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These are machines mainly designed for the second and third class crushing of aggregate in accordance with the graded fractions to be acquired. Various types of grinders exist: cylinders, hammers, balls and bars, amongst others. The first ones' fractioning is produced between two horizontally fitted rollers that rotate in opposite directions. The second ones have a runner which has hammers on its arms that continually hit the material until it reaches the end size. The bars and balls are so called as these elements move with the aggregate in a rotary drum and they crush it by consecutive impacts.