Compared with horizontal milling machines, the main difference between vertical milling machines and horizontal milling machines is that the spindle is arranged vertically. In addition to the different spindle arrangements, the workbench can be raised and lowered. The milling cutters used in vertical milling machines are relatively flexible and have a wider range of applications. End mills, machine-clamped cutters, drill bits, etc. can be used. It can mill keyways, flat surfaces, boring holes, etc. Horizontal milling machines can also use various cutting tools above, but they are not as convenient as vertical milling. Mainly, hangers can be used to enhance the strength of the cutting tools (mainly three-sided milling cutters, sheet milling cutters, etc.). It can mill slots, mill planes, cut off, etc. Horizontal milling machines generally have an end milling head. Although the function and rigidity of this end milling head are not as powerful as that of a vertical milling machine, it is sufficient to handle end milling processing. This makes horizontal milling machines overall more powerful than vertical milling machines. Vertical milling machines do not have this feature and cannot process workpieces suitable for horizontal milling. Productivity is higher than horizontal milling machines.