Geometric Dimensioning and Tolerancing - 1946 to 1982. The Differences in theStandards

摘要

An analysis is made of the meaning of the symbolically representedcharacteristics defined in certain dimensioning and tolerancing standards, authorized for use by the Department of Defense and the U.S. Army in the preparation of engineering drawings. The analysis is based on a comparison of the defined meaning in each of these standards as it relates to the defined meaning in the most current standard. The results show that the meaning and the associated tolerance has, in some cases, changed significantly as the standards evolved. These differences are identified and described. (AN).