# Gage RR Study on Load vs. Deflection Curve

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• #51655

weisusu
Member

I am doing a Gage R&R study for load vs deflection on a instron machine. The load at 0.100″ deflection is what I am interested at, however due to the set-up of the machine, I won’t always get the load at 0.100″ deflection. However, I can get load vs deflection curve relationship where I can predict the load at 0.100″ deflection. If I were to use the PREDICTED load at 0.100″ deflection, would that be a valid data point to use for the gage R&R study?

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#179617

RC
Participant

Let me see if I have this right. Are you measuring the reliability and reproducibility of operators or machines?If you are doing operators I would say that you’re trying to see how different operators _calculate_ predicted load at .100 in. deflection. So are you giving them Stress and Strain constants?

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#179618

Taylor
Participant

You would be making the assumption that part to part variation is zero. I also assume this is somewhat of a destructive test. For example if I measure the same part deflection multiple times the deflection curve vs load changes.

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#179628

weisusu
Member

I would like to evaluate repeatability and reproducibility of the test system. I designed a gage R&R study with two operators, three trials, and five parts.
For instance, the results for part 1 trial 1 for both operators are:
Operator 1, Trial 1, and Part 1: Load = 0.500 – 3.40*deflection. Predicted load at 0.100 deflection = 0.160
Operator 2, Trial 1, and Part 1: Load = 0.490 – 3.52*deflection. Prediction load at 0.100 deflection = 0.138
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I will be using loads 0.160 and 0.138, etc to perform a crossed gage R&R analysis. Is that a valid way of conducting a gage R&R study?

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