Re: [CAD_CAM_EDM_DRO] extrusions and "potting"

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@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
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