Tolerance Model Version 2 for the PDES, Inc., Configuration Item Tolerance Model

摘要

Dimensions on an engineering drawing define the theoretically exact shape of a three-dimensional object. Tolerances on those dimensions define the allowable deviation of the dimension from the nominal value as measured on the manufactured object. ANSI Y14.5M 1982 and ISO 1101 and 1660 specify the standard representation for dimensions and tolerances on engineering drawings. The reference model captures the semantic content of the dimensions and tolerances as specified in those standards as applied to three-dimensional geometric models.