Re: MSA 3rd Edition Software for R&R Studies

Posted by Glenn Black on March 25, 2003 at 12:33:38:

In Reply to: MSA 3rd Edition Software for R&R Studies posted by Jason Vermeiren on March 25, 2003 at 12:19:52:

I would suggest that there are a number of programs, such as SQC Pack that are now (or soon will be) compliant. Purchase on the understanding that you will get the upgraded software for free if it isn't already compliant.

See American Society for Quality magazine, Quality Progress, for an
excellent listing of the major software vendors & their various features.
For Gauge R&R, PQA has written our own spreadsheet that does all the
calculations.

All of this is covered in PQA's training course on Measurement System Analysis and R&R Studies

In addition to the software, the following typical mistakes are often made when doing R&R studies:

1. Fail to have standardized measuring method that everybody is trained on, & following.

2. Randomizing all samples, test subjects, and trials so you don't have confounding of factors in the data. Over 90% of R&R studies are "unacceptable" for <=10% R&R. You will need non-confounded data to figure out why it failed at the next step, so you can fix it.  Don't skip this step, or you will soon be repeating your effort.

3. Intervention during the R&R study. DO NOT fix, stop an error, change the method, or anything else during an R&R study. You are invisible and a silent observer. Fix & change BETWEEN this R&R and the next trial. If R&R is hopelessly flawed, stop, fix, & re-start all over again.

4. Lab vs real world conditions. Do the R&R under real world noise, vibration, lighting, & timing. For example, your testers don't have all day to decide the "correct" measurement value. That's not real world.  Don't permit them to take all day during the R&R study.

5. Get both R&R's.  You need <=10% R&R for both your tolerance (helps decide if scrap or OK part), as well as for 10% R&R with reference to your normal process variation (helps monitor & control your manufacturing process). YOU MUST HAVE BOTH. You are fooling yourself if you only get one of these 10% R&R. DO NOT SKIP THIS CRITICAL PART. This is where an expert can really help you to achieve these mandatory goals.

6. Poor statistical data analysis. Fixing R&R's so you get 10% of spec and 10% of process variation is tough work. Use the best statistical tools available & someone who REALLY knows what they are doing with them to maximize the learning from each R&R. This will ensure your problem solving on your poor measurement systems is directed in the right direction, with no error nor waste.

Hope this helps

Glenn

Follow Ups:

• Re: MSA 3rd Edition Software for R&R Studies Jason Vermeiren 12:49:16 3/25/2003 (0)