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Calculating Go & NoGo gage tolerances, the 10% rule

Question

Sent: Wednesday, February 09, 2005 9:31 AM
Subject: gaging question

Good morning,
On your web site, I was reviewing the reference document regarding "Fixed
Limit Gages" and the "10% rule"
(http://www.vermontgage.com/tech/Archive/rules.pdf).

I was just curious if there is an industry standard that references the use of the "10% rule" that I could refer to.

Thank you, and best regards,
S.W.

Reply from Vermont Gage Technical Support

S.,

The 10% Rule is a guide line that has been used for years. The, ANSI/ASME
STD B89.7.3.1-2001 "GUIDELINES FOR DECISION RULES: CONSIDERING MEASUREMENT
UNCERTAINTY IN DETERMINING CONFORMANCE TO SPECIFICATIONS", to the 10:1 rule
as well as the 4:1 rule (ANSI Z-540 & MIL-STD 45662A). B89-7.3.1 goes beyond
the these basic rules & gives suggestions of various methods for
manufacturers & their customers to create an accetable inspection for
inspection of product.

Thanks,
tech@vermontgage.com