Researches regarding the inner turning of the Polytetrafluoroethylene at small and medium feeds

Experiments were made of the inner cylindrical turning of the Teflon with small and medium feeds, collecting the resulting chips. The shapes and dimensions of these chips are analyzed, explaining their correlation with the advance and with the deformation of the chips sections. The shapes of the chips resulting from considerations of the cutting process of this material are explained. From the analysis of the shapes of the chips, conclusions can be drawn regarding the deformation of the part material in the cutting area, meaning an appreciation of the machinability of the material. The quality of the chip surface indicates the marks left on the chip by the fine chip elements, some of them sticking to the resulting chip. The visualization of the aspect of the machined surface on the piece shows the lack of deposits on the edge, with small exceptions, the uniformity of the channels generated by the tip of the turning tool on the workpiece. All these considerations, as well as the final table regarding the deformation of the chip during processing, show how the Teflon behaves when turning inside with small feeds.