In this study, the effects of dry, oil mist and wet cutting methods were investigated in turning wear resistant cemented carbides to achieve a systematic understanding of the machining characteristics of cutting and tool wear in environmentally conscious machining. The turning and orthogonal cutting were carried out using the PCD tool. The main results obtained are as follows: (1) In mist or wet cutting, the tool wear was effectively reduced on the flank where the thickness of the removal stock was large, due to the lubricating property. (2) In mist or wet cutting, the residual stock was increased for the lubricating property. Therefore a removal of grains contained in the cutting tool was suppressed and the tool wear was not severe. (3) The flank angle in the worn tool edge became negative, and the magnitude of that angle increased as the thickness of removal stock became large. In mist or wet cutting, in the tool edge where the thickness of removal stock was small, the magnitude of that angle became smaller than that in dry cutting, resulting in an increase of the tool wear width.
