Of course, it has been known grinding at relatively high feed rates to get a good surface finish, but hard turning with PCBN inserts can be significantly higher metal removal rates get equal or better surface finish. Although the process has a small depth of cut small feed composition, for reducing conventional hard time turning estimated as high as 60%, and for the latest insert car (plunge turning) technology up to 90%.

      Studies have shown that by using the correct corner radius, feed rate or the new wiper blade technology portfolio, hard turning can get better than grinding surface finish. In fact, than grinding hard turning can be adjusted simply mounted lettering knife station - under Russia (foreign) card is completed with high accuracy can be obtained. However, there are still a lot of car parts around hard surface integrity comprehensive debate.

      Hard turning by residual stress pattern and also known as the white layer of the surface area of strong to affect the surface microstructure. These thin, then hardened layer is usually white layer immediately following excessive tempering area. Back due to the transformation of the microstructure of the material, and then hardening layer under an optical microscope to see it is white, and tempering zone showed dark.

      Studies have confirmed the presence of the white layer in hard turning and grinding surfaces are. Although they are usually associated surface residual tensile stress, but also may indicate whitening layer of residual compressive stress. Anyway, it causes whitening layer and they are not all understand the workpiece.