The Who and the History of Geometric Dimensioning & Tolerancing

Apr 13, 2020

The Beginning:  What we now call Geometric Dimensioning & Tolerancing, or "GD&T" started near the beginning of World War II.  Stanley Parker developed the concept of "True Position" and also, reportedly the first use of round tolerance zones for round holes while he worked in a torpedo factory in Scotland.  He realized that parts that had been rejected based on measurement results were actually functional, so as developed tolerancing practices to  more effectively address functional requirements of mechanical parts, he was credited with creating the first elements of GD&T.

Development of GD&T Standards:  GD&T standards started as military standards, such as US Army 30-1-7, dated April 15th, 1946, and then Mil-Std-8, dated December 30th, 1949, then the ASME (American Society of Mechanical Engineers) was the publisher for ASA (American Standards Association) Y14.5-1957.  Subsequent Y14.5 standards have been released as USASI (United...

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