Weight Scale Gage R&R (Gage Repeatability and Reproducibility)

S

Shahzad67

#1
I have a customer requesting a gage r&r on weight scale. We ship customers a fabricated kit. In the kit there are small bags with various hardware components screws etc. We had few instances where we were short of a screw or a clip. We started weighing the bags in order to detect any non conformances. We have took a sample population of 50 bags and came up with a nominal weight and tolerances. Has anyone done a GRR on a scale? Any help will be appreciated.
 
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T

tomvehoski

#2
I have in the past, mainly looking at a scale calibration company when we needed to determine their measurement uncertainty. As I recall, with a digital scale the operator is pretty much insignificant, so it more or less comes down to the scale.

If you are still having issues you may need to look at shifting your tolerances to err to the high side and include extra parts. The 1/10 of a cent you lose in an extra part is probably worth not having to deal with shortage problems. You could also have instances where the customer dropped a screw down the heat register and is now complaining to get a replacement for free.

It should still not be too difficult to do a R&R to appease your customer. Get 10 bags of parts and three operators and do the study.
 
L

LLIMA

#3
I have the same issue. As a proces control parameter, I have to measure the part weight after and before and chemical proces, with a max lost of weight around 0,5%.
I will make the R&R next week and report my experiences.

regards
 
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