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November 2002

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Subject:
From:
"Randy Bock Sr." <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 5 Nov 2002 10:30:50 -0500
Content-Type:
text/plain
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text/plain (145 lines)
9% is a high percentage.    "Generally "speaking you should be looking for
5% or less,
target being 1.5%.


Randy
----- Original Message -----
From: Don Vischulis <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, November 05, 2002 9:54 AM
Subject: Re: [TN] Inspection levels


> 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.
>
>
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****************************************************************************
> ***************
> 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]
>
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