Before one can answer this question there are a few items that must be examined.

First, what is the condition of the jaws? Jaws typically show higher wear towards the center than the sides. The discharge setting is typically determined by the distance between the stationary and movable jaw, by measuring between the crowns. As the jaws wear down the sides dictate just how closed the stationary can be adjusted to the movable. Therefore, it is not uncommon for a set of jaws to have a discharge setting 2-3 inches greater when it is worn than when it is new.

The second consideration is related to the length of toggle plate. Since most of a crusher’s product size is related to the discharge setting, is there enough adjustment in the crusher to allow one to decrease the close side setting to attain a “finer” product?

If the jaws are relatively new and there is enough adjustment left in the crusher, than one needs to address the gradation with designs. Typically the greater the tooth pitch the coarser the product. If the tooth pitch was 4” and a “finer” product is desired, than a 2” tooth pitch may help.