marcusja2002

Involved In Discussions
#1
I've combed the internet and the cove and can't seem to locate the answer I'm looking for.

I looked through all of ANSI 1.4 and couldnt find a sampling plan for zero defects.

Most of the charts allow for some parts to be found as failures but still accept the lot. The problem is if I just say only accept on zero is the sample size would be larger than necessary.

Is there a standard out there for a zero defect inspection chart?

Thanks in advance.
 
#2
Not sure what you mean by "a sampling plan for zero defects". Do you mean that you want to be confident that there are zero defects in a given lot?

The only way to do this is by 100% sampling.

You say that an accept on zero (even with a low-risk verification level?) is still too large a sample size?

How do you expect to arrive at a high degree of confidence that there are "zero defects" without large - or 100% - sampling?
 
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Mike S.

An Early 'Cover'
#3
I think you are asking about what is known as C=0 sampling plans. There are threads on here about this. Also look up ASQ H1331 or Nicholas Squeglia's Zero Acceptance Number Sampling Plans.
 

ScottK

Not out of the crisis
Staff member
Super Moderator
#4
I use Squeglia's "Zero Acceptance Number Sampling Plans - Fifth Edition" you can get it from ASQ
 

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