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June 1999

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Subject:
From:
Karl Sauter <[log in to unmask]>
Reply To:
Karl Sauter <[log in to unmask]>
Date:
Wed, 9 Jun 1999 14:34:01 -0700
Content-Type:
TEXT/plain
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TEXT/plain (74 lines)
Dan,

A periodic 100 percent inspection will most accurately and effectively provide
the information you are interested in.  It need not interfere with production
using c=0 inspection which is a proven cost-effective go/no-go screen for
operations.

Regards,
Karl Sauter
Sun Microsystems


> Date: Wed, 9 Jun 1999 13:59:36 -0700
> From: Dan Brandler <[log in to unmask]>
> Subject: Re: [TN] ASSY: Sampling plans
> X-To: [log in to unmask]
> To: [log in to unmask]
>
> Although Sampling Plans with zero acceptance numbers are fairly common in the
> industry, one of the problems of a zero accept number is that the inspection
> log may look like this...
>
> 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
> 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
> 0,0,0,0,0,0,0,0,0,1 ... (Oh no! A defect!).
>
> The problem is that there is no warning that the quality is dropping or that
> a defect is about to show up. Furthermore, the data, all zeros, provides no
> way to estimate confidence limits around the zero percent defective estimate
> of the quality of the prior lots.
>
> Sometimes, an accept number of one is better than zero even though a larger
> sample size is required.
>
> Dan Brandler.
>
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