You can think about this in terms of crushing zones. The height of a crushing zone is the distance a particle will fall during one revolution, so a chamber with a high eccentric throw will have fewer crushing zones – particles will fall further in one revolution. Thus, having a higher eccentric throw will deliver a coarser product, since it will have been crushed fewer times in it’s descent through the chamber.
The eccentric throw also defines a second parameter – the capacity of your crusher. A higher eccentric throw means fewer crushing zones, so the journey through the crusher is quicker. The quicker the journey through the crusher, the greater its capacity. Therefore, altering the eccentric throw settings significantly changes the way your crusher works – without making any adjustments to the concave. If you increase the eccentric throw, you can increase capacity. If you decrease the eccentric throw, your output will be less coarse.
Coarse output often has to be re-circulated, costing you time and money. Getting the right eccentric throw is about balancing these two factors – capacity and output gradation – to reach the most efficient overall outcome.