### Planetary Ball Mill PM 400 - RETSCH - powerful and quick grinding

Planetary Ball Mills are used wherever the highest degree of fineness is required. The PM 400 is a robust model with 4 grinding stations. Read more.

### Planetary Ball Mill PM 400 - RETSCH - powerful and quick grinding

Planetary Ball Mills are used wherever the highest degree of fineness is required. The PM 400 is a robust model with 4 grinding stations. Read more.

### Ball mill - Wikipedia

Less wear takes place in rubber lined mills. The length of the mill is approximately equal to its diameter. The general idea behind the ball mill is an ancient one, but it was not until the industrial revolution and the invention of steam power that an effective ball milling machine could be built. It is reported to have been used for ...