求翻译：本文主要是针对数控镗铣床的主轴变速机构机械部分的设计，设计的内容主要有机床变速机构的主要参数的确定，传动方案和传动系统图的拟定，对传动系统进行了设计以及对相关零部件的校核。是什么意思？

This article is intended for the design of the mechanical parts of the CNC milling machine spindle speed change mechanism, designed mainly determine the main parameters of the machine speed change mechanism, the transmission scheme and the formulation of the transmission system diagram, the drive sy

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This article mainly is aims at the numerical control boring milling machine the main axle gearshift mechanism machine part design, the design content mainly has the engine bed gearshift mechanism main parameter determination, the transmission plan and kinematic scheme sketch, has carried on the desi