Re: GR&R (Gage R&R) on a CMM (Coordinate Measuring Machine)
No promises that I'm not way off base here...if so I'll learn along with you...
The point of GRR is to measure how repeatable your measuring PROCESS is should an operator run the same process multiple times, and to measure how reproducable your measuring PROCESS is should someone else use that same process. This data is then compared to a specification range. Measuring the capability of the machine used a particular way makes sense. The comparing of that usage to a spec range also makes sense. Rating a piece of equipment to a spec range is where your customer's request ceases to make sense.
You might want to ask your customer what it is that they really want...they are asking for one thing, but what are they actually trying to achieve? Are you the manufacturer of the CMM?
It is common to ask for what you want poorly enough that the words of the question make no sense. Ask for clarification of what the goal is...in my experience, people ask for logical things but word the requests poorly enough that the requests make no sense. Funny thing is that I find myself doing the same thing!
Purpose...Plan...Progress...PEACHES! . . . "To me there is only one form of depravity - the man without a purpose." - Atlas Shrugged by Ayn Rand -
Last edited by Ninja; 4th January 2011 at 09:26 AM.