Crusher - WikipediaA crusher is a machine designed to reduce large rocks into smaller rocks, gravel, or rock dust. ... For the most part advances in crusher design have moved slowly. Jaw crushers have remained virtually unchanged for sixty years. More reliability.mining crusher diagrams,Crushers and Equipment Technology in Mining | Crushers .The jaw crusher reduces the size by the compression force when the rock is pressed . The principal design parameters that drive crushing plant selection and.