Title: A 'circuitry' approach to tolerance charting

Authors: B.K.A. Ngoi, Y.P Lee

Addresses: School of Mechanical and Production Engineering, Nanyang Technological University, Singapore. ' School of Mechanical and Production Engineering, Nanyang Technological University, Singapore

Abstract: The most critical step in a tolerance chart is to determine the various unknown working dimensions and their corresponding tolerances that are related to a particular blueprint dimension. The required algorithm in doing so in manual tolerance charting is both tedious and time-consuming. This paper presents a simple path tracing model that is used to achieve the above-mentioned. From this model, the unknown working dimensions and their corresponding blueprint dimensions are reduced to a set of linear equations. All the working dimensions can be easily solved by employing the Gauss elimination technique. Next, the tolerances are balanced using a separate mathematical model. As a result, the complete system is capable of solving all the unknown working dimensions involved in a machining process and obtaining their respective optimised tolerances.

Keywords: tolerance balancing; tolerance charts; tolerance optimisation; mathematical modelling; path tracing model; tolerances; tolerancing; Gaussian elimination; working dimensions.

DOI: 10.1504/IJCAT.1998.062178

International Journal of Computer Applications in Technology, 1998 Vol.11 No.1/2, pp.1 - 10

Published online: 01 Jun 2014 *

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