PARTICLE SIZE REDUCTION TECHNIQUES - SlideShare - Watermill - Wikipedia
Salimon et al. used their planetary ball mill at a rotation speed of 1235 rpm corresponding to the mill energy intensity of 50 W/g. It has been reported that some of these mills can be used at rotation speeds greater than 2000 rpm.The geared mill of the Middle Ages was actually a general mechanism for the utilization of power. The power from a horse- or cattle-powered mill was small compared to that from overshot water-wheels,
