Charles Barker@I-O INC
03/26/98 01:39 PM

Hi JoAnn,

Years ago, I created a two page, PWB SHOP MANUFACTURING TOLERANCES,
STANDARDS AND CAPABILITIES SURVEY form. I would send this to our
shops/potential shops for them to fill out to see how they stacked up
against what we were doing. It also gave me good back up data when someone
asked me whether or not they could do a certain thing when designing their
boards.

I will be updating this form soon (it may go to three pages) and will be
happy to send you a copy of it. With that information at hand, you will
then know just what each shop can and can't do as a part of their normal
day-to-day operation. I found that most shops, when asked: "Can you do
xxxxx?" will say YES, but they don't always tell you whether or not they
would have to push the envelope to reach that goal. I always want to know
what they are most comfortable with producing to get the maximum yield for
whatever the particular need is at hand.

Then there are those very detailed survey forms that are 20-30 or more
pages long............  That's another issue.




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cc:    (bcc: Charles Barker/US/I-O INC)
Subject:  [DC] Need suggestions




My boss and I were talking yesterday about what our board fabricators
can and cannot do.  We're being asked to use 12mil traces as a
minimum because anything smaller is an increase in price.  I assumed
8mil was the "standard", unless otherwise called for due to current
load, board size, etc.  What are you, in the real world, using for
your "plain Jane" signal traces?  And also, he keeps telling me we
use a foreign board fabricator for the boards that use soft gold.
Something about it uses arsenic in the process and domestic vendors
don't want the hassle or expense.  I know that Hadco does soft gold
and I think it's done in New York.  Does anyone have any info on
other companies located in the US who can do soft gold?
JoAnn L. Amerson
Design Librarian
Red Lion Controls, Inc.
E-mail: [log in to unmask]
Voice: (717) 767-6961 ext 6308

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