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  Measurement, Test and Calibration
  Gage R&R

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Author Topic:   Gage R&R
Lurker (<10 Posts)

Posts: 1
From:Gallatin, MO USA
Registered: Jun 2000

posted 06 June 2000 08:31 AM     Click Here to See the Profile for jaker     Edit/Delete Message   Reply w/Quote
What is an acceptable Gage R&R system? Do you have to have a study on each instrument or can in be done by family (calipers, ht gauges, etc.)? Does it have to be done on production parts or can it be done on gage blocks used for calibration?

Forgive my ignorance!!!

[This message has been edited by jaker (edited 06 June 2000).]

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Marc Smith
Cheech Wizard

Posts: 4119
From:West Chester, OH, USA

posted 07 June 2000 08:33 AM     Click Here to See the Profile for Marc Smith   Click Here to Email Marc Smith     Edit/Delete Message   Reply w/Quote
As I understand the requirement....

Typically QS auditors expect to see an R&R done with production parts on each instrument cited in the control plan.

However, if you are really MSA savvy and are ready to explain how you address each part of your uncertainty budget, you can use other methods. For example, if you have 100 sets of 6" calipers of the same model from the same manufacturer and they were maufactured within a 'reasonable' relative time frame (say - all were manufactured in 1997 and 1998) - you can make an arguement that all have nearly the same uncertainty in so far as the instrument its self goes. You had best have a study to prove this is, in fact, the case.

Yup - you can use gage blocks.

But - in both of these you had best be able and ready to explain how you address the uncertainty associated with surfaces being measured. If you use the calipers on an edge to edge measurement where they will be seated much like on a gage block, you will probably have a lower uncertainty factor than if you are measuring an 'unstable' part feature such as a diameter on a gently grooved feature. The fact that the instrument is stable and precise does not address several other parts of your uncertainty budget for that measurement.

The bottom line is if you do an R&R on the specific instrument at the station where the part is being measured, on the feature being measured on the part which is being measured, by the techincians who will/are actually be doing the measurement you are addressing all of the uncertainty budget and fulfilling the auditors paradigm (you are showing the auditor what s/he expects to see).

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