The mechanical characteristics of the gantry structure bed are that it is made of HT300 gray iron castings and strictly follows the processing technology of two thermal aging and one high-grade aging to ensure the stability of the casting material, achieve outstanding rigidity, stability accuracy, and unparalleled dynamic response. The XYZ linear axis is based on the movement of the base bed, without any worktable or workpiece load, and without the influence of cutting operation environment, ensuring low load during XYZ axis movement operation, achieving high rigidity and stability. The AC axis turntable is fixed on the support base bed to avoid accuracy errors caused by the movement of the AC axis, ensuring the accuracy of the rotation center during five axis linkage. All models in the series adopt dual A-axis and dual DD direct drive rotary tables, and the AC axis is equipped with Heidenhain grating, achieving higher load-bearing capacity and longer precision life. The spindle adopts HSK series high-precision and high torque electric spindle. Effectively control the thermal elongation of the spindle to ensure better accuracy errors caused by thermal deformation of the Z-axis of the machine tool.