A stone mill can't empty things. Can things be broken?

Traditional stone mill is different from modern stone mill. The traditional chip stone mill dry grinding will cause pressure damage to the stone mill and destroy it. Therefore, the stone mill is not empty, and the mill can be broken.

Stone mill is a machine used to process rice, wheat, beans and other grains into powder and pulp. It began to use human or animal power, and in the Jin Dynasty, the working people in China invented the waterwheel powered by water. Usually made of two round stones. The grinding surface is two layers flat, and the junction of the two layers is textured. Particles enter the middle of the two layers from the upper hole, move outward along the grain, and are ground to form powder when rolling through the two layers.