Hi Earl! Hey, did you ever get an feedback on how the CCGA's performed in
their use environment (and what was the use environment conditions)? We
have successfully placed CCGA's in both the semi-automated and automated
assembly modes but if the columns are bent - even slightly - we have seen a
pretty hefty reduction in solder joint fatigue life (avionics use
environment). I have an IBM paper which showed similar results.

Dave Hillman
Rockwell Collins
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Earl Moon <[log in to unmask]>@ipc.org> on 05/31/2002 12:34:20 PM

Please respond to "TechNet E-Mail Forum." <[log in to unmask]>; Please respond
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Subject:    Re: [TN] NTC - The Gregory's are a team now...


Never experienced any problems with CCGA's either in production or
replacement. I did hundreds of these things with the SRT because of an
upgrade. It took almost six months for all the replacements at 24 per board
with 1200 columns. Only minor problem was with sorting out GSM placement
accuracy concerning the vision system.

Really had to watch column alignment though as you say. Other than that, no
problems. I guess, as I don't clearly remember, the force issue was
resolved
as a function of machine programming but the parts were so heavy anyway, I
don't think it mad a difference as they just sunk into the paste and
aligned
very well.

Interesting stuff, eh Gaby?

Earl

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