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                    abstract

                    ¡¡¡¡According to the proposition requirements of "s" type carbon free car in the sixth national engineering capacity competition, a carbon free car is designed to convert the gravitational potential energy into kinetic energy, and the steering mechanism is used to achieve the effect of self winding pile. The steering mechanism is a crank rocker mechanism. In order to realize the adjustable distance between piles, the crank is equipped with threaded holes with different distance between holes. Through the analysis of the processing technology, a special fixture is made to assist the CAM programming, and through the CNC milling machine processing, the processing accuracy and use requirements of the crank are finally met.

                    ¡¡¡¡Keywords: special fixture; CAM programming; processing technology;

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