Crushing is the process of applying an amplified force to a material to break it down into smaller pieces. A crusher is a machine designed to crush large chunks of material into smaller bits or a powder. They are used to reduce mineral rocks to smaller rocks, gravel, or dust. They are also used to reduce the size of waste materials for easier disposal/recycling or to reduce the size of a solid mix of raw materials. Crusher equipment selection depends on the physical properties of the material to be processed, the in-feed size, and the desired output particle size.