Attribute gage r&r 1

[Joel_Lapointe]

Hi!

I have no experience into gage r&r for attribute gage validation (new engineer in training). So we have gages that are measuring a dimension with 3 attributes : to small, good and to big. I'm tasked to qualify those gages with a gage r&r process from AIAG MSA. According to our quality department, the gage r&r is made with 10 samples, 3 appraisers and 2 measurements. The thing is transferred to Minitab for calculations.
From that, everything is calculated with Kappa values for : within appraisers, each appraisers vs standard, between appraisers and all appraisers vs standard.

I don't see anything about the gages themselves to qualify them.

It is different from other gage r&r methods for continuous measurements that are giving a detailed influence of errors. My boss wants me to give him the calibration errors form the gages and the repeatability.
Well, how to interpret the results to give him numerical values for that?

Is there other calculations that gives these metrics?

Thank you.

Joel Lapointe

 

[greenimi]

OP
"I don't see anything about the gages themselves to qualify them."


Maybe you can use ASME Y14.43-2003 to dimension and tolerance the gages. Then you qualify the gages based on the 2.5 paragraph (2003 version of Y14.43) requirements of 5% or 10% rule

(Y14.43-2011 has similar requirements about the above rule)

copy-paste from ASME Y14.43-2011

4.5 Gage Geometric Tolerances Reflect Part
Geometric Tolerances
Each feature of the gage that represents a feature on
the workpiece is recommended to receive a tolerance
between 5% and 10% of the tolerance assigned to that
particular workpiece feature. The selection of a gaging
policy, as described in para. 4.3, will associate the gage
tolerances to the workpiece tolerances and determine
whether they are contained within or additive.
NOTE: This Standard recommends that the gage designer consider
5% of the part tolerance used as gage tolerance with an
additional 5% considered for wear allowance. These are intended
as guidelines from which to begin the gage design. Gage tolerance
selection shall take part function, safety, and economic ramifications
into consideration. Caution shall be used in consideration of
accumulated (tolerance stack-up) error with the gage components.

 

[3DDave]

https://www.gagesite.com/documents/Metrology%20Toolbox/Basics%20of%20Measurement.PDF