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Abstract
This paper deals with tolerance charting for a component with both angular and square shoulder features. First of all, a unified surface model is proposed for a component with both angular and square-shoulder-featured surfaces. Then, a two-dimensional tolerance chart is constructed and parameterized for the machining of the component. Also, two general formulae are derived to calculate the surface changes due to machining cuts. The recording of the surface changes during all machining cuts means that the reverse dimensional chains and the “solid” stock removals can be identified automatically. Finally, the forward dimensional chains are obtained by inverting the reverse dimensional chains. Both the reverse and forward dimensional chains developed in this paper are two-dimensional, with both axial and radial dimensions. The approach presented in this paper is very useful in the development of a computer-aided angular tolerance charting system.
Acknowledgement
This work described in this paper was supported by the Research Grants Council of Hong Kong, China (project PolyU 5142/98E).