Need a Nested Gage R&R Template in Excel? QI Macros Has One!
You Don't Have to be an Expert to Conduct a Nested Gage R&R Study
What is Nested Gage R&R?
This type of Gage R&R is associated with testing where simply running the test will destroy the part. With that, one operator measures each part accordingly.
The term "Nested" refers to one or more factor(s) being nested under another factor or factors, instead of other Gage R&R tests that are "Crossed" studies. A "Crossed" study is when the same parts are able to be tested, without being destroyed, by each operator, multiple times (e.g., Gage R&R MSA 4th).
ASQ provides these examples:
- Testing the amount of force required to open a bag of potato chips.
- Testing the strength of a rope until it breaks.
One key thing to keep in mind: With the product you are performing destructive testing on, it is required to find an item that is relatively consistent in every way - size, strength, material, etc.
QI Macros includes an easy to use Nested Gage R&R template that:
- performs all of the calculations
- interprets the results for you (acceptable or needs improvement)
- is compatible with AIAG Measurement Systems Analysis - MSA, 4th ed.
Nested Gage R&R Template Instructions
To open the template, click on the QI Macros menu > DOE Gage R&R FMEA > Gage R&R.
Then, click on the "Nested GAGER&R MSA 4th" tab.
Next, input your data into the Study:
And after you have inputted your data, just scroll down to view the results!
The Nested Gage R&R template uses ANOVA Method to evaluate your measurement system
It also draws a series of charts to visualize your results.
ANOVA Method Results
QI Macros calculations have been tested and validated against the AIAG MSA 4th edition. For more details view this Gage R&R validation test using Ford Motor Co data.
Average and Range Method Results in the Gage R&R Template
- The key cell to look at is the Total Gage R&R value in the Study Variation table (cell L60).
- A message regarding Gage System acceptability and recommendations are provided.
- NDC value and Total Gage R&R value both help indicate whether you have enough part variation for a valid test:
Turquoise = This aspect of your Gage System is acceptable
Yellow = This aspect of your Gage System MAY be acceptable
Red = This aspect of your Gage System needs improvement
In the Study Variation table:
If the Total Gage R&R < 10, Gage System is acceptable
If Total Gage R&R >= 10, Gage System MAY be acceptable
If Total Gage R&R >= 30, Gage System is NOT acceptable (needs improvement)
QI Macros saved us a ton of time.
They take all the guesswork out of it.- Richard Nardini, Apptec
Control Charts, Histograms, Scatter and Box Plots to Visualize Your Results
QI Macros template creates numerous charts to help you analyze the results. The most popular are grouped to the right of the calculations in columns R:AB. The remaining are displayed below the calculations. For more information about these charts refer to the AIAG MSA manual.
You don't have to be an expert.
Use QI Macros Gage R&R template to mistake-proof your calculations.
Download a free 30-day trial. Get the Gage R&R template now!
QI Macros Draws These Charts Too!
