Point Outside of Control Limit for R Chart - This is not SPC...It's GR&R study

A

Anatta

#1
All,

we have an experience where in our GR&R report, there's an R chart which has a point out of control limit. This was caught by the TS auditor and he file us an non conformance for not taking any action when there is a point outside the range chart.

my question is, this is not SPC...it's GR&R study. Samples selected when out of range, is it compulsory for us to take any actions?

Please help. we have many GR&R with such scenario.

best regards,
Anatta:rolleyes:
 
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A

Atul Khandekar

#2
MSA manual provides a good explanation of how to interpret Range charts (Page 104): It says:
-If one appraiser is out of control, the method used differs from the others.
-If all appraisers have some out of control ranges, the measurement system is sensitive to appraiser technique.
-Range chart can assist in determining statistical control (or lack thereof) with respect to repeatability.

You need to take some action to improve this situation.
 

Miner

Forum Moderator
Staff member
Admin
#3
Atul is correct. If you do not take action, or at least identify the reason for this point out of control, you cannot depend on the results of the MSA. The reason could be something as simple as the recorder transposing digits in the measurement, or a spec of dirt on the part or gage, or it could be more complex as stated in the MSA manual and cited by Atul.

The bottom line is without a stable, in control, range chart, you cannot trust the standard deviation calculated from the average range. This means that you cannot trust any calculation using the standard deviation, which means all of the repeatability and reproducibility calculations.
 
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