Cubic crystalline boron nitride (cBN) is a highly wear resistant cutting material used for turning and milling of ferrous materials and superalloys. Due to its high hardness, this cutting material can only be mechanically finished with diamond grinding tools. The grinding tool wear is high as a consequence of the high hardness and high temperature hardness of the material. By adjusting the process variables feed rate, cutting speed and oscillation, it is possible to significantly reduce tool wear. The underlying principal mechanisms and derived process parameters are described. The contact length-specific equivalent chip thickness significantly determines the wear mechanism. Further, the kinematic number of grain engagements is influenced by the oscillation frequency. Recommendations for processing of PcBN are deduced.