Crushers are used to crush crumbly materials. Stones have different reactions during crushing. Therefore, depending on the type of stone and application, different crushers are needed. Each crusher has a special method for crushing which is divided into two main parts: A. Compression crushing (primary gyratory crushers, jaw crushers and cone crushers) In this method, the material is compressed between two surfaces that are close to each other. And as a result are crushed. The speed of movement of the crushing surface varies between 0.5 to 1.5 meters per second.In this method, the material is affected by the shock caused by the impact of the rotating parts (rotor and breaker, hammer, crusher, sand bed, etc.) and is thrown to metal surfaces (anvils) or non-metal surfaces (sand bed) and They are hit and in this movement, the stones also collide with each other. The speed of movement is usually 30 to 80 meters per minute and sometimes higher in VSI‌s.