Zero defects - Which sampling procdure is suitable? E.g. ISO2859

S

Stevenli

#1
Dear all,

The zero defect for attribute data in TS2 is introduced. Does any body can tell me which sampling procdure is suitable? E.g. ISO2859 and just change the AC=0?

I have no idea for this!

Thanks and regards
 
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P

p_tww

#2
Stevenli said:
Dear all,

The zero defect for attribute data in TS2 is introduced. Does any body can tell me which sampling procdure is suitable? E.g. ISO2859 and just change the AC=0?

I have no idea for this!

Thanks and regards
zero defect was a target you would never reach it.
why it was mentioned in TS2? It hope the company could change concept on quality control, that was defect prevent(before activities) other than inspection(after activities).

ISO2859 was still focused on sampling.
you could refer to MIL-STD-1916, AC=0 and SPC application is strongly recommended.
hope help
 
#3
Stevenli,
I am not familiar with ISO 2859, but, for the AC number; for any attribute sampling plan set it to "0".
 
A

A Navajo - 2012

#4
Zero Defects

What the TS2 referrs to Zero defect for Attribute sampling is that your acceptance number should be Zero (0) and reject should be 1
Clause 7.1.2 Acceptance Critera : Example: Sample Size 125, Acc=O and Rej=1.
Hope this helps.
:D
 

Tim Folkerts

Super Moderator
#5
I haven't dealt with ISO2859, but it appears that ISO2859 = MIL-STD-105E = ANSI/ASQ Z1.4.

In that case, you certainly CANNOT just change AC to 0. By simply lowering the acceptance number, you are increasing the risk of accepting a bad lot. If you want to start with ISO2859 = MIL-STD-105E = ANSI/ASQ Z1.4, my personally opinion would be to choose the AQL you are comfortable with, then find the sample size at that AQL which already uses AC=0. This may well mean sampling few pieces than suggested by the plan, but it puts the alpha and beta risk at least in the right general range for your AQL.


Tim F
 
M

M Greenaway

#6
As mentioned in the previous post you cannot just knock down the acceptance number to zero in a sampling plan as this has no basis on statistical probability, and the operating characteristic curve would no longer be valid for the sampling plan.

If your customer will not accept any rejects in my opinion you cannot do sampling inspection.
 
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