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September 2006

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Subject:
From:
Wayne Thayer <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Wayne Thayer <[log in to unmask]>
Date:
Thu, 28 Sep 2006 08:04:57 -0400
Content-Type:
text/plain
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A dimensioned cross-section showing all materials and layup.  If we're
not that serious, we'll put "suggested lay-up" on the title.  Most
vendors vary from our suggestions.  The better ones actually respond
with an alternate cross section for us to approve.

Wayne Thayer

>>> [log in to unmask] 9/28/2006 3:45:52 am >>>
Dear Fellow TechNetters,

Would you please share how you communicate your PCB build structures to
PCB fabricators, or, if you are a fabricator, how those which are
easiest to understand are presented to you.

For copper, is it best to quote (i) Nominal start weight or thickness,
(ii) minimum finished thickness to IPC-2221A tables before and/or after
plating if applicable?

For dielectric thickness, (i) specify value, (ii) give range (iii)
leave open?

Your advice and expertise is greatly appreciated.

Many thanks and regards,

Phil



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