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Acceptable Gage R&R Output Results - EV, AV, R&R, PV, and TV


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  Post Number #1  
Old 3rd November 2000, 05:37 PM
JMitchell

 
 
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Gage R&R Output

I'm new to Gage R&R and am trying to determine what is the industry standard for a "good" result. The spreadsheet I downloaded outputs results for EV, AV, R&R, PV, and TV. Which output is the best to base judgments about the equipment on? And what is a typical acceptable value?

Your help is appreciated.

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  Post Number #2  
Old 3rd November 2000, 06:41 PM
Al Dyer

 
 
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JMITCHEL,

If you are in the automotive industry I would look in the AIAG MSA manual for general requirements for R&R. This general guideline is based on a 10%, 20%, 30% scale.

A realistic guideline should be determined based on the measurement discrimination required for the use of a specific gage. These guidelines should be noted in the appropriate areas of your quality system documentation.

R&R is a good place to start but the MSA system needs to evolve to determine bias, linearity, and stability.

This is a very general overview and I hope other members of the forum will have further input.

ASD...

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Al Dyer
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ullysses3@excite.com
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  Post Number #3  
Old 6th November 2000, 05:10 AM
Atul Khandekar's Avatar
Atul Khandekar

 
 
Total Posts: 1,457
R&R upto 10% means the measurement system is acceptable. If it is between 10% and 30%, the system may be acceptable on the basis of criticalitu of application. A lot of subject matter knowledge would have to go into justifying acceptability.

In addition, you should consider Control Chart analysis for every operator to determine influence of operator and methods over overall R&R. Control charts can also help determine adequacy of part-to-part variation.

Lastly, there are 2 more ways of determining adequacy of the system for a particular application, viz,
1.comparison of R&R error with Standard Deviation of the manufacturing process you are trying to control and
2.comparison of R&R error with design Tolerance.

These two methods would show you how much of your process std deviation (or tolerance) is 'eaten up' by measurement system error.

-Atul.

  Post Number #4  
Old 3rd December 2000, 03:33 AM
sagar

 
 
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dear atul
as you have said that acceptance limit is 10 % is good. But can you give e.g. of instrument supplier name who give / supply instrument with 10% RR with respect to process variation.

sagar
  Post Number #5  
Old 4th December 2000, 01:11 AM
Atul Khandekar's Avatar
Atul Khandekar

 
 
Total Posts: 1,457
I doubt if any gage manufacturer can actually guarantee 10% R&R.

You may refer to the discussions under the thread 'New Gage R&R' on this forum.

-Atul.
  Post Number #6  
Old 6th December 2000, 09:24 AM
elardila

 
 
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Question

Dear Sir.
I need your helping about the procedures to measure the capability and R&R of torque Wrenchers, thanks for for your helping.
S.O.S.
Please send information
elardila@hotmail.com
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