(d) Establishment of a system model Figure 2 Object-oriented system modeling diagram Through the above analysis, the system modeling is shown in Figure 2 (simplified). 4 Conclusion The CAD system that truly realizes the product assembly has great difficulties in theory and in practice; the special CAD system customized for a certain design has become a natural choice for many manufacturers. This article uses a successful design example to illustrate how to model a dedicated CAD system through an object-oriented approach for professionals who are ready to work on a product-specific CAD system design. Previous page 