# Gage RR study

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• #36560

Kevin Jackson
Participant

In a gage R&R study, is there any tolerance level for %EV, %AV and %PV?? I know the %R&R must be less than 10% for the measurement system to be accurate and in some cases less than 20% is acceptable depending on the type of measurement that is being taken. Thank you

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#105900

Ivan
Participant

Dear Kevin,
%EV & %AV are the components of %R&R. Mathematically,
(R&R)=Sqrt(EV^2+AV^2).
As you can see, you can only balance between EV & AV to limit your R&R within 0.1
R&R is evaluated as a % of tolerance & % of process variation. If the measurement is to sort good parts from bad, you need to ensure %R&R based on tolerance. If the measurement is for the purpose of monitoring & controlling the process, you need to achieve 10% R&R based on process variation (PV). PV can be obtained from your capability study results. Usually, it is 5.15 * sigma.
Hope this helps.
Ivan.

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#138018

Kumar
Participant

I have a data .233,.235, .236, .239, .237, .234
Tol: .240 +/-.003
From here how i can calculate R&R percent.

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#138024

Jered Horn
Participant

Rules of thumb…When you conduct a gauge R&R study, set it up with at least 10 parts, at least 2 operators, and have each operator measure each part (randomly) at least two times.  It’s also good to conduct the study over a two-day period…repeat measurements are a day apart.
The data you presented is not sufficient for a gauge R&R study.

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#138038

Heebeegeebee BB
Participant

10/2 is a good rule of thumb.
I like 5/3.
Whatever works for you!
;-)

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#138040

Whitehurst
Participant

I as well like the 5/3/3 it has proven most reliable in manufacturing measurments.  Take a look at the minitab function if you have it available, or if you would like, i can send you my home brew excel one we used at Ford.

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#138084

Siva
Member

i a siva in chennai  98413 69686

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