Dec 13, 2020 · Last Updated on Sun, 13 Dec 2020 | Powder Metallurgy. Milling in an attrition mill(Fig. 24) is effected by the stirring action of an agitator that has a vertical rotating shaft with horizontal arms. This motion causes a differential movement between the balls and the material being milled, thus providing a substantially higher degree of surface contact than is achieved in tumbler or vibratory mills
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