In modern mechanical products, the accuracy calculation of machinery is the judgment standard of the integrity of the whole mechanical design. Computer aided precision design of mechanical parts is an important part of the whole mechanical design. The overall design will affect the performance and quality of the product, and also has an important impact on the manufacturing cost of the product. Computer aided precision design of mechanical parts has become one of the core technologies of CAD and cam, and has become a key link affecting the integration of design and manufacturing information. Through the research on the automatic generation technology of dimension chain, the CAD prototype system can be developed on the basis of AutoCAD<br>
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