目前在三轴两两联动的立式数控铣床中，实现Z轴加工的方法有两种，其一是工作台的升降运动；其二是铣头的上下运动。两种方法可以说各有千秋，因为工作台有一定重量，所以第一种方法的关键在于提高力矩，使得加工顺滑并且持久。首先看看实现工作台运动的过程（见图1）。其中C、 Currently in the three-axis two-linked vertical CNC milling machine to achieve Z-axis machining methods are two, one is the lifting table movements; the second is the milling head up and down movement. The two methods can be said to have their own advantages, because the table has a certain weight, so the first method is the key to improve the torque, making the process smooth and lasting. First look at the process of achieving table movement (see Figure 1). Which C,