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Wed, 28 Jun 2000 14:02:01 -0500 |
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As an IPC Certified Designer, I take offense to comments referring to the
"Lazy Designer". Perhaps you are forgetting that the Designer is not
responsible for contractual requirements, or perhaps the Lead Engineer has
stipulated certain requirements to be met. Perhaps the Designer was
responsible for the design of the board and not the documentation.
As a designer that has worked with both fabrication and assembly shops to
meet their needs, I take offense to your "Lazy Designer" stigma.
Perhaps when I call two assembly houses that have two sets of requirements,
and each is unwilling to change, I should call you "Lazy Assembly Houses".
Perhaps to those board shops that have modified my supplied artwork without
notification or approval, I should call you "Lazy Board Shops".
Perhaps you should ask the Designer (and not a Purchasing rep) why he made
such choices, and listen to the answer.
Perhaps you are too lazy to call!!!
Is that the type of response you expected Hans?
----------
From: Hinners Hans Civ WRALC/LYPME
[SMTP:[log in to unmask]]
Sent: Wednesday, June 28, 2000 2:40 PM
To: [log in to unmask]
Subject: Re: [TN] DOD Designs...
Hey Steve,
Amen to everything already said.
I'm gonna rant...
Okay . . .
I know the documentation paper trail can be daunting with DOD
assemblies,
but is correcting the design to specify current assembly standards
too much
to ask? It can only enhance the assembly reliability...
Daunting is right. I kill toner cartridges when I print hardcopies
of the
documentation we need. In addition to the people with engineering
responsibility over those parts, there are alot of non-technical
people
involved in supplying DOD with parts. Your initial customer is
probably a
nontechie. And as everybody knows, you can't make changes without
customer
approval. So the customer (or rather their engineering support)
need
testing done to demonstrate that it meets or exceeds the design's
intended
use and will survive in the "wild". If you ordered something out of
a
catalog you wouldn't want them to make a substitution without
asking?
We make suggestions to improve manufacturability and/or reliability
during
the bidding process. Sometimes they are accepted other times not.
If there
isn't money for design modification the customer might not be able
to make
the changes no matter what. You could write up a "Best Practices
for PCB
Assembly" (the hints of what makes your life easier) and provide
that to
customers.
The wall I hit is obsolescence. The design drawings and BOM may
look
complete until you actually try to build the little darlings.
Here's one I could use some help on. I'm looking for a connector
pin
(solder plated with a copper base) that looks like a thumb
tack/nail. It
was originally used/made by Applied Technology (A Division of Itek
Corporation). I checked with Amp and they don't make one like it.
Anybody
know of a custom connector manufacturer who does small batches -
750?
I am expecting replies from lazy designers that don't want to "buck
the
system"... I'm saying that to get some people to speak-up.....
Should I point out that lazy designers wouldn't reply or be on the
list?
This list is not for the lazy.
Later,
Hans
~~~~~~~~~~~~~~~~~~~
Hans M. Hinners
Materials (Process & Manufacturing) Engineer
Warner Robins Air Logistics Center
Avionics Production Division
Manufacturing Branch
380 Second Street, Suite 104
Building: 640, Mail Stop: LYPME
Robins AFB, GA 31098-1638
Voice: (912) 926 - 1970 Fax: (912) 926 - 7164
mailto:[log in to unmask]
http://www.robins.af.mil
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