consider, at least, changing to a SAMPLING PLAN in your evolution to
addressing board quality.  that way, you can still 'keep an eye on' the
copper plating concern.  from 'inspecting' to 'dock to stock' is quite the
change.
        should a processed bare board present a quality issue that is vendor
related, often, by the time its discovered, the cost of quality will have
greatly increased (vs discovering during your sampling).

-----Original Message-----
From: Michael Blackburn [mailto:[log in to unmask]]
Sent: Thursday, June 01, 2000 12:01 PM
To: [log in to unmask]
Subject: [TN] PCB Inspection


The company I work for is in the process of moving from inspecting incoming
pcbs to a "dock to stock" program. Also, we are outsourcing more of our pcb
assemblies and the feeling is that the CM should be responsible for the
quality and reliability of the bare board.

Does anyone have feedback about dock to stock programs? What kind of SPC are
you doing? Is a thourough audit of the board vendor and CM enough? What kind
of scrap/defect rates are you seeing?

The reason I'm asking about this is because in a recent post about baking
boards, someone responded that they were doing copper plating thickness
measurement in the wall of the PTH. We experienced the same problem (blow
holes) and ended up doing the same test.

I would appreciate any feedback/experiences you might have.

Sincerely,

Mike Blackburn

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