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This program is part of the Fundamentals of Geometric Dimensioning and Tolerancing (GDandT) package. Datums are reference measurement surfaces planes, or points from which other part features are measured. By using the 14 geometric characteristic symbols along with datum references the functional requirement of a part or assembly can be effectively communicated. The proper identification and usage of datums in GDandT is explored.
This program focuses solely on the form symbols:
By Gary Conner
By George N Bullen FSME