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Quality Digest   |  Fri, 05/10/2019
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Quality Digest   |  Fri, 05/10/2019

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Ryan E. Day   |  Thu, 05/09/2019 Great stuff here

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When and How to Use Zero Acceptance Number Sampling
By: William A. Levinson 04/11/2019

Inspection is a mandatory but nonvalue-adding activity, and our objective is to do as little as possible, provided that we continue to fulfill the customer’s requirements. The zero acceptance number (c = 0) sampling plan requires far less inspection than the corresponding ANSI/ASQ Z1.4 (formerly MIL-STD 105) plan, and becomes viable when the supplier is extremely confident in its level of quality.1

An ANSI/ASQ Z1.4 plan consists of a sample size n, and an acceptance number c. The inspector checks n items, and accepts the lot if c or fewer defects or nonconformances are found. These plans are designed to give (roughly) a 95-percent chance of acceptance at the acceptable quality level (AQL), which is one of the parameters for the plan’s selection.

The c = 0 plan, on the other hand, rejects the lot if any defects or nonconformances are found, but it requires a considerably smaller sample size. The drawback is that the producer’s risk (α) of rejecting a lot at the AQL is usually far greater than the textbook 5 percent, so the c = 0 plan should be used only when quality is much better than the AQL. This reinforces a basic principle of industrial statistics: We can have low risks or small sample sizes, but we can’t have...

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Audits have long been viewed as a necessary evil, but did you know they can add tremendous value to your organization? Sign up now to access this curated collection and find out how.

1. The Basics of Internal Auditing
2. Improving the Effectiveness of Internal Auditing
3. Ten Essential Audit Questions
4. Process Auditing: A Change in How Auditors Work
5. Performing a Factory Audit in China

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By: Quality Digest 01/30/2019

Audits have long been viewed as a necessary evil, but did you know they can add tremendous value to your organization? Sign up now to access this curated collection and find out how.

1. The Basics of Internal Auditing
2. Improving the Effectiveness of Internal Auditing
3. Ten Essential Audit Questions
4. Process Auditing: A Change in How Auditors Work
5. Performing a Factory Audit in China

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By: Quality Digest 05/31/2018

Researchers at the National Institute of Standards and Technology (NIST) have been developing a novel way of measuring laser power. Their device, called the Radiation Pressure Power Meter (RPPM), makes its measurements using the force exerted by the laser light itself.

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The NIST team has now fully tested this instrument at the highest power to date—50 kilowatts (kW)—using a laser at the High Energy Laser Systems Test Facility (HELSTF), operated by the U.S. Army and located in New Mexico. By comparison, a 5-kW laser beam can cut through an inch of steel.

"We don't have tens of kilowatts of laser power at our disposal here at NIST," says NIST physicist Joshua Hadler. "This was an opportunity to go at power levels that we've never got to before."

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BSI Editorial Ad Test
By: Quality Digest 04/06/2018

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By: Quality Digest 03/22/2018

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