Stone Crusher 

By applying and releasing pressure in opposite directions, material is crushed between a stationary and a gyrating plate. The final product is then tiny enough to squeeze through the opening. A gyratory crusher's main component is a solid cone mounted on an eccentric shaft, which rotates inside a conical or vertically sloping hollow body. When two crushing surfaces get close enough to each other, the material between them is crushed, and the resulting particles are discharged through a lower hole. Hammer mills can be used as a primary crusher, which does not require any more crushing, or as a secondary crusher for the material that has already been crushed. They find extensive usage in a variety of applications requiring the crushing of heavy metal scrap.

Stone crushing is a major industry in India, contributing an estimated Rs. 5000 crore to the country's GDP each year. For the enterprising businessperson, setting up a stone crushing factory might yield substantial financial rewards. Stone crusher capacity is a key factor in determining the overall project cost. They are expressed in tons per hour (TPH), with a 150 TPH facility costing roughly $1.5 million dollars. This plant would use oil and grease type crushers, which have a cheap operating cost and can be operated by a smaller team of less-experienced workers. Two tipper trucks can transport materials from the mines to the Hopper, while a 20-ton excavator and a JCB-style loader round out the machinery. It would cost 1.5 billion for this piece of equipment.