Hello Everybody!
Do you know how must I do GRR for many operators, many measurement tapes and many characteristics?? In our company we use in production lines about 2000 measurement tapes ( about 1200 operators and many, many characteristics). There is imposible to do GRR for each operator and for each characteristic:mg:
--> do you know what can I do, to customers and auditors will by happy?

Thanks,
Sylwia

I would focus on one study that shows that the tape you have chosen to use (brand, increments etc.) is fit for use (capable of achieving the measurement with in tolerance). Then I would focus on a training system that assures that the operator is using the tape correctly. As long as you can prove that the gage; in this case a tape measure is the correct tool to use then you only have to prove your people are capable of using it correctly. This would be no different than people using gages in a quality lab.

Hello Everybody!
Do you know how must I do GRR for many operators, many measurement tapes and many characteristics?? In our company we use in production lines about 2000 measurement tapes ( about 1200 operators and many, many characteristics). --> do you know what can I do, to customers and auditors will by happy?

Thanks,
Sylwia

Sylwia,
You do not have to do GR&R for each operator. In concept, GR&R is a Random Effect Model Analysis of Variance. (No need to be intimidated. )
That means you are only to select randomly from your operators, measurement tapes, and 1 do GR&R for each measurement characteristics.

Random Effect Model Analysis of Variance is a study where you are not concerned with "how much each unit differ" but on how much they vary, and which causes the most variation. Ramdomly sampling your operator population and measurement tapes will do. Just do GR&R for each measurement characteristic that you are interested in.


Customers and auditors will be happy for that:agree1:
>>rey

Reynald- thank you for your answer.
I have just one issue--> I understand that, that I can random choose operators and tapes but what with characteristics--> on the one station there are on average 3 characteristics and one montage station has about 9 operations ( we have 150 montage stations:mg: ) It is impossible do GRR for each characteristic..
It is some insanity:biglaugh:

Reynald- thank you for your answer.
I have just one issue--> I understand that, that I can random choose operators and tapes but what with characteristics--> on the one station there are on average 3 characteristics and one montage station has about 9 operations ( we have 150 montage stations:mg: ) It is impossible do GRR for each characteristic..
It is some insanity:biglaugh:

The point of the exercise is to do a reasonable sampling to verify that the gage is a suitable gage for the job. It is difficult to use a GR&R for verifying a gage for dissimilar geometries, such as for measuring a round surface in comparison to measuring a flat surface, but for similar flat surfaces (for example), with similar tolerances one study should prove the point. Ususally, tighter tolerances are verified for GR&R, since more open tolerances of similar geometry should be OK. Also, most automotive customers like to see a verification that the gages specifically used for critical characteristics are suitable, by having a good GR&R. Sure, there are exceptions to every rule (like do what the customer wants - especially if you can not convince them otherwise - they sign the checks).

I have always held that the operators should not be chosen randomly, but should be representative of every level of operator that would be expected to use the gage - from a new shop floor operator to a QC lab technician. That way, you can tell how much variation the skill affects the results of that gage, no matter who uses the gage.

On a final note, people that require annual GR&R's really do not get it either. Gage R&R is a tool to determine if the gage is the correct gage for the job. It has no time function. That is what calibration is for. It verifies the gage is still good for the job.

Thank you Bob,
your explantation is very cleary for me and I agree with you:)
I hope now, that my customer agree with me:thanx: