Jaw crushers use compressive force to break up particles. This mechanical pressure is achieved by the crusher's two jaws, one of which is fixed while the other reciprocates. A jaw crusher or toggle crusher consists of a set of vertical jaws, one of which remains stationary, called the fixed jaw, and the other, called the swinging jaw, which is relative to it by a cam or linkage mechanism Moving back and forth, acts like a Class II lever or nutcracker. The volume or cavity between the two jaws is called the crushing chamber. The movement of the swinging jaws can be very small, since complete crushing is not done in one go. The inertia required for crushing the material is provided by the flywheel. The moving shaft produces eccentric motion, resulting in the closing of the gap.