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The article offers a method for temperature measurement in the cutting zone on a turning lathe. Application of thermal imager BALTECH TR-01500 allowed one to record the thermogramm of the cutter running out from the cutting zone at the moment of releasing the cutter face from chips. The values of the coefficients of thermal emissivity of the cutter and chips were recorded in the memory of the thermal imager. The article presents the conclusion of dependence of difference of mechanical characteristics of the machining material and the material of the cutter on heating temperature and the determination of the optimal temperature of cutting. There is a description of the method of temperature measurement and a photo of installation, also there is a frameby-frame thermogramm of the cutter running out from the cutting zone and temperature changing of the external surface of the chip and the cutter face. The calculation of error of measurement of temperature of the cutter face was presented.