This project aims at the machining technology and fixture design of the right crankcase of gn250 motorcycle engine, According to the structural characteristics and use requirements of the right crankcase parts, through the combination of theory and practice, the analysis of the right crankcase part drawing and the understanding of the mechanism of the motorcycle engine are carried out, so as to carry out the corresponding calculation, and the selection of the main machining process, process analysis, technical requirements and positioning benchmark are given. Then the right crankcase boring processing and fixture design error analysis, the correct choice of machining methods, in order to achieve a reasonable trial of resources.<br>
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