An Integrated Methodology for Geometric Tolerance Analysis and Value Specification Based on Arithmetical, Graphical and Analytical Methods

Abstract

With respect to Geometrical Tolerances Analysis and Value Specification, no standard approach is available. Generally, design engineers physically conduct the analysis manually or by using an automated method. Hence, design of Geometrical Tolerances largely depends on the designer’s judgment and experience. In such a case, a true integrated functional tolerance specification is not guaranteed. Also, upon specification of geometrical tolerance values, they have to be checked for coherence, completeness, and feasibility of assembly in order to avoid rejections and reworks at the stage of assembly. In this paper, an integrated methodology is suggested for value specification and for checking the coherence and completeness of Position, Symmetry, and Perpendicularity tolerances based on distribution of minimum allowance. A selected mechanical assembly is used as a case study to verify the suggested methods.