Conditions regarding heat generation in the process of cutting are of vital importance for better understanding of the activity going on in the deformation area of a tool. There are 2 sources of heat in this deformation area, namely internal friction arising from a deformational process of a material, and the friction emerging between a chip, workpiece and tool. Duringthe machining pof organic materials, the portion of internal friction ispractically negligible. That means that entire heat emerging in the deformation area of the tool represents a result of the friction between a chip, workpiece and tool. The influence of technological and material parameters on heat generation in a process of turning was surveyed. The temperature of the tool was measured by a thermocouple set under the cutting insert. The measurements were carried out at different feed rates, depths of cut and moisture contents. The research was carried out at continuous and intermitted turning. The results of the analyses show that the increase in feed rate and depth of cut cause increase in heat generation and temperature. Under all circumstances, humidity of the workpiece negatively influences heat generation. In the case of intermitted turning, lower tool temperature was noticed, as a result of decrease in heat generation. The results show that heat is in a direct correlation with the magnitude of the cutting force.