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Date: | Wed, 6 Jun 2007 12:18:04 -0400 |
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The Maytag man is very expensive here on earth. It cost me
almost as a new machine to replace three boards that burned on a three
year old washer. I told the repair man no can do. It ended up on the
curve. By the way, that repair man was very busy, unlike the commercial.
Ramon
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of John Burke
Sent: Wednesday, May 30, 2007 12:08 AM
To: [log in to unmask]
Subject: Re: [TN] Exposed copper (space applications)
Gary I am sure someone on the forum will reply but I just wanted to
comment on those PhD's............
Scared? Might be more like cautious - they perhaps know what it would
cost to get the Maytag repair man to do a site visit in deep
space...................
John
John Burke
(408) 515 4992
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Gary Bremer
Sent: Tuesday, May 29, 2007 8:29 PM
To: [log in to unmask]
Subject: [TN] Exposed copper (space applications)
Where is it stated that the conductive pattern can not have any exposed
copper on the vertical surfaces? Is that any empirical data that
supports a
failure mode if there is exposed copper on the vertical surfaces of a
conductive pattern? I have searched MIL-STD-2000, NASA-STD-8739-2 and
NASA-STD-8739-3 but can only find that it is allowed. Where I work those
with PhD's worry about exposed copper on the vertical edges of the
conductive patterns and are scared to allow to move forward because of
possible failure modes with a deep space launch. For my limited
knowledge of
metallurgy: after copper is exposed to moisture and oxygen, corrosion
takes place only on the surface and does not migrate any further. I do
have access
to NHB5300 to see if exposed copper was not allowed.
Gary Bremer
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