(((nodding in agreement))) And another good reason for lines of
communication between board shops and designers/customers... The design
specifications are a good foundation; however, if one is not familiar with
actual fabrication methods (a basic understanding at least) information may
end up on fab drawings or in PO's that will cause problems, an example might
be;
Start with 1/2 foil, plate up to 3 ounces, line width/space 3
mils...hmmmmm....
((this is not a made up...this requirement was actually on a fab drawing
sent to us))
... Hey, what do you say everyone on TechNet get together at Denny's (gotta
be Denny's, economic reasons and all that...industry downturns...etc etc)
and work on this more...hmmmm....
----- Original Message -----
From: "Werner Engelmaier" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, October 07, 2003 1:21 PM
Subject: Re: [TN] PTH Cu Plating Thickness-To Be or Not to Be (Class II)
> Hi Chris,
> You say "No one knows what notes to put on drawings because of
manufacturer
> constraints, what affects they really have and the differences between
> manufacturers. Those that do know these notes don't care to share them
because every
> time we do, someone who thinks they know so much better, take pop shots at
> these notes to prove their superior intelligence."
> Well, that is not quite true. all the pertinent information is in
IPC-D-279;
> however, since we are dealing with reliability, 279 is a guidelines
document
> not a standard like IPC-6012--that is also the reson why IPC-6012 does not
> address reliability.
>
> Regards,
> Werner Engelmaier
> Engelmaier Associates, L.C.
> Electronic Packaging, Interconnection and Reliability Consulting
> 7 Jasmine Run
> Ormond Beach, FL 32174 USA
> Phone: 386-437-8747, Fax: 386-437-8737, Cell: 386-316-5904
> E-mail: [log in to unmask], Website: www.engelmaier.com
>
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