Measurement Uncertainty Explanation per ISO/IEC 17025:2005 clause 5.10.4.2

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#1
I need some explanation if someone can help please.
ISO/IEC 17025:2005 clause 5.10.4.2 "When statements of compliance are made, the uncertainty of measurement shall be taken into account" . What is the interpretation, let's say I have CMM uncertainty .040mm and I am measuring feature that has tolerance +/- .015 deviate .008 from the nominal. Customer remeasure the same feature and result is .042 mm.
Now
#1 Is it appropriate for my lab to make a statement that can hold +/-.015mm tolerance when CMM uncertainty is .040 mm?
#2 Can I tell the customer that should take into account the uncertainty for the difference in the results?
#3 If I measure feature with same tolerance and the deviation is .020mm, Would that be acceptable taking into account .040mm my CMM uncertainty?
Any input would be greatly appreciated. Thanks!!!
 
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George Weiss

#2
Re: Measurment Uncertainty Explaination per ISO/IEC 17025:2005 clause 5.10.4.2

It sounds like you have a CMM uncertainty of +/- 0.40 something, and measuring a feature with +/-0.15 something tolerance, and found it to be + .008 something from nominal. In a great number of other threads it has been suggested that an accuracy/uncertainty of measurement would desirably be smaller, like one quarter to one tenth the attempted test value. You suggest you have an uncertainty of 40, and are testing an item with a test limit of 15. It sounds as if your test is upside down, or your stated question is.
Part of the question was taking uncertainties into account. I suggest looking at one of the many uncertainty documents, and looking at guard-banding to explain the use of the uncertainties a bit.

Uncertainty 8 pages @
http://www.uncertainty.com.au/The%20Drongo's%20Guide%20to%20Uncertainty.pdf
Agilent guardbanding for beginners @
http://www.agilent.com/metrology/pdf/guardband_beginners.pdf
NAMS UKAS M3003 @
http://www.ukas.com/library/Technical-Information/Pubs-Technical-Articles/Pubs-List/M3003.pdf
NIST tech. Note 1297 @
http://physics.nist.gov/Pubs/guidelines/TN1297/tn1297s.pdf
 

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#3
Re: Measurment Uncertainty Explaination per ISO/IEC 17025:2005 clause 5.10.4.2

George
Thanks for reply. I am not sure if you understood my questions. I am sorry I should of explain little better. In our scope of accreditation CMM BMC is (40 +.003L)um. We build gages so we measure and certify them. We tell the customer that we can hold +/- .015mm tolerance on the Datum features. I red about the guard bend and to tell you the truth I don't understand how to apply it in this case. I am not un Uncertainty expert so that's why I ask these questions in this forum.
Now, what is the interpretation, with above stated uncertainty,I am measuring feature that has tolerance +/- .015mm.In my measurement feature deviation is .008 from the nominal(gage certification pass)Customer re-measure the same feature and the deviation is .042 mm from the nominal (gage certification fail).
Questions(I think they are simple):
#1 Is it appropriate for my lab to make a statement that can hold +/-.015mm tolerance when CMM uncertainty is .040 mm?
#2 Can I tell the customer that should take into account the uncertainty for the difference in the results?
#3 If I measure feature with same tolerance and the deviation is .020mm, Would that be acceptable taking into account .040mm my CMM uncertainty?

 
J

Joe222

#4
Re: Measurment Uncertainty Explaination per ISO/IEC 17025:2005 clause 5.10.4.2

I need some explanation if someone can help please.
ISO/IEC 17025:2005 clause 5.10.4.2 "When statements of compliance are made, the uncertainty of measurement shall be taken into account" . What is the interpretation, let's say I have CMM uncertainty .040mm and I am measuring feature that has tolerance +/- .015 deviate .008 from the nominal. Customer remeasure the same feature and result is .042 mm.
Now
#1 Is it appropriate for my lab to make a statement that can hold +/-.015mm tolerance when CMM uncertainty is .040 mm?
#2 Can I tell the customer that should take into account the uncertainty for the difference in the results?
#3 If I measure feature with same tolerance and the deviation is .020mm, Would that be acceptable taking into account .040mm my CMM uncertainty?
Any input would be greatly appreciated. Thanks!!!
The above statement simply means that if you say that a gauge is in tolerance, you must consider the measurement uncertainty. Lets say that you were measuring 1 V with a tolerance of ± 0.1 V and your measurement uncertainty was ± 0.025 V. If the piece read 1.09 V, you really don't know that it is in tolerance, it could be a false pass based on your measurement uncertainty.
 
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