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Subject:	Re: PWB Procurement Recommendations
From:	Jay Soderberg <[log in to unmask]>
Reply To:	[log in to unmask]
Date:	Tue, 30 Jun 1998 15:45:13 -0600
Content-Type:	text/plain
Parts/Attachments:	text/plain (46 lines)

In my humble opinion, a fabrication specification is essential.
Without it there is no basis of agreement about what the finished
product requirements are.  Unless specified somehow, the minimum
level of fabrication requirements will vary by PWB manufacturer,
which would be a LARGE headache at manufacturing.  Also, without
specifying fabrication requirements at the quoting stage, the prices
quoted will reflect varying levels of manufacture and you may end up
buying something that does not meet your needs because it was
inexpensive!

Personally, I would favor IPC specifications over
MIL-PRF-31032.  There are not too many board shops that are qualified
to MIL-PRF-31032 at this point.  The selection of shops is much
greater for IPC specifications.


> Date:          Tue, 30 Jun 1998 09:32:00 -0700
> From:          "arrigo.tony" <[log in to unmask]>
> Subject:       PWB Procurement Recommendations

> Can anyone tell me what is gained by specifying "Fabricate to
> Mil-PRF-31032 vs. IPC-xxx?"  Is a  fabrication specification even
> required when purchasing a multi-layer PWB at all?   Will all PWB
> manufactures give some minimum fabrication requirement if none is
> stated on the drawing or in the purchase order, or is it  always
> BUYER BEWARE??
>
> Thanks for your assistance.
>
> Tony Arrigo
>
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All opinions are my own and do not necessarily reflect the opinion of the Management or Ownership of this station.

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