Informational Expanded Gage R&R Analysis using Minitab

Bill_jvrsshurricane

Starting to get Involved
#1
Hello everyone. I am brand new to using quality tools such as Minitab. I can do some things in Excel but never used the data analysis tools. I have a lot to learn and am hoping someone can help me out with Minitab. I am trying to do an Expanded Gage R&R analysis. I chose expanded because it is an unbalanced sheet. When I click ok, I get the report shown below. It is also missing the r chart as well. I am aiming for a chart that was previously done but I don't know what was input into the fileds to create the charts in the file titled 1016test. Eventually, I will have to add more CMM's and operators, etc. as the R&R study progresses. But I don't know if my data is format correctly for Minitab, etc. I also don't know how to fully setup the dialog box. I greatly appreciate your help.
 

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Miner

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#2
You are using run order to designate your parts. In your analysis, this means that each part was only measured one time. Is this actually the case?
 

Miner

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Staff member
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#4
Your options are pretty limited then. You can create a Gage Run Chart. If you have a master measurement of the part, you could perform a Type 1 Study, which evaluates the repeatability and bias. You can use General Linear Model ANOVA to manually estimate the Repeatability and Reproducibility, but you will have to manually create all of the graphs and manually calculate metrics such as percent tolerance. You will not be able to evaluate the operator*part interaction or metrics such as ndc or percent study variation.
 

Bill_jvrsshurricane

Starting to get Involved
#5
Ok thanks. This is tough learning this but will make a great learning exercise for me since this is the first time I have used this software. Thanks for your help. :)
 

ncwalker

Trusted Information Resource
#8
I agree with Miner. If in your study you have just taken one part and measured it over and over, you have severely limited the knowledge you will gain from the study.

Imagine you are designing all weather tires. And you decide to test your new tire for traction on an asphalt road. You run a short course and take a few curves and call it a success. That's your study right now.

How does it perform on a wet road? A dirt road? A gravel road? Icy road?
Does the weight inside the car change things? How much?
Does the speed of the car change things? How much?

Of all these categories, which ones affect traction the most? Which factors affect traction so insignificantly they can be ignored?

That's a full study. More than one part, more than one operator, measured more than one time.
 

Bill_jvrsshurricane

Starting to get Involved
#9
Ok got it. I will request that we test at least 3 parts. We initially measured only 1 part a total of 33 times by 3 different operators. They were then going to send me the part and do the same thing and then the part would go through another round by a 3rd party location.
 
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