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Gauging Gage, Part 3

How to sample parts

Joel Smith
Thu, 03/13/2014 - 13:26
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In part 1 and part 2 of this series, we looked at the numbers of parts, operators, and replicates used in a gauge repeatability and reproducibility (GR&R) study and how accurately we could estimate %Contribution based on the choice for each. In doing so, I wanted to provide you with valuable and interesting information, but mostly I hoped to make you like me. I mean like me so much that if I said you were doing something flat-out wrong and had been for years, you’d hear me out before reverting back to being just indifferent toward me.

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Comments

Submitted by kingsld1 on Thu, 03/13/2014 - 10:48

Non-Dedicated gages

What is your suggestion for gages that are not dedicated to a particular part? i.e. CMM's, Optical Comparators.  These items could be used for very small as well as very large products.  At least around here they could be used on several hundred different items. 

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Submitted by willy@qsconsult.be on Thu, 03/13/2014 - 12:05

In reply to Non-Dedicated gages by kingsld1

Various measurements

My suggestion would be to use the rules for measurement uncertainty (ISO GUM) in stead of Gage R&R and always report the measurement results with the measurement uncertainty.

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Submitted by burnett on Thu, 03/13/2014 - 11:07

Number of distinct catagories

Frequently I don't know the underlying distribution and if I sample randomly I often get NDC < 5, forcing me to find parts that have higher part to part variation than the random samples.  What to do?

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Submitted by willy@qsconsult.be on Thu, 03/13/2014 - 12:02

In reply to Number of distinct catagories by burnett

Sampling parts and NDC

The problem is that when you organize a Gage R&R you use the parts that are available at that time and these are often produced in a small time frame so show low part variation and as a result you get a bad NDC even if the absolute measurement errror is very small. I never sample, I take 10 parts and use either tolerance width or historical variation as the basis to compare to. In fact most often tolerance width.  

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