### Technical How To Spec A Mill Gear

A “theoretical critical speed of rotation (cs).” the critical speed of rotation is the speed (in rpm) at which an infinite-ly small particle will cling to the inside of the liners of the mill for a complete revolution. (1) cs = 43.305 √mill diameter where cs is the theoretical critical speed of rotation, and is the mill speed, rpm; mill.Aug 03, for more precise expression for critical rotation speed, (13) n c = 1 2π g r sin θ c 1−α is given. the difference of definitions on the critical rotation speed is as follows: in our definition, when the outermost layer of the ball forms a ring, critical rotation speed is.