Gage R&R - Can I use the same part for measurement

F

Farooko

#1
Hello there
I am new to R&R studies and I need some help. I have to do R&R but I can only use one part for measurement over and over again. Could any one please tell me what effect I am going to have on the results and if I need to change any thing in terms of formula. I am not interested in part to part variation.

Cheers
 
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bobdoering

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#2
What kind of characteristic are you measuring?

You can actually do this in some cases, for example if you have a round part, you can designate 5 locations about that diameter and instruct the participants to measure those 5 areas as their samples.

But, you need to recognize what that study means.

Does that represent the variation you would expect to see over the life of the process for that characteristic? (Even if you had 5 parts, you may not meet that criteria, by the way.) If not, then your PV is going to be understated. Therefore, your GRR as a %TV is going to be pretty high, because the calculation believes you are presenting a sample to it representative of the process variation over time. However, %Tolerance may be meaningful. ndc will also be a problem because of low PV.
 
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