This manuscript studied several schemes of the installation of natural thermocouples on the metal cutting process in measuring the thermo EMF generated during metal cutting. Absolute and relative measurement errors of thermocouples were analyzed in three diverse installation methods. The contact end of the natural thermocouples on the machined workpiece was installed using a needle, wheel, and brush which are the most popular methods of measuring temperature in machining experiments. Analytical analysis of the experimental results shows that the most accurate method of installment is a brush-contacted thermocouple with 0.18 mV and 2% absolute and relative errors respectively. Indicating the highest absolute and relative errors 1.62 mV and 165% respectively, the wheel contact method showed the most inaccurate results. Moreover, the influence of the cutting speed on the variability of the data in the measurement of thermo EMF in the cutting zone was analyzed. Experimental studies were conducted on the three different cutting speeds while feed rate and cutting depth remained constant in turning cylindrical part. It is concluded that the increase in the cutting speed can cause the improvement of the thermo EMF in the dry turning process.