Tolerance Stack up Analysis of a Mechanical Assembly

Abstract The importance of Geometrical Dimensioning & Tolerancing (GDT) to the product design is now well understood in the industry. Tolerance stack up analysis is then used to study the conformity of the parts to the tolerance zone. Conventional methods of tolerance stack up analysis for GDT is tedious and time consuming. One needs to acquire an adequate knowledge of GDT before making any attempt at the computation of tolerance stack up analysis problem. Therefore simplification of tolerance stack up analysis methodology is required. This paper presents straightforward, easy to use graphical tolerance stack up analysis method for parallelism type of geometrical tolerance. The user can ignore the various rules involved in computing the tolerances in conventional tolerance stack up analysis. An example of payload assembly is taken for purpose of tolerance stack up of a mechanical assembly.