Re: [CAD_CAM_EDM_DRO] Re: extrusions and "potting"

If I were to think about incorporating Bearings to Existing Extrusions my
First attempt would simply be for 3/4" Closed Bearing or the nearest Metric
Equivalent without going smaller. Then, if the extrusion has gapping holes
around the outside of the bearing hole, I would pour them full of something
and attempt to slice open a slot in order to make and Open Bearing Slide. The
biggest problem with this as I have noticed is that the current extrusions
sizes that would let a 3/4" rail slide thru with a real bearing get way to
big in the Overall dimensions for my liking. Options I guess would be thin
Frelon Liners instead of Ball Bushings.

Either way, this is supposed to be the cheap option that matches the use of
1/2-13 threaded farmyard rod we used to tie the old Baler together when it
was necessary. Thin Liners in extrusions would still beat the heck out of
Drawer Slides !

Mr. B... Did you check out the Paletti Site ?? They have interesting Shapes
..............

Chris L

ballendo wrote:

> Marcus,
>
> We're back to Moglice?
>
> Moglice is DESIGNED to be "cast in place", and is also designed for
> linear motion applications(machine ways), which would seem to make it
> IDEAL for a "potting" type use with extrusions...
>
> In this case the machine would be entirely set up as Randy suggests,
> and then the moglice poured around shafts which have been sprayed
> with release compound. Although moglice is expensive, the lack of
> need for machine tools and the time saved might balance the equation.
>
> Hope this helps.
>
> Ballendo
>
> P.S. I might work up a design for this. What size would be "good" for
> those looking for this type of "easi-build" machine? Reply offlist if
> you like.
>
> --- In CAD_CAM_EDM_DRO@y..., "Marcus & Eva" <implmex@a...> wrote:
> > Hi All:
> > That was what I had in mind when I got into this thread.
> > If I recall correctly, the intent was to be able to cobble
> together a
> > workable motion control system without access to a machine shop,
> hence the
> > notion was raised that extrusions would be desirable if only the
> hole sizes
> > were.... etc, etc.
> > Smoke, I understand completely, your point that a superior part can
> be
> > produced more cheaply by casting and machining, but I am still
> considering
> > the case where there ain't nuthin' more than a rusty drill press
> and a
> > hacksaw to work with.
> > Within those constraints, do you think that stock bedding compound
> in an
> > oversize hole in an extrusion, say squirted in through an access
> hole while
> > the bearings are pre-assembled on a shaft will have the necessary
> > mechanical properties to do the job?
> > What's this stuff even like to work with. Can it be injected
> through a
> > syringe?
> > Will it stick to aluminum?
> > What kind of mold release do you need so it doesn't stick to the
> shaft too.
> > I'm thinking, as Randy suggests, that a useable system could be put
> together
> > with almost NO tools if the material is handleable in the way I
> suggest, and
> > if it has the mechanical properties to do the job.
> > You could build some pretty decent stuff using this "potting"
> technique with
> > weldments and extrusions, and no need for precision machining, but
> only if
> > the stuff doesn't crumble and fall out over time.
> > Cheers
> >
> > Marcus
> >
> > ----- Original Message -----
> > From: "Randy Gordon-Gilmore" <zephyrus@r...>
> > To: <CAD_CAM_EDM_DRO@y...>
> > Sent: Sunday, February 17, 2002 10:03 AM
> > Subject: Re: [CAD_CAM_EDM_DRO] extrusion of Linear Bearing pillow
> block
> > question...
> >
> >
> > > At 10:20 AM 2/17/02 -0700, Smoke wrote:
> > The best thing, in the
> > > slightly-oversized-hole-with-Loctite case, would be to assemble
> the whole
> > > carriage/knee/whatever assembly and then Loctite all the bearings
> at once,
> > > so they at least have half a chance of seeking a common alignment
> to the
> > > shafts they're to run on.
> > >
> > > Best regards,
> > >
> > > Randy
>
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