THE NODED GRAPH APPROACH TO STACK ANALYSIS

The tolerance chart is a graphical method for representing the manufac turing dimensions of a workpiece or assembly, at all stages of its man ufacture. The chart provides an inter-mediate control system of checks and balances to ensure that processing dimensions and tolerances will meet those specified on the print. Tolerance charts are generally use d in studying the dimensional problems on individual parts. However, t hey have proved tedious in their application to assemblies. This paper presents a simple and systematic approach to the process of tolerance stack analysis. The ''Noded graph'' model is constructed, representin g the given and the unknown dimensions. Links are then established, us ing the model, which help to formulate the stack path of interest into a linear equation. The equation is used to complete the tolerance sta ck analysis module. This will be explained using a variety of geometri c dimensioning and tolerancing examples. In addition, it is simple and hence easy to practise and very logical.