The higher the hardness of workpiece material, cutting speed should be smaller. Superhard tools using hard turning finishing suitable cutting speed range of 80 ~ 200m / min, commonly in the range of 10 ~ 150m / min; using a large cutting depth or heavy interrupted cutting of high hardness materials, cutting speed should be maintained at 80 ~ 100m / min. In general, the depth of cut is between 0.1 ~ 0.3mm.

Low surface roughness of the workpiece, the optional small depth of cut, but not too small, to be appropriate. Feed rate can usually choose between 0.05 ~ 0.25mm / r, depending on the specific surface roughness value and productivity requirements. When the surface roughness ra = 0.3 ~ when 0.66μm, using super-hard cutting tools for hard turning with grinding much more than economic.

In addition to selecting a reasonable tool, the use of super-hard cutting tools for hard turning no special requirements on the lathe or turning center lathe or turning center if sufficient rigidity, and can get the required accuracy and surface roughness when machining soft parts, namely Suitable for hard cutting. In order to ensure smooth and continuous, commonly used method is to use rigid clamping device and tool rake angle medium turning operations. If the workpiece in the cutting force its positioning, supporting and rotation may remain fairly steady state, existing equipment can superhard tools using hard turning.