Avoid turning in the areas of weldments, parting lines, and flash. This will tend to extend cutter life. Minimize the number of set ups required. Milling should be grouped into sets of parallel planes. Design for the largest diameter cutters possible.
Larger cutters are less prone to breakage and require lower speeds when compared to smaller cutters.
Larger cutters also can accomodate carbide cutting inserts. Carbide cutting surfaces require fewer tool changes and have higher cutting performance. Blending of radii into existing surfaces should be avoided, even with a ball end mill. Cosmetic-quality blending is expensive to achieve. If a surface is to be faced, it preferably should be angled in order to provide tool clearance.