Planetary ball mill is the common used ball mills in labs for grinding soft to hard, brittle samples.
The jars placed on the planetary disk rotates reverse around the center of disk. Because of this working, samples are crushed by the impact, shear and friction force caused by ball to ball and ball to the jar wall.
With the planetary movement, the jars inside is not only affected by gravity, like the conventional ball mill, but also the centrifugal and coriolis force further increase the kinetic energy of the grinding part. At the high speed movement, these forces on the grinding parts and the samples produce great load intensity and grinding performance.