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For finer crushing or reduction a cone crusher the the norm are commonly used for secondary tertiary or quaternary crushing They do this by a different chamber design which is flatter and by operating at about twice the rotational speed of a primary type gyratory crusher One of the first cone crushers had a direct drive vertical motor mounted above the spider with the drive
A crusher is a machine designed to reduce large rocks into smaller rocks gravel or rock dust 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