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View Full Version : Calculating Capability-Subtract Gauge R & R Error?

Matthew_Hopkins
21st February 2005, 10:15 AM
Dear Forum Fellows,

As a quality engineer at my company I daily face the question of how to handle uncertainty in measurements. Please advise me on this common question:

If I've determined the accuracy of my measuring equipment with an R&R study and consequently determined the objects actual part-to-part variability, am I doing some logical error if I subtract the measurement error and use the "real" variance only, when calculating Cpk etc.? What do I have to be aware of ?

Thanks in advance.

//Matthew
Atul Khandekar
22nd February 2005, 03:14 AM
Welcome to the Cove, Matthew. :bigwave:

If you have access to the AIAG MSA manual, they have given an appendix explaining the relation between %R&R and process Capability.

Check out the file rrtocpk.pdf (http://elsmar.com/Forums/attachment.php?attachmentid=81) and other attachments in this thread (http://elsmar.com/Forums/showthread.php?t=3861).

The attached file may also help: