This issue has been of concern to many folks in the industry for several reasons.
When the project was proposed last fall, over 200 people from all parts of the PCB
manufacturing and assembly industry expressed interest.  Some wanted a common method
to be able to compute Defects per Million Opportunities (DPMO) at the end of the
assembly process as a means to benchmark companies against each other.  The work in
progress for this is IPC-7912 Calculation of DPMO in electronic Assembly Acceptance
Inspection.  Another group is concerned with tracking every process indicator as well
as end item defects at every step of the assembly process.  This data can be used for
SPC/CPI.  The work in progess for this is IPC-9261 Calculation of DPMO in Electronic
Assembly Operations.  The documents are in early draft stages and at the task group
meeting several weeks ago they set some ambitious goals.  The next scheduled meeting
of this group will be with our fall committee meetings at IPC-SMTA Electronics
Assembly EXPO in Providence RI October 24-29.  The task group may choose to have an
Interim Meeting later in the summer if significant progress is made on the documents,
though.  Your association's leaders for this project are Fritz Byle (Rockwell/Allen
Bradley) and Tom Olafsson (Teradyne).

Jack Crawford, IPC Project Manger - Assembly
2215 Sanders Road, Northbrook IL  60062-6135
[log in to unmask]        http://www.ipc.org
847-509-9700 x 393
fax 847-509-9798

>>> Doug Brooks <[log in to unmask]> 03/19/98 12:23PM >>>
At 01:09 PM 3/19/98 EST, you wrote:
>My company is unclear as to how we should be recording and reporting defects
>with our PCB assemblies.  Some think that all shorts and opens prior to
touch-
>up should be reported as defects, others believe we should report only
defects
>found after touch-up.


Since "touch-up" is a standard, expected part of the process, the process
is not complete until after touch-up. I can't imagine why people would
want to record defects prior to process completion. UNLESS the intent
was to improve this specific part of the process, in which case these
are the ONLY defects relevant to that intent.

My opinion only .....

Doug Brooks
.
****************************************************
Doug Brooks, President              [log in to unmask]
UltraCAD Design, Inc.           http://www.ultracad.com

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