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gage r&r (repeatability and reproducibility), msa (measurement system analysis)
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  #1  
Old 11th May 2006, 09:38 PM
fl350z fl350z is offline
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Let Me Help You How to determine the values of k1, k2, k3 in Gage R&R

hi all.. have smtn to ask u all..

how to determine the values k1, k2,k3?
is there a standard value for them?

how to determine which one to use in a gr&r study? based on number of operators? number of trials?

Thanks..

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  #2  
Old 12th May 2006, 08:38 AM
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k1,k2,k3

You can take the examples given in the MSA manual.

k1 is the constant in relation to the number of trials in the study.
2 trials 0,8862
3 trials 0,5908

k2 is the constant in relation to the number of appraisers in the study.
2 operators 0,7071
3 operators 0,5231

k3 is the constant in relation to the number of parts in the study.
Parts K3
2 0,7071
3 0,5231
4 0,4467
5 0,4030
6 0,3742
7 0,3534
8 0,3375
9 0,3249
10 0,3146

For further details, See MSA manual.

Best regards,

Antoine
Thanks to antoine.dias for your informative Post and/or Attachment!
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Old 17th January 2007, 08:35 AM
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Re: k1,k2,k3

Hi,
When I review some of the excel sheets, softwares, and AIAG MSA, i found 2 kind of K1, K2, K3 values.
Eg:
According to several softwares and excel files (minitab, spc for excel) k1 is:

Trials K1
2 4.5600
3 3.0500


According to the MSA handbook (3rd edition, page 114), and some softwares K1 is

Trials K1
2 0,8862
3 0,5908

Do you happen to know the reason of that???

Thank you,
  #4  
Old 18th January 2007, 05:07 AM
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Re: How to determine the values of k1, k2, k3 in Gage R&R

Welcome to the cove.

The difference you have found is due to the different approach in the MSA manual ( difference between version 2 and version 3 of the MSA manual )

Hope this helps,

Antoine
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Old 12th December 2007, 03:12 AM
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Re: How to determine the values of k1, k2, k3 in Gage R&R

I'm ok with the answer but what is the difference between the old system and the new? because the constant value are really differente and change considerably the result?

Anyone have an answer to this?
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Old 12th December 2007, 04:42 AM
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Re: How to determine the values of k1, k2, k3 in Gage R&R

Quote:
In Reply to Parent Post by Alex.G View Post

I'm ok with the answer but what is the difference between the old system and the new? because the constant value are really differente and change considerably the result?

Anyone have an answer to this?
The answer lies in the different equations used in Version 2 and Version 3.

You cannot just simply substitute the Version 3 K values in an Version 2 worksheet.

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  #7  
Old 12th December 2007, 05:29 AM
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Re: How to determine the values of k1, k2, k3 in Gage R&R

I checked the equation and they are exactly the same in the 2 cases??
Can u tell me which equation exactly is different ?
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Old 12th December 2007, 05:47 AM
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Re: How to determine the values of k1, k2, k3 in Gage R&R

Have a look at discussions in this thread: Values and results to check Validation of Gauge (Gage) R&R program and Warning as to MSA 3rd edition worksheets
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