Destructive/Non-Repeatable Measurement Gage R&R

N

NatsDaddy

#1
Does anyone know of a good resource to provide information and instruction in how to perform and analyze GR&R studies for destructive and non-repeatable measurement such as Brinell hardness. I have read the AIAG MSA manual and MiniTab help topics (nested study) but did not get a good understanding in how to perform the test and analyze the results. I have struggled with whether to use production parts or standards. The production parts did not appear to represent a homogeneous sample, but I may be the problem and not the parts. Thanks
 
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SteelMaiden

Super Moderator
Super Moderator
#2
Good question Daddy, I was planning on asking a similar question today, so I'm happy to see that you are interested also. I am not as well versed on GR&R as I am some things, so I struggle with this stuff too. My question is a customer wants us to do GR&R on our tensile testers. I know we have several members who are very well versed in this subject, I'll bet that they will be happy to enlighten us!
 

Miner

Forum Moderator
Staff member
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#3
Take a look at my blog on non-replicable MSA studies.

Both the hardness and the tensile tests fall into the fifth category of non-replicable tests.

In both cases, split specimens is the best approach, followed by consecutive specimens. These are used for the repeat tests and operators and represent one part.

If you have other questions, please ask with specifics.
 

Miner

Forum Moderator
Staff member
Admin
#4
My question is a customer wants us to do GR&R on our tensile testers. I know we have several members who are very well versed in this subject, I'll bet that they will be happy to enlighten us!
Steel,
You are in luck today. :D I just remembered the following from a Six Sigma Black Belt project that I mentored. The BB had to perform an MSA on a tensile tester. I found the following article from Instron:

This article describes the use of springs in lieu of actual parts to provide a replicable R&R study. In our situation, we found springs with rates that would provide results similar to the destructive tests that we performed. We performed a crossed study on the springs and compared the measurement variation to historical part variation.
 
U

Umang Vidyarthi

#5
Does anyone know of a good resource to provide information and instruction in how to perform and analyze GR&R studies for destructive and non-repeatable measurement such as Brinell hardness. I have read the AIAG MSA manual and MiniTab help topics (nested study) but did not get a good understanding in how to perform the test and analyze the results. I have struggled with whether to use production parts or standards. The production parts did not appear to represent a homogeneous sample, but I may be the problem and not the parts. Thanks
Miner has provided very good information. Here is one more Non-Replicable GRR case study, using ANOVA method, by David Benham of Daimler Chrysler Corporation.

Hope this is useful.

Umang :D
 

bobdoering

Stop X-bar/R Madness!!
Trusted Information Resource
#6
Steel,
You are in luck today. :D I just remembered the following from a Six Sigma Black Belt project that I mentored. The BB had to perform an MSA on a tensile tester. I found the following article from Instron:

This article describes the use of springs in lieu of actual parts to provide a replicable R&R study. In our situation, we found springs with rates that would provide results similar to the destructive tests that we performed. We performed a crossed study on the springs and compared the measurement variation to historical part variation.
Updated link:

GR&R: Understanding Sources of Variation in Mechanical Testing Results
 
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