What Is a Stone/Rock Crusher?A stone crusher is a machine designed to reduce large rocks into smaller rocks, gravel, or rock dust. Stone crushers may be used to reduce the size, or change the form, of waste materials so they can be more easily disposed of or recycled, or to reduce the size of a solid mix of raw materials (as in rock ore), so that pieces of different composition can be differentiated.In general, there are many types of rock crushers, namely, jaw crusher, impact crusher, cone crusher, hammer crusher, roller crusher for sale, etc.  What Can Stone Crusher Do?In industry, stone crushers or sand machines are machines which use a metal surface to break or compress materials. Mining operations use crushers, commonly classified by the degree to which they fragment the starting material, with primary and secondary crushers handling coarse materials, and tertiary and quaternary crushers reducing ore particles to finer gradations.Each crusher is designed to work with a certain maximum size of raw material, and often delivers its output to a screening machine which sorts and directs the product for further processing.