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After an analysis of power transmission and a comparison of the published pulverization data with estimated power, the following problems were confirmed, unrelated to the coincidentallity of direction between revolution and rotation.1) The theoretical power necessary for pulverization in planetary mills is determined as the product of the frictional force owing to planetary motion μmaN and rp(ω1+ω2) in place of the velocity of pot, in the same manner as coventional ball mills.2) Under even conditions the pulverizing rate is proportional to the theoretical power for pulverization, no matter whether the mill pot revolves or not.

The Necessary Power and Pulverizing Rate in Planetary Mills.