Pat,
I assume that your 9% failure rate is after operators have passed their work
on as good. Based on that, IMO you should ask the following questions:
Would my customer identify these as failures (through observation or failure
rates) also? In other words, are internal inspection standards more
stringent than necessary to meet customer or reliability requirements?
Are the operators able to identify the same defects as the inspection staff?
Are they adequately trained in defect identification and can they
demonstrate their expertise?
What will be done to improve operator quality to bring defect levels into an
acceptable range prior to inspection?
What monitoring steps will verify quality levels - customer complaints,
process audits, evaluation random of samples of finished products prior to
shipment?
What will be done if sample evaluation indicates that failure rates are
excessive?
These questions are meant to provoke an examination of the quality system
with regard to acceptability standards, operator training, process
monitoring, and remediation of non-conforming product. The operations you
mention are often not easily automated and rely primarily on operator skill,
attention, and motivation. Unless one is confident that these issues are
well controlled, it is foolish to remove a 100% inspection requirement. In
the long run, it is also more costly to perform 100% inspection than to fix
the causes of the defects.
Hope this is helpful.
Don Vischulis
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Diamond, Pat
Sent: Tuesday, November 05, 2002 2:57 AM
To: [log in to unmask]
Subject: [TN] Inspection levels
Dear all,
I would be interested in your thoughts/comments on 100% operator
self-inspection with no overcheck, my company is thinking of introducing
this and it frightens the life out of me. At present we run with overcheck
covering operator self inspection and and our faults to joints soldered is
running at about 9%. We do not manufacture PCB's, this is purely on solder
cup and Solder eyelets with all of it's inherent wire stripping etc.
Does anyone out there have any experience of this?
Regards,
Pat.
****************************************************************************
***************
The information transmitted is intended only for the person or entity to
which it is addressed and may contain confidential and/or privileged
material.
Any review, retransmission, dissemination or other use of, or taking of any
action in reliance upon, this information by persons or entities other than
the intended recipient is prohibited. If you received this in error, please
contact the sender and delete the material from any computer.
****************************************************************************
***************
Pat Diamond
Senior manufacturing Engineer
Weston Aerospace Tel: +44 (0)1252 868194
124 Victoria Road Fax: +44 (0)1252 370298
Farnborough, Hampshire, GU14 7PW Web www.westonaero.com>
England Email mailto:[log in to unmask]
---------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to
[log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to
[log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/html/forum.htm for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700
ext.5315
-----------------------------------------------------
---------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/html/forum.htm for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
-----------------------------------------------------
|
