背吃刀量（切削深度）指：垂直于进给速度方向的切削层最大尺寸。
背吃刀量对温度影响最大，铣刀转速次之，进给速度影响最小。
The effect of milling depth is the biggest, next is milling speed, and the minimal is advancing speed.
而采用单片机误差补偿系统可以对背吃刀量进行补偿，提高加工精度。
But adopt the single chip microcomputer error compensating system and can compensation back engagement, raising fabrication accuracy.
如果公称切削速度处于该稳定区域，即使背吃刀量较大，系统也不易发生颤振。
Even if the date of back cutting depth is bigger in the parts of cutting velocity, the cutting system's chatter vibration might not be happened.
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