May 13, 2019· Additionally, jaw crusher feed should be prescreened using a grizzly screen prior to crushing to remove material finer than the closedside setting. Setting jaw crushers. Ideally, the reduction ratio of a jaw crusher should be 6to1. There are different ways to calculate reduction ratio, but the best way is something called the P80 factor.
A jaw or toggle crusher consists of a set of vertical jaws, one jaw is kept stationary and is called a fixed jaw while the other jaw called a swing jaw, moves back and forth relative to it, by a cam or pitman mechanism, acting like a class II lever or a nutcracker. The volume or cavity between the two jaws is called the crushing chamber.