were the most common choice crushers, but in recent years impact crushers are more widely used. These crushers also are sometimes used as primary crushers for finegrained gravel deposits. The cone crusher (a compression type) simply crushes the aggregate between the oscillating cone and the crusher wa ll (Figure 59). Clearance settings on
The Standard and NonClog Industrial Hammermills are designed to reduce the material to a nominal 3" to 5" (75mm to 25mm) output. These are primary stage crushers, commonly followed with Centerfeed Mills or other types of secondary stage crushers. The HammerMaster is also a secondary stage crusher in that the maximum feed size is 6" (150mm).