Ball milling should pay attention near the center of its cutting small, close to "zero" and therefore cutting conditions are harsh. Therefore, if possible, should be normal to the direction of the axis of the cutter by an inclination angle of the workpiece. According to the test, when the angle is about 15 °, the life of the tool will reach the maximum value.

    Tool overhang on the high-speed machining tool life will have some impact. On the limited results of the test, the mill when 6mm overhang from 30mm to 60mm, the tool life is expected to increase to 140% of the original 230%.

     In the profiling process, the cross-sectional profile along the milling method (also called contour milling) along a longitudinal cross-sectional profile than the milling method (also known as the ramp milling). Because more consistent cutting conditions milling contours, smooth cutting, the workpiece surface roughness is relatively good, but climbing is very unstable cutting conditions milling tool close to the center prone to chipping, the surface roughness of the situation not ideal. While in the case of using climbing milling, experiments show that climb milling tool life than conventional milling, milling tool life up better than down milling.
  
     When the internal cavity milling cutting force changes

     When milling internal cavity, when the tool is fed to the corner cutting corners due to the sudden increase, which would dramatically increase the radial force, the peak will reach about 170 percent of normal cutting values. Therefore, we recommend the implementation of so-called "cycloid cutting" around the corner, so you can avoid a sudden increase cutting force, in order to achieve a smooth cutting and longer tool life.
     In cooling, we should be special attention. Mist cooling (also known as quasi-dry cutting) is ideal, jet cooling, high pressure and large flow internal cooling is also acceptable, but should avoid low pressure, external cooling.