Accuracy of Large-Pitchscrewthread Manufactured with the Double-Point Lathe Cutting Tool. Kinematic Study

The production of large-step threads, for example for conical drill-string tool-joints locks, is done with the help of lathe cutting-tool. However, a double-thread lathe cutter should be more productive for this purpose. However, such types of tools are not supplied by modern tool manufacturers really. Apparently, it is due to the lack of investigation of the process of the thread profile accuracy ensuring. The article theoretically investigates the phenomenon of longitudinal displacement of the obtained threaded profile, which occurs as a result of kinematic leading and lagging of the opposite flanks profile of the cutting edge. It has been proven that the resulting offset does not actually affect the accuracy of the thread profile.