In the manufacture of various CNC machine tools and other machinery, CNC milling cutters and other devices are widely used. In recent years, with the advancement of CNC 

technology and the general improvement of automation, the production and application of machining center machine tools, CNC lathes, and CNC milling machines have 

become increasingly widespread, and the demand for high-precision and high-efficiency CNC milling cutters has also increased.

As manufacturers continue to launch products with stronger functions and higher efficiency, the manufacture of milling machines has become more and more complex and 

difficult. In addition to having complex contours and tighter tolerances, milling machines are usually made of high-performance materials, which provides the required 

strength and reliability, but also has an adverse effect on machinability. As a common tool for machining planes, steps, grooves, forming surfaces, and cutting off workpieces 

on milling machines, milling cutters have a rotating tool with one or more teeth, and each tooth cuts off the workpiece's excess intermittently in turn during operation.

In the process of milling machine processing with a milling cutter, if you want to maximize the efficiency of processing, the correct choice of the number of milling cutter 

teeth is very important. For example, a sparse-tooth milling cutter with a diameter of 100mm has only 6 teeth, while a dense-tooth milling cutter with a diameter of 100mm 

can have 8 teeth. The density of the teeth will affect the production efficiency and product quality. If the teeth are dense, the production efficiency will be improved and the 

quality of the workpiece will be better, but dense teeth will also make it inconvenient to discharge the chips. According to the diameter of the teeth, they can be divided into 

sparse teeth, fine teeth, and dense teeth.

Sparse teeth are used for rough processing of workpieces. For every 25.4mm diameter, 1-1.5 blades are used, and the chip space is large. This kind of tool is used for cutting 

soft materials that can produce continuous chips. Long blades and large widths are selected. Dense teeth are conducive to processing under stable conditions. They are 

generally used for rough processing of cast iron. They are also suitable for shallow cutting, narrow cutting, and cutting of high-temperature alloys when no chip space is 

required. Dense teeth are used for fine milling. The axial cutting depth is 0.25-0.64mm. The cutting load per tooth is small and the required power is not large, such as for 

processing thin-walled materials. The size of the tooth pitch will determine the number of teeth involved in cutting at the same time during milling. At least one blade should 

be cutting during cutting to avoid milling impact, which will cause damage to the tool and overload the machine tool.

In addition, the number of blade teeth must be selected so that the chips are properly curled and easily leave the cutting area. Improper chip holding space will cause chip 

stagnation, damage to the blade and possibly damage the workpiece. At the same time, the blade should have sufficient density to ensure that at least one blade is cutting 

at any time during cutting. If this cannot be guaranteed, it will cause severe impact, which will lead to blade breakage, tool damage and overload of the machine tool.