Gauge Analysis with 2 Complimentary Measurements

D

DivingDoug

#1
Hi all,
I am relatively new to the world of MSA (< 1 yr) and, with training options being stifled by the corporate monster, am having to learn as I go.

I am completing a gauge study on a piece of equipment that will ultimately measure only a single characteristic on a finished good and completing the MSA on that aspect of the equipment is pretty straight forward. In a one-time setup up the equipment however, there are two other characteristics that need to be confirmed to be consistent.

To set this up, I am essentially recording a pressure level and a vacuum level during a single sequence. I have completed a standard run of 15 parts, 3 operators and 3 repetitions for 135 sequences. For each sequence, I have two results, pressure & vacuum.

I need to determine if there is a method to incorporate both of the results into a single study as there is not necessarily a direct correlation between the two values but if one value is out of range, the entire sequence then is a fail regardless of the other value. I also have a fear that I will not achieve the desired number of categories but am not sure how to combat this as I have no access to a device to measure to a higher resolution.

Note that the study is being completed on the equipment creating the backloads, not the device making the measurements (A Beta calibration device that has a valid calibration)

I have attached the actual data for reference.

Any help is appreciated

Doug
 

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B

Barbara B

#2
Re: Gauge analysis w/ 2 complimentary measurements

The factor which affects the result (either in pressure or in vacuum) most, is the operator, so irrespective of the combination of both measurements, the measurement system is poor. (And you're right: The number of distinct categories is ndc=1 for both.)

To combine two uncorrelated measurements into one figure you can use a desirability function which gives a number between 0 (not desired at all) and 1 (jackpot) instead of two or more results like pressure and vacuum. You can find more details in the online engineering and statistics handbook (5.5.3.2.2. Multiple responses: The desirability approach). This method is used mainly with optimization in design of experiments, but could easility be adopted to your measurement analysis.

Best regards,

Barbara
 
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