Gage R&R is well-defined for..well..gages.
What do you do when faced with a device that’s not a typical dimension gage? Say, what about the case of Infrared or IR Radiation Thermometers; can you do a Gage R&R evaluation with them?
Been there. Done that.
But it wasn’t simply aiming an instrument into a blackbody furnace N times, or setting one up, aligned to a furnace and turning it on and off X times. Those are foolish exercises, a waste of time in my book, and nothing like a true measure of R&R.
Such a testing method wouldn’t pass a common sense question, like: What did you learn that helps you understand the measurement variability of the device in the hands of a trained or experienced user?
If there is sufficient interest in this subject, I will consider going further and sharing my experience in more depth. However, I need to have a good reason.
Email me: at RandR at temperatures.com if interested. (clearly this email address needs a common modification to work properly- this address format minimizes spam input from email spambots)
If there’s enough interest, say over the next few months-it’s now June 2007, I’ll keep the offer open until the end of the summer-September 20th. If at any point I hear from more than a few dozen interestd parties, I will add the “Rest of The Infrared R&R Story”.
If there’s less than that number by then, I’ll share my info by direct email (bcc to keep the email addresses anonymous) to those who send in their return email address, rather than clogging blog space.
Thanks for visiting,
Ray Peacock
TEMPERATURES.COM, INC. publishes information about measurement devices and measurement on its websites. The sites have articles, directories and news to foster competent measurements & analysis in industry & science. Sites are free. Submissions by visitors are encouraged and reviewed. Sites as of August 2007 are: lehos tecHeadlines, measureNEWS, About Temperature Sensors, TempSensor Directories, TempSensorNEWS, Measurement Databases, (MeasurementBlog.com)MeasurementMedia.com and MeasurementDevices.com
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[...] fact, the recent post asks the rhetorical question Gage R&R For IR Thermometers?. The author promises to delve deeper into developing a procedure needed to do a sensible R&R [...]
I also said I would spend the time to do it if there was enough interest by September 20, 2007.
After two months, yours is the only comment that even hints at an interest.
Anyone else? There’s less than a month left!
GRP
I sent you an email and I am very interested as to how you commence a gauge r&r with a IR camera. Lets say a flir a A20M, with an accuracy of +/- 2%. I have performed repeated tests with the camera to find the % process using minitab at a passing level when our samples are kept in the same spot. When we remove our samples and replace them, our process fails dramaitcally.
-James Abrams
Mr, Abrams:
Thanks for your comment. I’ll have a look at your email later today and perhaps respond directly.
You have illustrated part of the problem of setting up a meaningful Gage R&R test; one needs multiple repeats with multiple operators to measure results from multiple objects that are different in the parameter you wish to measure.
The questions about how much of each and how repeatable each is will be answered by the measurement results, correctly analyzed. Minitab should do the analysis “with its eyes closed”..
The purpose of the Gage R&R test, as I understand it, is to separate and quantify the two major sources of measurement variation, the equipment and the operators.
But the measurements need to also be under conditions that are highly repeatable and stable to begin with. Sounds like something is changing and you are not fully aware of it. Maybe, maybe not; I’ll check your email for details.