A milling cutter is used for slotting and machining precision external components on a milling machine. Many things in our daily lives can be manufactured through milling processes. If these milling tools are not used, producing those things is very costly, and producing something with only a few dollars may cost hundreds or even thousands of dollars. A milling machine is a widely used machine tool that can process flat surfaces (horizontal and vertical surfaces), grooves (keyways, T-grooves, dovetail grooves, etc.), toothed parts (gears, spline shafts, sprockets, helical surfaces (threads, spiral grooves), and various curved surfaces. In addition, it can also be used for machining the surface and inner holes of rotating bodies, as well as for cutting work. When the milling machine is working, the workpiece is installed on the workbench or indexing head and other accessories. The milling cutter rotates as the main motion, supplemented by the feed motion of the workbench or milling head, and the workpiece can obtain the required machining surface. Due to intermittent cutting with multiple cutters, the productivity of milling machines is higher The correct selection and use of end mills is crucial for the entire machining process. The materials and design styles of end mills are diverse and should be selected appropriately based on specific operations. In addition, the tool can also have a variety of external coating layers to extend tool life, reduce operating temperature, and play a cooling role. The tool must be firmly fixed on the tool holder, which is very important. If it is not firmly fixed, it will worsen and unstable the cutting effect. The best fixing method is to install the tool on a tool holder with the same center as it.