Re: [CAD_CAM_EDM_DRO] Re: Alum. Extrusion Manufacturers

hey Dale,
Well, that's what one needs really...... Any readily available Aluminum
Extrusion that would work. Sometimes you see extrusions used for an
application but good luck getting some in its raw form !

(like you mention, "locate" who made it !)

I think the advantage to the 80/20 type stuff is simply in the available "T"
slot aspect. You sure can hang stuff on it easily. That's what makes it a
shoe in for linear applications. There are more and more companies who make
it, now to find the right one who was thinking ahead of the others.

Thanks,

Chris L


aspaguy wrote:

> Chris,
> My family used to have a company manufacturing camper shells, we used
> a part called a stanchion to support luggage rails on top of the
> shell. It was shaped like an upsidedown T with a circle on top. It
> was made from a long extrusion and cut into about 1-1/4" lengths.
> These stanchions are also used on custom vans for ladders and luggage
> rails and also for marine applications, to support hand rails on
> boats. If longer sections were needed, Im sure that if you could
> locate one of the stanchion mfgs they could sell you some of the raw
> extrusion before it was cut to length.
> Happy Hunting
> Dale
>
>
> --- In CAD_CAM_EDM_DRO@y..., Chris L <datac@l...> wrote:
> > When it comes to Linear Motion application, "affordable" linear
> motion
> > methods specifically (related to CNC of course), I have searched
> over
> > the past year for just *one* Aluminum Extrusion company who has been
> > "innovative" enough to make the Center Hole or Cavity (sometimes
> more
> > than one cavity) of an extrusion, to allow an *easy* insert of one
> of
> > the common Linear Bearing sizes.
> >
> > My goal was this. As many know, typical Round Linear Rail is quite
> > affordable. Sellers on E-bay practically give it away if you know
> who to
> > contact. But to afford Linear bearings premounted "IN" linear
> mounting
> > blocks raises the costs involved quite a bit. If you've priced
> Thomson
> > Rail Stands you've likely noticed they are pretty pricey as well.
> >
> > So, For a short travel distance "starter" machine, I hoped to find
> a
> > method where you would use real common Aluminum Extrusion sections
> > (short pieces), and press in a Linear Ball or Frelon Lined bearing
> into
> > it. This would allow one to buy just the "inner" portion of the
> bearing
> > and not the aluminum mounting blocks. Frelon gets pretty affordable.
> >
> > The beauty of the concept is that you would ALSO use the very same
> > extrusion as the stands for the rail (one each end), by turning some
> > simple "liners" that again would press into the Cavity of the
> extrusion.
> > The rail could be held in place with a setscrew or two. A 1/4"
> spacer or
> > even machinery feet would go under those end supports to allow
> necessary
> > clearance for the "Slide" sections. And, It would Look good !
> >
> > In the case where one prefers the linear rail to be secured all
> along
> > the length, you could even make your own "open" bearings as I have
> seen
> > some extrusions that offer some real good wall thickness. This to
> me,
> > seems like a really good "economy" - "hobby" - "newbie" method to
> make
> > inexpensive, yet pretty accurate slides.
> >
> >
> > Well, I have looked at using Fractional Extrusion with Fractional
> and
> > Metric Bearings as well as the other way around. Nothing lines up
> worth
> > diddly. I even checked out the dimensions of the extrusions used for
> > that new Air Line concept. Nothing lines up very well. Too bad.
> >
> > I am sure there are those "one off" extrusions out there that would
> fill
> > this interesting situation, and I am really sure if you had the
> bucks
> > you could have it made. But then, it probably won't be that really
> > affordable solution we all look for.
> >
> > If you happen to have a chunk of extrusion with a hole bigger than
> 3/4"
> > in it, and a piece of 3/4" linear rail Laying around, Slide that
> > extrusion over the top of that rail. Now imagine it had ball slides
> > holding it centered........ Now picture some of that extrusion on
> each
> > end of the rail in the same orientation with the rail firmly
> attached in
> > the center of it. "Instant" Linear Rails !! Without Thomson
> Pricing !
> > Joe Blow, could make this work just with a lathe by his side !
> >
> >
> > Not a bad Idea, I think !!!
> >
> > To me, I would say every extrusion maker is "missing the
> boat" in
> > this regard. If you know of one of the common rail companies that
> offers
> > a possible solution, please let me know. I've been swimming in DXF
> > files and Catalogs without luck.
> >
> > Thanks,
> >
> > Chris L
>
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