Special machine is used for processing gearbox so as to fulfill drilling and boring at the same time, thus, effectively guaranteeing the product quality.

变速箱体技术精度要求高，设计了专用机床实现钻、镗孔一次完成，保证了产品质量。

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To solve this problem, The author analyzes the reasons why the errors are generated in turning (boring) and designs the special machine, in which the rotation of part is main moveme.

为了解决这个问题 ，作者分析了车削 （镗削 ）加工台阶孔时 ，误差产生的原因 ； 并设计了车削该台阶孔的专用机床 ：工件的旋转作为主运动 ，两把车刀从两端进给运动 ，分别车削两段台阶孔。

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This paper concisely describes the characteristics of type YXT-1 special milling-boring machine used for depth making marble and granite, and emphatically introduces its design principle.

本文叙述用于大理石、花岗岩板材深度加工的YXT—1石材异形铣镗机的结构特点，并着重介绍该机的设计原则。

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