How does a hammer mill work?

The grinding principle of a hammer mill works on the basis of impact. The product is hit by hammers rotating at high speed in the grinding chamber. The hammers are mounted freely suspended on shafts and are directed outwards by centrifugal force during rotation. The first impact between hammer and product crushes the product. Then the product collides with fixed "crushing" plates in the grinding chamber and is further reduced. Perforated plates are positioned on the periphery. As soon as the product has been sufficiently reduced, it leaves the perforated plates. As long as the product has not been sufficiently reduced, the process is repeated until it can leave the perforated plates.