Geometric Model of NC12 Tool-Joint Thread Turning with a Double-Point Tool

3D geometric modelling of thread turning processes is an important tool for studying the accuracy of the obtained screw surface. This is especially relevant in relation to the responsible drill-string tool-joints, the manufacture of which requires significant productivity. A study of the effect of high-performance double-edged cutters on the accuracy of one of the technologically most complex NC12 tool-joint threads proved the absolute suitability of the double-pointcutting insert for these purposes. The work also carried out 2D geometric modelling of the process of forming this thread, which, together with the algorithm for profiling tool-joint threads previously developed by the authors, actually confirmed the correlation of the results of the accuracy analysis of the profile obtained with the help of the developed models and the specified algorithm.