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Atul,
We have over 2,000 variable gauges on site, to do GR&R studies on all of them once a year is an impossible task.
We handle the problem by working to an 'audit schedule' where each TYPE of gauge is reviewed at least once per year. The gauge to be reviewed for the audit period is selected at random.
We also carry out two GR&R studies as part of our 6 Sigma projects. These are over and above the one carried out as per the schedule.
Geoff
We have over 2,000 variable gauges on site, to do GR&R studies on all of them once a year is an impossible task.
We handle the problem by working to an 'audit schedule' where each TYPE of gauge is reviewed at least once per year. The gauge to be reviewed for the audit period is selected at random.
We also carry out two GR&R studies as part of our 6 Sigma projects. These are over and above the one carried out as per the schedule.
Geoff
You really have to look at the over all use of the gage, its stability and such. For example - If you have a fairly stable gage and your cal cycle is every 6 months I'm not sure an R&R after each calibration will buy you anything. The R&R should not change after a calibration. If you wanted some useful info, you might do an R&R just after a calibration and then another one just prior to the next calibration.
Are you currently doing an R&R after every calibration?
Are you currently doing an R&R after every calibration?
Geoff , Marc
Yes, i would like to agree with what you are saying.
Actually, i'd much prefer to calibrate an instrument based on stability study. And since calibraton involves some adjustments to the instrument, i thought r&r is in order.
I have come across customers who insist on submitting r&r results with each consignment.
I am not sure if 'Audit Cycles' would be acceptable to them.
So, the original question remains:
- At what frequency should the MSA be repeated?
Are there any definitive guidelines? At least any thumb rules?
Yes, i would like to agree with what you are saying.
Actually, i'd much prefer to calibrate an instrument based on stability study. And since calibraton involves some adjustments to the instrument, i thought r&r is in order.
I have come across customers who insist on submitting r&r results with each consignment.
I am not sure if 'Audit Cycles' would be acceptable to them.
So, the original question remains:
- At what frequency should the MSA be repeated?
Are there any definitive guidelines? At least any thumb rules?
MSA Frequency
Hi folks!
I've read another thread on this subject from last year, but the question wasn't really answered. So I thought I'd ask the same question. http://Elsmar.com/Forums/showthread.php?t=1073
I've looked in the AIAG MSA book and haven't found anything definitive.
The problem I have is that a supplier to us has submitted an MSA for a gauge, and the study was performed in March 1992. In my opinion this isn't acceptable, but I can't really ask them to do it more frequently because in theory this may be acceptable to them (as they know the gauge).
But a 9 year frequeny for an MSA study is a bit excessive.
Does anybody have anthing substantive on this subject.
Hi folks!
I've read another thread on this subject from last year, but the question wasn't really answered. So I thought I'd ask the same question. http://Elsmar.com/Forums/showthread.php?t=1073
I've looked in the AIAG MSA book and haven't found anything definitive.
The problem I have is that a supplier to us has submitted an MSA for a gauge, and the study was performed in March 1992. In my opinion this isn't acceptable, but I can't really ask them to do it more frequently because in theory this may be acceptable to them (as they know the gauge).
But a 9 year frequeny for an MSA study is a bit excessive.
Does anybody have anthing substantive on this subject.
Last edited by a moderator:
A
Suart,
Not all that much definitive direction here, just a comment.
Stability is the measure of bias over time. My question to the supplier would be: How can you prove the stability of the gage over time if you have not performed any studies in ten years?
Sounds to me like the supplier is trying to get around the intent of the process. (please slap me for using the "I" word)
As the customer, you hold the big stick, depending on how big the supplier is!
ASD...
Not all that much definitive direction here, just a comment.
Stability is the measure of bias over time. My question to the supplier would be: How can you prove the stability of the gage over time if you have not performed any studies in ten years?
Sounds to me like the supplier is trying to get around the intent of the process. (please slap me for using the "I" word)
As the customer, you hold the big stick, depending on how big the supplier is!
ASD...
A
That's why I used the evil "I" word 
Just a personal opinion, but I believe that stability studies should be ongoing for the life of the gage. Of course cost comes into play and I would have different frequencies for a CMM and a set of calipers. Much of it is also based on amount of use, If I use a gage every hour every day I would have tighter frequency that a gage that I use 3 times a year. Unfortunately a very subjective topic and as always, your customer will have their own views that should probably be resolved during contract review or product realization.
Any thoughts people?
Just a personal opinion, but I believe that stability studies should be ongoing for the life of the gage. Of course cost comes into play and I would have different frequencies for a CMM and a set of calipers. Much of it is also based on amount of use, If I use a gage every hour every day I would have tighter frequency that a gage that I use 3 times a year. Unfortunately a very subjective topic and as always, your customer will have their own views that should probably be resolved during contract review or product realization.
Any thoughts people?
