It has been my understanding that GR&R had to be performed when needed on specific guages ect.

For example - If I perform a GR&R on a set of calipers (High - middle - and low end of its range) I would be able to use that GR&R for all types of measurements the calipers are used for regardless of the fact that I may be measuring different parts.

At my new company they want to perform a GR&R on every part. Meaning we may check lenght on 20 different parts so they want to do 20 different GR&R's.

Is this a standard? Or am I correct in that we can use the same GR&R as long as it encompasses the same type measurement and range of the equipment used?

Jakes.

Happy to have you here at the Cove!

It's normal to perform R&R studies on 'families' of equipment, i.e. vernier calipers, micrometers, dial indicators etc., much as you suggest. So you are correct that it isn't going to need a study over 20 part numbers. The only time that might be a factor is if the parts are made from different materials, which might affect the results, e.g plastics, vs metals, etc.

I must be missing something. I think of a Gage R&R on a specific measurement device on a specific dimension on a specific part.

Repeatability
Reproducibility

Page 25 of TS states " Statistical studies shall be conducted to analyse the variation present in the results of each type of measuring test equipment system."

It is in groups or families. Now you would have to develop families of gauges unless you have Customer specifics which dictates how families are developed. Make sure that in the future that all 0 - 25 mm micrometers, as an example, are from the same company to eliminate discussions of various families.

Also, the TS standard does not state that one must do this every year as some companies are presently performing them.

Please do not perform R & R or the extremely heavy attribute gauge study every gauge or else you would end up hiring people and slowing down production for little value.

Good Luck!

I must be missing something. I think of a Gage R&R on a specific measurement device on a specific dimension on a specific part.

Repeatability
Reproducibility

Marc:
You are correct when the customer makes it a requirement (as is often the case in the automotive world). But my take is that if you are, for example, a machine shop, turning steel parts to customer prints, the use of a micrometer to measure a diameter isn't going to give (widely) different results for each part number made. Hence only the need for 'family' studies. Otherwise you'd be spending more time making the study than making parts..........

Thanks alot guys, I appreciate the help, it will definetly make my job a little easier.

Jake

Read this thread: Identifying common pitfalls in GR&R (gage R&R) studies - Measurement System Analysis (http://elsmar.com/Forums/showthread.php?t=15362) and this thread: Do I Need To Do Gage R&R On Each Device Or Just Each Family (http://elsmar.com/Forums/showthread.php?t=23800).

You can definitely study gages as a family, but do not do it blindly. Read the precautions in the two threads referenced above, and you'll be fine.