Generally, there are 4 knives or 6 knives on the cutter head. The motor drives the rotor to rotate, so that the cutter disc rotates to achieve the function of cutting materials. After the cutter cuts the material into chips and enters the crushing room, the hammer is continuously beaten to crush the raw materials into sawdust. The smaller diameter wood chips are discharged through the screen, and the larger diameter wood chips are left to be crushed in the crushing chamber until the desired effect is achieved.