MSA (Measurement Systems Analysis) with One Operator using a CMM or Common Calipers

bpillar

Starting to get Involved
#1
Hello, :bigwave:

I'm quite in trouble to understand which kind of MSA study I can perform in our metrology, considering only one operator that works using a CMM or common callipers. Can someone help me to choose the right method and suggest me a worsheet to perform it? :truce:

Thanks a lot.
Regards.
:thanx:
 
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Miner

Forum Moderator
Staff member
Admin
#2
Re: MSA (Measurement Systems Analysis) with One Operator using a CMM or Common Callip

Are you only interested in the repeatability and bias of the gage?

This is a Type 1 Gage study. See Rationale and Methodology for the Type 1 Gage Study from Minitab. If you do not have Minitab, you can analyze bias and repeatability using the file attached to my blog entry on MSA Part 3. See row 43 of the Stability tab.
 

bpillar

Starting to get Involved
#3
Re: MSA (Measurement Systems Analysis) with One Operator using a CMM or Common Callip

Hi,
Thanks a lot for your answer.
I think that study Type 1 is the right one, considering only one operator.
I'll try to perform the study using your excel worksheet (I know Minitab, but we haven't got any license).
Is it certified and conform to AIAG MSA 3rd edition? This only to be sure if I present it to ISO/TS certification body.

Thanks again.
bpillar
:applause::biglaugh:
 

Miner

Forum Moderator
Staff member
Admin
#4
Re: MSA (Measurement Systems Analysis) with One Operator using a CMM or Common Callip

The R&R section of my spreadsheet was validated against the Ford SW validation data set. I am not aware of a validation data set for the stability sheet.

Please note that my spreadsheet was not initially designed to be a Type 1 study, so it may not provide the exact same results. I will try to find the time to run a data set through Minitab's Type 1 study and the same data set through mine for comparison purposes.

I can confirm that the calculations are the same as those shown in the MSA manual, 3rd edition for estimating repeatability using a stability study.
 

Miner

Forum Moderator
Staff member
Admin
#5
Re: MSA (Measurement Systems Analysis) with One Operator using a CMM or Common Calipe

I ran a comparison between Minitab's Type 1 study and the estimate of Repeatability in my spreadsheet.

The calculation of bias is identical as is the test used to determine significance. The main difference lies in the calculation of the repeatability standard deviation.

Minitab calculates the overall standard deviation of the entire set of measurements. My spreadsheet calculates the standard deviation based on the subgroup ranges.
 
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