It allows complex assemblies to be fully defined, including electronic sub-assemblies that might be integral to the product. Components are fully engineered in detail ready for production. A full manufacturing specification is produced including 2D component/assembly drawings along with a full Bill of Materials.
3D CAD allows us to undertake some fundamental analysis of components, including FEA (finite element analysis), clearance and interference checks and draft analysis to ensure components are suitable for manufacture. Mechanisms can be modelled and animated to analyse moving components too.