According to China nuclear energy development report 2019, the share of nuclear power in China's power generation will rise from 4.22% in 2018 to about 10% in 2035; including the nuclear island's internals, control rod drive mechanism, steam generator, pressure vessel, pressurizer, nuclear main pump, turbine, and generator of the conventional island, all need precision machining of machine tools, especially super heavy automatic tool change CNC machine Bed, take an important position in this industry. The machine is equipped with a drum-type tool magazine which can hold 40 tools and can automatically replace large tools weighing up to 120 kg. The productions of the electric motor need various specifications of CNC vertical lathe, gear hobbing machine, and punch.