T4240坐标镗床采用精密丝杆定位机构,保证纵横向坐标的位移误差<0.005mm。工作原理结构见图1,工作台(或主轴箱)的移动由丝杆2、螺母1实现,移动量由刻度盘4及游标尺3读出。由于丝杆2为6级精度,不能保证位移精度,因此备有校正尺5(此尺装在工作台下面),其有面之曲线是按丝杆的螺距误差放大 T4240 coordinate boring machine with precision screw positioning mechanism, to ensure vertical and horizontal coordinates of the displacement error <0.005mm. The working principle of the structure shown in Figure 1, table (or headstock) movement by the screw 2, nut 1 to achieve the amount of movement by dial 4 and vernier 3 read out. As the screw 2 is 6-level accuracy, can not guarantee the displacement accuracy, so with a calibration scale 5 (this scale installed in the table below), the surface of the curve is based on the screw pitch error amplification