Undercutting End Mills. Undercutting End Mills (Spherical Lollipop-Style). Improve surface finish in all of your undercutting , deburring, and multi-axis machining applications with our Undercutting End Mills. Available in 220°, 270°, 270° High Helix, and 300° with multiple neck lengths and hard-to-find cutter diameters, these.
Feb 14, 2009 . If anyone wants to know the actual optimal speed needs to read the book on theory of ball mills by L. Sponenburgh. Very informative and he takes you through how to make the best affordable ball mill possible, with milling times of 40 minutes to make airfloat charcoal whereas with other ball mills this would.