The main parameters of the original gantry machining center CNC system include: the size of the gantry machining center CNC system table is 2300 mm × 1100mm, the bearing power in the gantry machining center CNC system is 15/17kW, and the spindle rotation in the gantry machining center CNC system The speed is 20-3600 r/min, and the maximum capacity of the tool magazine in the CNC system of the gantry machining center is 32 tools. The requirements for the transformation of the CNC system of the gantry machining center are as follows: One is to ensure the three-axis linkage of the CNC system of the gantry machining center, or the linkage of any two bearings. The second is that the smallest unit of the system is 1um. Third, the corresponding speed requirements of the CNC system of the gantry machining center are relatively high. Fourth, the spindle speed of the CNC system of the gantry machining center should be maintained at 10~6 100 r/min, and the power should be maintained at 15/19kW. Fifth, tool change must be convenient and quick.