Our factory is a professional manufacturer of Dongfeng BM021A freight three-wheeled motorcycle engine. There is a kind of finger in the parts machined in our workshop, which needs to be milled at both ends (Figure 1). Originally, we used two three-sided milling cutters with a diameter of φ125mm to simultaneously mill both ends of the finger on the X62W horizontal milling machine. The following problems occur in the processing: 1 Due to the large amount of processing on both ends of the finger blank, the tool wears quickly, and the phenomenon of "knife" often occurs. 2 Due to the rigidity of the two-edge milling cutter, the rigidity is not enough, often