For a solvent, I've used the automotive spray brake cleaner. It's alcohol
based, with some other stuff in it. And one of those 'scotch brite' like
scrubs can help remove and stubborn material without doing to much damage to
the surface.
The little lacy interface thingy is supposed to better than half hard metal and
stainless too. Springy, with a capital S. Another cheep substitute and/or
manufacturing fail.
For your one time solution, take the card bracket, the "L" shaped one that gets
fitted in, off the card, or at least loosen the screws. Then with your fingers,
in a fashion that spreads the pressure across the surface of the bracket,
GENTLY bow the center outwards a small amount. When re-assembled and fitted
back in, that bow will work as a spring, sealing to a larger degree, that gaps
that were open. Be sure the bottom tab catches in the little socket meant for
it.
You can also find the lacy things online from those stores that supply parts to
build computers. But I suspect the quality is dead soft metal, not the spring
originally specified.
Once we specified beryllium copper spring fingers. The price per inch was
something like $0.35 but manufacturing fournd a source at $0.07 per inch. That
was in the first build, which got EMC tested. Fail! I think copper tape had
more spring than those fingers did.
Big re-work.
Attitude is Mind over Matter.
If you don't Mind, it doesn't Matter...
This email has been displayed using 100% recycled electrons and 100% pure
virgin photons.
--- On Tue, 2/15/11, McInturff, Gary <gary.mcintu...@esterline.com> wrote:
From: McInturff, Gary <gary.mcintu...@esterline.com>
Subject: Cleaning of EMC mating surfaces - suggestions
To: "EMC-PSTC@LISTSERV.IEEE.ORG" <EMC-PSTC@LISTSERV.IEEE.ORG>
Date: Tuesday, February 15, 2011, 10:47 AM
I need to clean some metallic mating surfaces and since I have to use
this same equipment in the future, I don’t want to just lightly sand the
surfaces if I can help it. I suppose like gold contact I might be able to use
the old eraser trick but I would like to chemically clean the surfaces to
remove any coating contamination or oxidation without taking off the coating or
the underlying metal plating – any body got a favorite cleaner?
I have a support PC made by one of the biggie manufacturers that I
desperately need to meet class B emissions because it is the only one I have to
drive the test item. Unfortunately it has what I’m sure the Mechanical Engineer
thinks is a robust solution for the I/O panel for user added cards. From a
brand new one time user perspective it is pretty slick, no tools need, just
snap a couple of plastic fulcrums to different position to remove or add a
card. The card face mates into a very delicate little lace interface of punched
tin plated “?” gasket that conforms at several points along the I/O card face
panel and the inside of the computer housing. The fit happens exactly once as
far as I can tell. It mostly crushes and distorts and just leaves a cap running
between the I/O card faceplate and the computer chassis.
I’ll give them style points – but I’m going to whack somebody over the
head for the execution.
(I think I hear a whaaaa-mbulance in the distance)
Gary McInturff
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