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June 2006

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Subject:
From:
Franklin D Asbell <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Franklin D Asbell <[log in to unmask]>
Date:
Tue, 6 Jun 2006 13:53:23 -0500
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Technical Committee 5-22G??? Which one is this?

Franklin

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Roland Jaquet
Sent: Tuesday, June 06, 2006 12:14 PM
To: [log in to unmask]
Subject: Re: [TN] How are PCB & Assembly manufacturers measuring scrap?

Dear Jack,

Thanks to Denny I learn there is an IPC committee 5-22G in regards to
Production scrap (Rejects) and this subject is of acute interest to me as I
believe there is some major flows in Bare Board Manufacturing measurement
of Defect and Rejects.

I do not know how to get information on what has been done and what I could
read in order to follow the path of the wise men..

I seek to make measurements of Rejects and Defects at the Electrical Test
level (keeping in mind we are on Bare Boards).

I would appreciate your help as I would appreciate anyone's input as well.

Thank you very much

PS I am a member of EIPC

Regards to Denny, and thank you.

Meilleures salutations
Very Best Regards
Rol@nd

www.PCBspecialist.com
Roland Jaquet
14 Champ Budin
1258 Perly, GENEVA
Switzerland

Tel         +41-22-880-0405
Fax         +41-22-880-0409
Mobile   +41-79-203-3723

There are three constants in life...
Change, Choice and Principles.
Stephen R. Covey


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Dennis Fritz
Sent: Thursday, April 20, 2006 4:18 AM
To: [log in to unmask]
Subject: Re: [TN] How are PCB & Assembly manufacturers measuring scrap?

The assembly side PWB manufacture has worked hard to quanify  yield in
terms
of "defects per million opportunities - DPMO".   While  this is not
actually a
measure of scrap, this does even out differences between  simple and
complex
assemblies

Recently, the same group has started to try to quanify board  fab in some
similar terms to DPMO.   Board fabrication is not so  easy to quantify as
it is
harder to define an individual "opportunity".

At Apex/Expo time, this group was collecting the defect codes  from several
board fabrication shops to try to get a feel for some metrics the
committee
could track.  Anyone interested should contact IPC Committee  5-22G under
Greg
Hurst of BAE Systems or IPC Technical Staff LIason Jack  Crawford, as a
start.

Denny Fritz
MacDermid, Inc

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847-615-7100 ext.2815
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