Re: aluminum Vee rails ?

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]
>