BALL MILL. Westpro’s Ball Mills ensure fine grinding of minerals and ore. Our Ball Mills are engineered to provide the most efficient solution for fine finishing. ADVANTAGES. Liners are less expensive than Rod Mill steel liners. Ideal for fine grinding applications. Easy grinding media handling. BM58 (5′ Dia. x 8′ Lg) Ball Mill fully.The over-grinding phenomenon of the grinding process is severe, and the grinding efficiency is also significantly lower however, the overflow ball mill has a simple structure, is inexpensive, and is suitable for fine Grinding equipment, so overflow ball mills are also widely used in production practice.