This paper describes the so-called Nexus method for evaluating geometric dimensioning and tolerancing (GDT) problems. It is specifically designed for position tolerance involving bonus and shift tolerances. The method constructs graphical representations of features termed Nexus cells. The cells contain all geometric information of the features in numerical values. After each feature is represented by a Nexus cell, the cells are linked up to form the Nexus model for the part. Once the model is completed, it can be used to evaluate GDT problems associated with the part. The method is also applicable for assembly. Application examples are presented and results obtained are compared with and verified by the conventional stack form method.
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