Abstract
Although the function of Auto CAD is powerful, its professional pertinence is weak, and partuicularly it cannot satisfy the requirement for the efficient drawing and annotation of the common mechanical structure. The author of this paper has a discussion on the development principle and methods of a 2D General Mechanical CAD System (MACD). Faced up with all the requirements of the mechanical designing 2D drawing, and on the basis of the overall extracting the special features of the mechanical structure 2D primitives, the designing habits and the designing standards and specifications, all the function points of the system have been set up through the intersection and integration of the Auto CAD working mode and the functions of the system. A mechanical CAD system with a general drawing fucntion has been complished with a comprehensive use of the tools of the Auto CAD like function expansion, menu customization and programme development. Applied practice shows that this system has satisfied all the requirements for the mechanical desginers to make the drawings, annotations, enquiry for the standard data, the structure enquiry and quotations so that the designing efficiency has been greatly increased.
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