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September 2004

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From:
"Whittaker, Dewey (AZ75)" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Whittaker, Dewey (AZ75)
Date:
Thu, 16 Sep 2004 08:42:17 -0700
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In a former life(last week), I would have responded to the question of what
are the younger people going to do when the older knowledgeable people are
gone( passed on to that big TechNet in the sky, which we are just dying to
get in to) by saying it would probably lead to a lot of "spirited" debates.
In reality these days of 6 Sigma, Black belts, cross-functional teaming and
integrated supply chain mentality, it is no longer a requirement to have
technically competent people, because it is not important to have the
intuitive right answer. It is only important that everyone has agreed to the
same answer. The right answer may not be cost-effective or would require too
much technical support or understanding and that's not a path they want to
go down. If after 6 months the problem still exists, the Corporate mind-set
of Globalization and strategic initiatives will deem the problem and it's
associated activities as not one of it's core competencies and pursue
off-loading or outsourcing it.
Adolph Huxley was right.
Dewey

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Mike Fenner
Sent: Wednesday, September 15, 2004 6:39 AM
To: [log in to unmask]
Subject: Re: [TN] (2)PWB Conductive Contamination Under Solder Mask;
What Can ...


Same as us: The young folks will be surprised to find they are now the old
folks and wishing they'd paid more attention ☺ 

Regards 

Mike 


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of - Bogert
Sent: Wednesday, September 15, 2004 10:39 AM
To: [log in to unmask]
Subject: Re: [TN] (2)PWB Conductive Contamination Under Solder Mask; What
Can ...


September 15, 2004

Thanks for the information and history lesson.  What happens in the world
when all of us old folks are no longer here?

PS can you give me details on your book and where to purchase it?  Thanks
  ----- Original Message ----- 
  From: Brian Ellis<mailto:[log in to unmask]> 
  To: [log in to unmask]<mailto:[log in to unmask]> 
  Sent: Tuesday, September 14, 2004 1:55 AM
  Subject: Re: [TN] (2)PWB Conductive Contamination Under Solder Mask; What
Can ...


  You must be aware that using abrasive brushing (Scotchbrite (R) or
  slurry) is a major cause of solder dewetting. Micro-particles of
  abrasive get implanted in the metal, which is even swaged over some of
  them. I have PROVED this time and time again. I published this in a
  paper 'New Aspects on the Solderability of Printed Circuits' in the
  Technical Proceedings of Inter/Nepcon '69, in Brighton, as well as in my
  book (pp. 76 ff). It is amazing that a problem that was identified 35
  years ago is still largely ignored! :-(

  Brian

  Susan Mansilla wrote:
  > Hi Mike and All
  > I am familiar with the abrasive wheel cleaning processes. but those are
done
  > AFTER the tin/lead has been stripped.  The response I got indicated that
the
  > abrasive was used on the Tin/Lead deposit, which didn't follow my idea
of a
  > possible process flow.
  > Some PCB fab shops continue to use a "Scotch Brite" style of
  > abrasive wheel or brush as a final surface prep operation prior to
  > soldermask application.
  > Susan Mansilla
  > Robisan Lab
  >
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