Can anyone share experience on doing GR&R for hardness tester...?
We have done them using the destructive GR&R method but the results are always poor.
We tried measure Pb, Ag, and Cu % content with the arc spark spectrometer using the same set of sample ingot from our process.
Can you sub-divide the ingot into 10 pieces and perform the test? It is possible that there is significant within ingot variation in the metal content, and portions of the ingot in close proximity would presumably have less variation than portions further apart. Also, does the test itself change the product in any way that would prohibit tests in near proximity? If so, how much distance is required between test areas?
Also, as with the hardness test response previously given, are there standard test blocks that could be used instead of ingots?
At the same time, Ppk has been done with result >1.66. I think it can also be supporting to the less-than-best GR&R results.