Abstract
There are several motivations for linking together design-evaluation applications and Cad systems — the avoidance of tedious and error-prone reentry of data is just one. The paper examines the motives for linking a widely used design-for-assembly (DFA) evaluation methodology with cad. The DFA methodology is described, and the interrogations of product data that it requires are explored. The extensions to an existing solid-modelling system that are necessary to support these interrogations are considered, with particular reference to the representation of assemblies and assembly processes. An outline is given of how the component properties used by DFA are computed, and the role of geometric reasoning in this.
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