How often do you have to repeat a Gage R&R study?

P

phomer

#1
Could somebody please give me their views, how often do you have to repeat an R&R study, once? every year? I have looked in MSA but can not find the answer.

Thanks
Paul
 
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Jim Wynne

Staff member
Admin
#2
A GR&R study, properly conducted, will give you information about the various sources of variation at work in a measurement system. A study should be redone when A) a customer has a specific requirement for it, or B) when something changes that might negate the findings of the original study, such as the addition of new operators.
 
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D

Dr. Electron

#3
phomer said:
Could somebody please give me their views, how often do you have to repeat an R&R study, once? every year? I have looked in MSA but can not find the answer.

Thanks
Paul

Definitely not once....every year might be ok.

'R&R is intended to be an ongoing, peroidic assessment or monitoring tool. It is not a "do it once and we're done" technique'

A quote from Barrentine.
 
H

Heids

#4
Jim Wynne said:
A GR&R study, properly conducted, will give you information about the various sources of variation at work in a measurement system. A study should be redone when A) a customer has a specific requirement for it, or B) when something changes that might negate the findings of the original study, such as the addition of new operators.
You shouldn't do a GR&R just for the sake of doing one. I agree with Jim's statements that unless required by the customer or there's a change in the measurement system, there is no need to perform another GR&R. The results should still be valid. However, many things can cause your measurement system to change over time. There are six key elements that comprise a measurement system;
  1. the instrument doing the measuring,
  2. the operator,
  3. the part being measured,
  4. the method or procedure for measurement,
  5. the environment, and
  6. the tolerances you're working with.
A change in any one of these elements creates a new measurement system, which should trigger another measurement system analysis in order to understand what impact that change had on the entire system.

As long as the original MSA was properly conducted by considering the six elements and nothing about those elements have changed, you should be fine. Depending on the system and what you're measuring, this could mean running as many as several MSA's a year or as few as once every couple of years.
 

Miner

Forum Moderator
Staff member
Admin
#5
I agree with Jim. An MSA study can be a time-consuming proposition and should be done based on a specific need such as a customer or a change in the system.
 
B

briggs_joe

#6
If you're attempting to use your measurement to help weed out "outlier" parts, even though they may meet specifications, then a gage R&R may need to be performed more often.

For example, the precision of your parts' process when you do your initial GRR is x. Now, it's 3 months later, and the part's process is now .5x; in other words, the process creating the parts is now 50% more precise than it was before. You may now not be able to discriminate the outlier parts anymore; you'll need to perform another GRR to see how capable your measurement is at discriminating between parts with much less variation than before.
 
S

Santa

#7
Re: Gauge R&R studies - How often do you have to repeat a gage R&R study?

Because it can be time consuming, we set up parameters based on the following GR&R result:
0 < 10% - every three years
10 < 20% - every two years
20 to 30% - every year
 

bobdoering

Stop X-bar/R Madness!!
Trusted Information Resource
#8
Re: Gauge R&R studies - How often do you have to repeat a gage R&R study?

The fact is a correctly performed gage R&R never needs to be redone. There is no time function to gage R&R. It has one fundamental function: determine if the gage is the correct gage for the job. The portions of MSA that have a time function are calibration, stability, etc. They verify the gage system is still working correctly.

Often customers will ask for annual gage R&R's. They do it for one of three reasons -1. they believe they were not performed correctly the first time, 2. they think you likely changed the gage system and did not report it or 3. they have very little understanding of gage R&R themselves. However, those anomalies themselves do not justify multiple, ongoing gage R&Rs.
 
G

guruprasadb

#9
Re: Gauge R&R studies - How often do you have to repeat a gage R&R study?

Gauge R&R studies can be repeated based upon the frequency of the usage of instrument ,measurement criticality and equipment running cost
 

Helmut Jilling

Auditor / Consultant
#10
Re: Gauge R&R studies - How often do you have to repeat a gage R&R study?

The fact is a correctly performed gage R&R never needs to be redone. There is no time function to gage R&R. It has one fundamental function: determine if the gage is the correct gage for the job. The portions of MSA that have a time function are calibration, stability, etc. They verify the gage system is still working correctly.

Often customers will ask for annual gage R&R's. They do it for one of three reasons -1. they believe they were not performed correctly the first time, 2. they think you likely changed the gage system and did not report it or 3. they have very little understanding of gage R&R themselves. However, those anomalies themselves do not justify multiple, ongoing gage R&Rs.
Bob, I would think the time to perform a revised R & R is when the system has changed enough that the previous results are no longer valid. Most common, enough turnover in personnel that the user group has changed a lot. What are your thoughts?
 
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