Universal milling machine is a high rigidity and high power multifunctional metal cutting machine tool, which is capable of milling flat surfaces, beveled surfaces, grooves and so on through the use of different types of milling cutters (such as bar, round and angle milling cutters). Equipped with milling machine accessories such as universal milling head, round table, indexing head, etc., the machining capacity of the machine can be significantly extended, including the machining of spiral surfaces. Universal milling machines are suitable for mold making, special steel processing, mining equipment, heavy machinery and other large-scale machining fields, capable of high-speed and heavy-duty cutting work, and their three-way feed system usually adopts trapezoidal screw or ball screw to ensure machining accuracy and efficiency.