Parts of similar shape but not identical in size are often encountered in the manufacturing industry, such as bolts and nuts, keys, pins, springs, and serialized product parts in common standard parts. The two-dimensional design of these parts is now relatively mature. However, with the development of CAD/CAM, the design and manufacture of products have a new idea, that is, the design steps from three-dimensional to two-dimensional, that is, the first to be built
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