Tolerance zone for Gage RR.
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RonJ.
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March 12, 2008 at 1:04 am #49565
jediblackbeltParticipant@jediblackbeltInclude @jediblackbelt in your post and this person will
be notified via email.I need help on a subject for “can’t tell zone” on my spec limits. I have a note written in my manual from a few years ago that from the gage RR you can develop a band around a spec limit where within it you can’t tell good from bad. My note says it is 2/3 x the standard deviation of the measurement system. Does this sound familiar to anybody? If so, could somebody elaborate if that is correct or how do you calculate it?
Thanks in advance.0March 12, 2008 at 11:44 am #169584I have never heard of the rule, but there is some logic to it.2/3’s is leaves about 25% of the measurement error hanging out there
to hurt you. If you can talk your customer into doing the same on the
opposite side of the spec, you’ve reduced your odds of him calling
something bad that you’ve called good to almost zero.0March 12, 2008 at 11:44 am #169585I have never heard of the rule, but there is some logic to it.2/3’s is leaves about 25% of the measurement error hanging out there
to hurt you. If you can talk your customer into doing the same on the
opposite side of the spec, you’ve reduced your odds of him calling
something bad that you’ve called good to almost zero.0March 17, 2008 at 12:14 pm #169767Hello, I think you’re talking about Probable Error. PE = 0.675 times your estimate of standard deviation. Dr. Wheeler wrote an article explaining this topic, “Relative Probable Error”.
http://www.spcpress.com/pdf/Relative_Probable_Error.pdf
Hope this helps.0 -
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