Ball Mill Gear - Mineral Processing / Metallurgy - 911 MetallurgistOct 22, 2016 . Two general classifications of gearing are used for ball Mill drives. . The pinion is cut from a steel forging bored, keyseated and mounted on.ball mill pinion,CR4 - Thread: Ball Mill Girth Gear and Pinion AlignmentBall Mill Girth Gear and Pinion Alignment. 08/25/2011 4:15 PM. Can someone explain how to perform a pinion & girth gear alignment? Register to Reply.