Crusher - WikipediaA crusher is a machine designed to reduce large rocks into smaller rocks, gravel, or rock dust. . Querns and mortars are types of these crushing devices. . surface to break or compress materials into small fractional chunks or denser masses.methods of crushing small rocks,Crusher - RitchieWikiNov 19, 2009 . 1.1 Early Crushing Methods; 1.2 The First Crushing Machines . groups of two to four to blast and break rocks, drilling small holes into rock and.
methods of crushing small rocks