Derivation of Gage R&R Formula and Calculations

M

marklee

#1
derivation of gage R&R calculations

Does anyone have a book or journal reference that shows how the formulas for gage R&R are developed? Specifically, where do the tables and other constants come from that are used in the Range and Average method of gage R&R. Anyone have worked examples comparing ANOVA method with Range and Average method?
Thanks,
Mark
 
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D

Don Winton

#2
If you go to:

--> Obsolete Link Removed 2003-09-24 by Marc <--

and find a link named 'Repeatability and Reliability" and download it. It should help.

Regards,

Don
 
M

marklee

#3
Don,
Thanks for pointing me to your good tutorial. I have some more questions and comments after reading this through:
1. You refer to "Duncans's text", and it looks like it is described in a footnote which I can't see on my screen (pdf file bug?). Can you give me the name of this text by Duncan that you cite?
2. Repeatability is defined by 5.15*sigma_ev. I have assumed that gage R&R was using 6 sigma (99.7% compared to 99.0%)which would use 6.00*sigma_ev instead of 5.15. Thanks for clearing this up.
3. I can see that standand deviation and range would be related by a constant, but I still don't see where they come from. What are behind the estimations of the "d2" parameter in the equation sigma_ev = R_bar_bar / d2? Is there a For/Next loop that generates these?
Thanks,
Mark
 

Marc

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#4
Don Winton said:
If you go to:

--> Obsolete Link Removed 2003-09-24 by Marc <--

and find a link named 'Repeatability and Reliability" and download it. It should help.
If anyone has a copy of this document, please let me know or attach to a post.

Thanks!
 
D

Darius

#7
I have a file, may be to elemental, but it take other aproach to the explanation of the calculations.

And also the Anova aproach

I hope this may help to clarify R&R

:vfunny:
 

Attachments

A

Atul Khandekar

#8
Sam said:
Marc,
This may be similar to what you are looking for. It was downloaded from this site in 2000.
Sam, Thanks a lot for that file. (.. and how I miss d'Wizard's lair!)

For derivation of Repeatability & Reproducibility formulae and the K factors, I was about to suggest Larry Barrentine's book "Concepts for R&R studies" ( referenced in the file above - available from ASQ for $25. I just received my copy about 10 days ago.)

For more information on the d2* factors, try the attached PDF document from AIAG.

Crossed and Nested ANOVA calculations can be found in any standard statistical text book on DOE. The one I used was Design of Experiments by Douglas Montgomery.
 

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