Roll Crusher - 911 MetallurgistMar 30, 2018 . The crushing action of roll crushers on rock is completely by compression. Learn how to size, feed, maintain and operate a small roll crusher.rolls crusher rock,Rolls Crusher| Eriez Lab EquipmentMACSALAB Rolls Crusher size '0' and '1' are designed for secondary reduction after jaw crushing. These smooth roll crushers will rapidly reduce coal, ore and hard rock from maximum feed size of 20mm to fine sand. Rugged construction, easy to operate, each roll has its own separate drive. Smooth finish and fluted rolls.