4800 rpm. The spindle speed of the universal pulverizer is 4800 rpm. The speed of some professional pulverizers is higher. It depends on the specific operating diameter of the pulverizer rotor. If it is type 40, the rotor operating diameter is 400 mm, and the linear speed of the hammer is the highest. It cannot exceed 110 meters per second, then the rotation speed of the crusher should be 110 divided by (0.4 times 3.14) times 60 which equals 5254 rpm.