Feed Material in its dry form is fed into the input chute of the crusher constructed along the width of the drums. Crushing in smooth roll crusher takes place by both sledging and impact action. The drums which are run at an optimal speed and at opposite directions are mounted on heavy duty bearing capable of effectively handling the load. Moreover, the roll assembly is housed inside a heavy fabricated steel body which also comprises of a wear-resistant plates attached to the input chute.

The material is fed at a uniform rate along the total width of the drums. The nip angle is the important parameter here for the crushing to take place. The nip angle of the feed material is further dependent on the coefficient of internal friction of the material which is essential for the material to pass through the drums and get crushed.

Hence, when ultra-fine M-sand of very fine grade is required, the setting (gap between the two drums) is to be made as small as possible up to 2mm.  One of the two drums is fixed whereas the another one is floating. The floating drum is attached to a spring which moved front and back and gives necessary cushion when oversize material passes through the drums.

Once the material passes, its size is reduced to approximately 85% of the setting.