The Y2726-type double cradle straight bevel gear mil ing machine is widely used at home and abroad. The straight bevel gear is cut to barrel-type teeth by gear generating motion method. To avoid the change and adjustment of the transmission system at cutting different gears, this paper presents an innovation project that four servo motors are used to drive rotation of two cradles and two work piece heads with computer numerical control technology. Most transmission chains are removed. The gear cutting is fin-ished by interpolation of two servo motors control ed by CNC system. The producing efficiency is improved over 50% and the preci-sion of manufactured gear is reached to 7 classes.%Y2726型双头直齿圆锥齿轮铣齿机采用展成法加工鼓形直齿圆锥齿轮，在国内外广泛应用。为了在加工不同齿轮时避免更换挂轮和调整传动系统，对机床进行了数控化改造设计。采用四个伺服电机分别驱动两个摇台和两个工件头，去除了大多数机械传动链。两个工作头加工齿轮的展成运动，分别通过两个伺服电机的插补运动完成，可依次连续完成大、小轮的粗、精铣齿加工。机床加工效率提高50%，齿轮加工精度达到了7级。
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