >
> > > > Dave
> > >
> > > Since it's just the regular beam (4"x2") with the rails added, I'm guessing
> > > the strength would be the same. The www.makerslide.com site lists the
> > > numbers to calculate the strength. The www.buildlog.net site has this:
> > > http://www.buildlog.net/forum/viewtopic.php?f=30&t=1258&start=10
> > >
> > > Originally they were using the Bishop Wisecarver stuff, but decided gluing
> > > those to the beam or grinding flat plate was too hard, so making a custom
> > > part was easier (more fun anyway). Each to their own I guess.
> > >
> > > There's been no mention of patents, presumably it's "different enough" to
> > > avoid conflict or maybe BW haven't noticed yet.
> > >
> > > Tony
> > >
> > >
> > >
> >
> >
> > [Non-text portions of this message have been removed]
> >
>