Yordan, in a past life as manager of a CM, we had to deal with the same
situation. First, the OEM is responsible for the accuracy of the
documentation and you are under the obligation to build to print.
However, if you wish to develop a working relationship, any errors you
can point out and get corrected before the actual build benefits you
both. Developing your P&P data is an opportunity to find and make these
corrections. There will be times where the customer tells you to shove
it and build it to print. All you can do is CYA by specifying the
problems in the build documentation and forwarding them back to the
customer which will usually cause hard feelings. However, if you don't,
the finger pointing commences. That's what I had to do, and over time,
the barriers broke down and we were able to become more involved in the
design process. When the OEM realizes he's getting "free" engineering
and value added services, usually (but not always) they come around.
For the last 15 years, I've been on the design side of the equation and
wouldn't think of doing something without involving our CM's. We
actually customize our documentation to reflect the particular CM's
process requirements and have them review PCB layouts before fab. If
you can get your OEM to that level, everyone's life is easier. Bottom
line though, is the OEM is responsible for the specification.
Bob Croslin
Nielsen Media Research
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Yordan Venev
Sent: Thursday, November 18, 2004 11:12 AM
To: [log in to unmask]
Subject: [TN] CAD data for assembling of PCB.
Hi!
As a contract manufacturer we have to deal with various products
designed with different CAD programs. Due to this fact we are not able
to generate all the data we need for preparation of the PCB (SMD)
assembling - e.g.
Pick&Place file. We receive from the customers BOM and mounting plan
they are convinced that should do (many of the don't have previous
experience with automatic assembling). We ask the customer to submit the
Pick&Place file and ... there comes the problem - the data are not
always correct.
There were lots of cases when some components value in P&P differs from
the ones in BOM and even there are wrong reference positions. Since we
are not being informed about that, we usually find out about the
difference at the P&P equipment programming stage. Due to that we were
forced either to perform false/true check of both P&P and BOM files or
even component by component manual check BOM>mounting plan>P&P file.
My questions are:
1. Based on the good practice is it appropriate to insist for complete,
correct and checked P&P (and all other data) files?
2. Who is expected to be responsible for any mismatch in the
documentation?
Any opinions are greatly appreciated!
Best regards,
Yordan Venev
Manufacturing Manager
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