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Intro to MSA of Continuous Data – Part 6: R&R for Non-Replicable Measurements

Posted 24th July 2009 at 08:33 PM by Miner
This is the sixth in a series of articles about MSA. The focus of this article will be on measurement repeatability and reproducibility for non-replicable measurement systems, commonly called a destructive test.

Okay, what exactly is a non-replicable measurement system and why is it not just called a destructive measurement system? Let’s start with the definition of replicate.

In statistics, a replicable measurement system is one where any given part may be measured...
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Tags: msa
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Rating: 2 votes, 5.00 average.

Intro to MSA of Continuous Data – Part 7: R&R using Wheeler’s Honest Gage Study

Posted 7th August 2009 at 07:00 PM by Miner
Updated 10th August 2009 at 09:20 PM by Miner (Corrected link.)
This is the seventh in a series of articles about MSA. The focus of this article will be on alternative approaches to evaluating the repeatability and reproducibility (R&R) of a measurement system.

The de facto standard for R&R studies has been the approach documented in the AIAG MSA manual and required of companies certified to ISO TS 16949. As quality personnel move from the automotive industry into other industries, this approach has gained widespread familiarity...
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File Type: xls Wheeler's Honest Gauge Study.xls (302.5 KB, 86 views)
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Rating: 5 votes, 4.80 average.

Statistical process control for precision machining Part 1

Posted 2nd December 2008 at 04:27 PM by bobdoering
Updated 9th September 2009 at 10:56 AM by bobdoering
The unique requirements for control charting precision machining processes have been shared throughout many threads in the forum. I have decided to find a spot to put the concept all in one place.

STATISTICAL PROCESS CONTROL FOR PRECISION MACHINING

Many folks have attempted to implement X-barR charts for years in precision machining applications, only to be frustrated by tightly compressed control limits or unexpected bimodal distributions. The problem turns out...
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File Type: jpg X hi lo versus individuals.jpg (61.5 KB, 149 views)
Attached Files: 1. Scan for viruses before using, 2. Please report any 'bad' files by Reporting the post it is in, 3. Use at your Own Risk.
File Type: xls SPC Autoplot.xls (76.0 KB, 354 views)
File Type: xls SPC Actual Machining Process Data.xls (71.5 KB, 69 views)
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Rating: 3 votes, 4.67 average.

Statistical process control for precision machining Part 2

Posted 2nd December 2008 at 04:29 PM by bobdoering
Updated 19th February 2009 at 06:56 PM by bobdoering
Is This Charting Accepted By The Big 3 Automotive OEMs?

I have found that all customers (Big 3 and Japanese transplants) that I have trained on this concept (as a supplier) have accepted the concept, including its use for PPAP submissions. When it is all said and done, its simplicity makes it more understandable to customers and operators. There is no guarantee that every SQE will follow along. After all, we know the automotive industry better than that.... Most importantly, it follows...
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File Type: doc Data Set for Uniform Distribution.doc (227.0 KB, 180 views)
File Type: xls Uniform Distribution versus Central Limit Theory.xls (67.5 KB, 186 views)
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Rating: 5 votes, 4.60 average.

What Keeps Us from Learning?

Posted 22nd July 2008 at 09:53 AM by Dvora (Dvora's Musings on Quality)
Updated 21st August 2008 at 10:31 AM by Dvora
Thinking about some of the things in my first blog, about learning to use the tools we use...

I think another issue we all must face - whatever our primary skill - is what interferes with learning. We know people get frustrated with things like MS Word... and the tools are out there to learn, but many simply do not learn. Why?

I can only think of my own experience, what keeps me from learning, and what I've observed when I've trained others.

A biggy...
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