Gauge R&R For before - after process

K

Khaine

#1
Hi everybody.

I am considering a gauge R&R for a simple weight scale.
What makes it complicated is the nature of the measured feature.

The measured feature is the coating weight.
The way it is measured is as follow:
"Bright" uncoated samples are taken, marked and weighted on the scale.
Then they are placed in the infeed of the machine where they get sprayed with the coating and go through the internal bake oven to fix the coating.
The samples are taken at the exit of the oven.
Once they are "cold" enough, they get measured again on the same scale.
Weight is obtained by substracting before to after.

It sounds to me that the coating weight R&R is going to combine the variation of both before and after measurement and therefore be greater than what I would obtain by measuring "before samples" only.
The process is, I believe not capable, assumption that sequenced samples are going to have the same coating weight cannot be made.

Should I do a Gauge R&R for "dry" samples only and double the result ?
Any idea ?

Thanks !!! :thanx:
 
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Miner

Forum Moderator
Staff member
Admin
#2
No. Do the measurements before and after as you would for a standard study, but then calculate the difference in weights between the matched pairs of data (i.e, 2nd operator 3rd measure before - 2nd operator 3rd measure after). Perform the analysis on these differences.
 
T

trainerbob

#3
You need to use the coated parts as well as that is what the scale is to be measuring. You may need to increase the number of samples to get that "warm fuzzy feeling" that you are actually reading thecapability of the weighing process.
 

Bev D

Heretical Statistician
Staff member
Super Moderator
#5
It really is as simple as Miner said: measure the parts twice before and twice after. pairing the first and second readings before to the first and second readings after.

note: I use only 2 readings of 30 parts. I have found this to be much more informative.
 
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