Jan 18, 2012 · Then you could keep AQL=10, but the sample size would vary from 5 to 125 depending on the lot size. However, the acceptance number would somewhere between 1 and 21! 2) Choose a more stringent AQL, but keep the Ac=0. For example, you could go for AQL = 6.5 with a sample size of 2. Or you could go for AQL = 1 with a sample size of 13.

Sep 23, 2002 · Hello, I bought the ISO 2859-1. This is a good tools to qualifiate the production without made an exhaustiv check. The difficulty is that the lot and the AQL are different. Could someone tell me where I can find a software (macro on excell), which permett to calculate the sample if i give...

Jun 19, 2002 · The problem is, AQL is an Acceptable Quality level, not the Actual Quality Level. AQL is the quality level that would be detectable under a certain sampling plan. Also strictly speaking, the LTPD * 10,000 = PPM nonconforming .

Jul 23, 2005 · * the maximum percentage of defective units that you would like (aka AQL) * alpha (the odds of rejecting a lot that just barely meets expectations) * the percentage of defective units that you will NOT accept (let's call it UQL for unacceptable quality level) * beta (the odds of accepting a lot that fails to meet this minimum standard)

Sep 13, 2010 · AQL plans provide pretty much the oppose of the sort of confidence you want. A typical Level II normal inspection tells you that you are "NOT 95% confident the lot is bad" so you accept the lot, even though bad lots could get by quite often. You presumable want to be "95% confident the lot is NOT bad" so you can accept the lot with confidence.

Apr 17, 2010 · Often the AQL is set by a contract or tradition. Often producer's risk =0.05 and consumer's risk = 0.1. As for LTPD, a glance thru the Z1.4 tables show that . LTPD ~ 2*AQL for tightened inspection and/or large lots; LTPD ~ 5*AQL for medium inspection and/or medium-sized lots; LTPD ~ 40*AQL for reduced inspection and/or small-sized lots

Jan 30, 2009 · We employ a 0.10 AQL sample plan for lot sizes 3201 - 10,000 for critical attribute defects (c = 0, n = 125) and, for cosmetic defects, the acceptance number is 2 (using the same 125 pc sample). This is not a standardized AQL based on the ANSI Z-1.4 standard and I would like to convert the plan used for cosmetic defects into an AQL.

Sep 27, 2010 · From standard AQL sampling chart, your sample sizes would be higher. 35,001-150,000pcs is sampling N and 150,001-500,000pcs is sampling P. For Normal Inspection N is 500pcs and P is 800pcs. Sample N, Normal (500): at 2.5% AQL, lot would be rejected if 22 samples are out of spec; at .25% AQL, lot would be rejected if 4 samples are out of spec.

Apr 2, 2010 · Re: AQL for Zero Defects The zero defects statement is listed on the contract. Although the spec says that the AQL should be specified on the contract, the zero defects note is the only clue. This is for final inspection. We need to show the customer inspector how we develop our sampling plan. I think I'm missing part of the puzzle.

Dec 3, 2014 · Hello, We will soon recieve a shipment of products from a supplier and the quantity is 8000 pieces. The requirement from us is that they fullfill Cpk of 1.67. We have to take a sample size from this batch (lot) and verify whether they are ok or not. As i can see from Minitab 17 , a sampling plan...