Re: resin casting

On Fri, 31 Oct 2008 09:49:24 -0700 (PDT), Rob Kleinschmidt
<Rkleinsch1216128@xxxxxxx>
wrote in <af301e78-6070-4c50-ab9a-a358a41fc4e1@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>:
On Oct 31, 3:50 am, zoot <aba...@xxxxxxxxxxxxx> wrote:
On Oct 29, 2:18 pm, Rob Kleinschmidt <Rkleinsch1216...@xxxxxxx> wrote:

Anybody ever done any work with plastic resin casting ?

I'm looking to replace a destroyed 3-pole male JPT connector
which is apparantly always a one-off run for individual mfrs and
never available as a standard part.

I took one quick hack at a casting using a female housing
as a mold with a plastic repair epoxy kit mixed with a little bit
of liquid insulation paint as the casting material. I got a part
that could probably be made to work in a pinch but which
had some problems with bubbles.

Having done the one quick trial, I want to take a second shot
and try for a better part.  The finished part should be reasonably
strong, non-conductive and resistant to standard automotive
sprays and cleaners. Seems like probably a hobbyist or
electronics resin would be the best shot.

Any suggestions much appreciated.

bubbles?? did you pressurize?

No. Pressurize ?

Probably meant vacuum, as in vacuum impregnation. You draw a
vacuum over the casting while it's still liquid, so that any pockets of
air or bubbles expand and rise to the top. Then release the vacuum so
that any air-pocket still left contract, drawing potting mixture into
the crevice. I don't know how good a vacuum is needed -- not 10^-8
torr, I'm sure. Probably a few tens of torr would be sufficient; that'd
decrease any air-pocket to ~1/20th its original volumeas long as the
bubble detached from the workpiece. The info is probably on the interweb-
thingy somewhere.

--
Ivan Reid, School of Engineering & Design, _____________ CMS Collaboration,
Brunel University. Ivan.Reid@[brunel.ac.uk|cern.ch] Room 40-1-B12, CERN
GSX600F, RG250WD "You Porsche. Me pass!" DoD #484 JKLO#003, 005
WP7# 3000 LC Unit #2368 (tinlc) UKMC#00009 BOTAFOT#16 UKRMMA#7 (Hon)
KotPT -- "for stupidity above and beyond the call of duty".
.

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