Chapter 18. Feed Milling Processes - FAOHammermills are mostly impact grinders with swinging or stationary steel bars forcing ingredients against a circular screen or solid serrated section designated as a striking plate (Figure 1). Material is held in the grinding chamber until it is reduced to the size of the openings in the screen. The number of hammers on a.why do we choke feed crushers canada,Maxtrak 1150 | Powerscreen CanadaMaxtrak 1150 | WE DO IT ALL. . The Powerscreen® 1150 Maxtrak is a high performance, medium sized track mobile cone crusher. At the heart of . A level probe over the feed ring regulates the feed belt to ensure the cone chamber is choke fed, essential for maximum reduction, manganese life & op- timal product shape.