Nice job Mike. It also nice to meet you at APEX.
----- Original Message -----
From: TechNet <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Sent: Mon May 02 07:37:48 2011
Subject: Re: [TN] "The Curse of IPC-A-610 and IPC-J-STD-001" - opinion piece by James Smith
The article's premise -- that standards drive up costs -- is stunning in that it completely mischaracterizes a core reason standards exist: to ensure widespread uniformity to a predefined level of quality.
Indeed, as someone who has traveled extensively abroad (I have spent more nights in Shanghai than any city other than the ones I have actually lived in), I can unequivocally state that manufacturers in China, Taiwan, Malaysia and so forth use IPC-A-600 and IPC-A-610 almost exclusively. And the reason is, those are the standards that their Western customers demand. Southeast Asia might offer lower labor rates, but that has nothing to do with IPC-A-610. As they used to tell me in stats class, correlation isn't causation. I'm surprised Dr. Smith's grad school teachers didn't drill that conceit into him.
Having spent many a weekend in J-STD-001 meetings, I can state from experience that many defense contractors pushed to ease certain requirements in order both to save money and improve reliability. In one instance that springs to mind, Boeing provided ample evidence that minimum hole fill could be reduced because, they found, although a higher percentage of hole fill was seen as more reliable, in practice inspectors would have the rework technicians hit nonconforming holes with the solder gun, and the additional temperature excursion *reduced* long-term reliability more so than the greater volume of solder in the hole could increase it. These types of discussions don't show up in the final boxscore, but you can't understand the outcome of the game without knowing them.
This indirectly raises a separate point, however, namely: that it is critical for the US to maintain control of the standards. As my old friend Dieter Bergman used to tell me, he who controls the minutes controls the meeting. By authoring the standards (and making sure that the key Western OEMs are active contributors), the US can ensure a place at the international table far superior to the one our depleted manufacturing base would otherwise allow.
I think there's an editorial in here somewhere.
Best,
Mike
Mike Buetow
Circuits Assembly
w/m 617-327-4702
>>> The CIRCUITS ASSEMBLY EMS Directory -- over 2,100 listings, in Excel www.circuitsassembly.com/dems <<<
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-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Woolley, Mark D. (Mark)
Sent: Monday, May 02, 2011 10:13 AM
To: [log in to unmask]
Subject: Re: [TN] "The Curse of IPC-A-610 and IPC-J-STD-001" - opinion piece by James Smith
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7V7f"twithstanding, I believe - and I've proposed this idea before - that
there is a too slavish adherence to standards rather than to common
sense. This is because the standards exist and are used but are not
applicable to many applications which do not require top quality
reliability. Just the unnecessary inspection is costly, let alone the
afterwork. It reminds me of one of my ex-customers making a lab
instrument that is used only in comfortable room conditions. He was
getting a lot of cratering on his wired through-hole SJs after wave
soldering, and he had personnel reworking these joints (which
plop-plopped for several seconds of applying the soldering iron). I
asked why and he told me that the joints were faulty. I rejoined with
something like BS. He gave me a board full of craters but which was
otherwise faulty and I did microsections of half-a dozen "faulty" SJs,
all of which showed perfect intermetallic formation along both wire and
through-hole plating, with the craters and blowholes outside the
intermetallics. This persuaded my client that the "fault" was cosmetic
and he stopped the retouching except on grossly obvious faults. From
that moment, the number of returns was reduced. For pointing out to him
that he was wasting money by a too-solicitous inspection and retouching,
he presented me with a bottle of Neuchâtel Oeil de Perdrix, which was
delicious.
Incidentally, it was this case that inspired me to develop what became
known as the "Plop-plop Meter" to measure the outgassing of PTHs. This
never got beyond prototype stage, but it worked admirably and was able
to distinguish between different causes of outgassing. However, I wasn't
convinced that the market justified putting it into production; it
remained a curiosity.
In short, Standards, used appropriately, can help, as far as possible,
to perfect reliability for a given application. Used inappropriately,
they can drive up costs dramatically and with no justification; this
could drive the manufacture to E. Asia, at the cost of jobs. Maybe the
author was expressing this sentiment, albeit unscientifically and too
clumsily.
Let common sense prevail!
Brian
On 29/04/2011 19:15, Graham Collins wrote:
> Anyone else read this?
> http://www.assemblymag.com/Articles/Blog/BNP_GUID_9-5-2006_A_10000000000
> 001038283
>
> All I can say is "wow". Well, I could go on for hours, but... wow.
> Not quite how I see these specs! Working on military stuff I can attest
> that changing from MIL-STD-2000 to the IPC specs was a significant
> improvement in reality, reliability, and productivity, but that's not
> how he sees it.
>
> regards,
>
> Graham Collins
> Halifax Production Engineering
> L-3 communications Electronic Systems
> (902) 873-2000 ext. 6215
>
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