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Fails: Gage R&R

bfire85
In light of a gage R&R that will fail (will post the results when complete) on a $4K that someone in my company decided to purchase without the input of Quality, what has been the worst Gage R&R results you have seen from a gage?
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  • From international vocabulary definitions, I think it's strange to get better results in reproducibility than in repeatability...

    repeatability condition
    condition of measurement, out of a set of conditions that includes the same measurement procedure, same operators, same measuring system, same operating conditions and same
    location, and replicate measurements on the same or similar objects over a short period of time

    NOTE 1 A condition of measurement is a repeatability condition only with respect to a specified set of repeatability conditions.


    reproducibility condition
    condition of measurement, out of a set of conditions that includes different locations, operators, measuring systems, and replicate measurements on the same or similar objects

    NOTE 1 The different measuring systems may use different measurement procedures.

    NOTE 2 A specification should give the conditions changed and unchanged, to the extent practical.

    Right. From the data, each individual operator saw horrible repeatability between part iterations. However, all three operators were in the same ballpark. So say for instance, I had a range of 0.010" between Part 1, measuring between 0.002" and 0.012", the other two operators measured around that range as well. It's not like one operator measured 0.010" consistently, then operator 2 measured around 0.004" and operator 3 measured around 0.007". We all had major jumps, but our mins and maxes were close.

    And yes, all operators some jumps of 0.010" just by refixturing the part and remeasuring. This is how bad this gage is...Neutral face
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  • From international vocabulary definitions, I think it's strange to get better results in reproducibility than in repeatability...

    repeatability condition
    condition of measurement, out of a set of conditions that includes the same measurement procedure, same operators, same measuring system, same operating conditions and same
    location, and replicate measurements on the same or similar objects over a short period of time

    NOTE 1 A condition of measurement is a repeatability condition only with respect to a specified set of repeatability conditions.


    reproducibility condition
    condition of measurement, out of a set of conditions that includes different locations, operators, measuring systems, and replicate measurements on the same or similar objects

    NOTE 1 The different measuring systems may use different measurement procedures.

    NOTE 2 A specification should give the conditions changed and unchanged, to the extent practical.

    Right. From the data, each individual operator saw horrible repeatability between part iterations. However, all three operators were in the same ballpark. So say for instance, I had a range of 0.010" between Part 1, measuring between 0.002" and 0.012", the other two operators measured around that range as well. It's not like one operator measured 0.010" consistently, then operator 2 measured around 0.004" and operator 3 measured around 0.007". We all had major jumps, but our mins and maxes were close.

    And yes, all operators some jumps of 0.010" just by refixturing the part and remeasuring. This is how bad this gage is...Neutral face
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