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September 2004

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Subject:
From:
Brian Ellis <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Brian Ellis <[log in to unmask]>
Date:
Wed, 22 Sep 2004 09:50:22 +0300
Content-Type:
text/plain
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text/plain (133 lines)
Unfortunately, Mountain Dewey may have a slightly cynical way of
expressing it, but he is 1000% right, in essence. Commonsense no longer
prevails. How many time have you seen messages here like "Is there an
IPC standard on how I should hold my willy while urinating?" or "Is a
mil the same as a mile and a millimetre" or "I'm wave soldering, which
flux should I use?" or "Is a short circuit between two tracks a no-no?"

However, he was wrong in one respect, it was Aldous Huxley who predicted
psychological conditioning in technological spheres when he wrote Brave
New World, the same year as when I was born (no connection). Adolph H.
wrote Mein Kampf.

Brian

Ahne Oosterhof wrote:

> Ouch, empty a whole bottle of Mountain Dew, and pry that tongue out of the
> cheek.
> Ahne.
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Whittaker, Dewey (AZ75)
> Sent: Thursday, September 16, 2004 8:42
> To: [log in to unmask]
> Subject: Re: [TN] (2)PWB Conductive Contamination Under Solder Mask; What
> Can ...
>
> 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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