Gage R&R for every gauge? Or is it only every type of gauge? MSA 3rd Edition

[lee01]

With regards to the above:

What we have decided to instigate to control and understand our Measurement System is to conduct an initial GRR on Measurement Type (Laser Trackers, CMM & Various hand held devices) per product.

Then we measure a known artefact such as the SRS system from Metronom every week to create an understanding or trends etc.

We then re-do the GRR every year just to make sure people do not forget how to do it.

Calibration is based on errors found during the weekly artefact check.

With regards to our CMM, we have cut the cost by a huge amount simply by not calibrating it every year, but calibrating it as and when required from the NAMAS traceable SRS artefact.

We now understand calibration requirements clearly, understand GRR results etc.

[Ramon Montoya]

My company just undergo the TS16949 certification, we passed the audit.

WE explain the auditor that we did the studies for each type mentioned on the control plan and to those that only measures a critical dimension of the assembly.

This was accepted, however MSA and his judgement will vary from person to person and auditor to auditor.

If your read the very first pages of the MSA manual you will see some comments that say that the studies referred on this manual should be implemented based on common sence... If I get the exact pages I will give it to you, this note allows it.

Regards...

[Garry]

Ford specific requirement (Nov2003)
Paragraph 4.35

All gauges used for checking Ford components/parts per the control plan shall have a gauge R&R performed in accordance with the appropriate methods described by the latest AIAG Measurement Systems Analysis Manual (MSA) to determine measurement capability.

Any measurement equipment not meeting the specifications stipulated in the MSA must be approved by STA.

Use of family gauge studies per the MSA is permissible and must be approved by STA

Variable gauge studies should utilize 10 parts, 3 operators and 3 trials. Attribute gauge studies should utilize 50 parts, 3 operators, 3 trials.

Effective attribute gauge study samples include parts within specification and parts outside specification for each criterion being measured and within the expected range of manufacturing variability.

Hope this clarifies some aspects

[antoine.dias]

It's on page 23 in bold lettertype.
About Strategy and planning before designing or buying new measuring equipment or system.

Best regards,
Antoine

[Ramon Montoya]

You must be carefull when selecting the method to do the attribute Gage R&R, there are two methods described in page 125:
A. Analytic Method
B. So call cross tab.

A method ont his page it says that is the most appropiate one (Right in the introduction paragraph).

B. method it says that requires customer approvals, so do not use the method that requires 50 samples (Cross Tab) unless you have approvals from all your automotive customers.

Analytical Method does not required approvals and it takes 8 samples only with one user, however it so confusing that in 3 months I have work on implementing it, so far I have not been able to understand, even after going to training for MSA implementation in Detroit to a company approved by AIAG.

[Ramon Montoya]

Regarding my comment about what equipment requires the MSA Studies, please read Chapter I-section C, in here it tells you that you can define the extend of the studies based on different conditions.

Is on Page 23.