Uses of a ball mill liner The role of a ball mill liner is to give the mill heads protection against wear and tear thus increasing their lifetime and creating optimal grinding efficiency. The design of a ball mill liner depends on the drilling pattern of the mill heads, the rpm speed of the mill, the maximum grinding diameter of the media and the percentage of media filling. Ball mills operations and maintenance seminar. Learn how to optimise your ball mill systems in this 5-day training seminar focused on best practices for operations and maintenance (preventive and reactive) to achieve energy savings, reduced maintenance costs and overall improved productivity of the ball mill systems. Length of vials up to 21/4 in. (57.2 mm). Push-button, resettable 30-minute timer on the 5100-115 Mixer/Mill. Push-button, resettable 72-minute timer on the 5100-230 Mixer/Mill. Reduces samples to analytical fineness and commonly used to blend samples with KBr for IR analysis. Shock mounted motor enables bench top operation.