The influence of a combined instrument’ sgeometrical parameters at a torque size at threading

The article describes the difficulties associated with the processing of steels and alloys with special physical and mechanical properties, including the cutting of high-quality internal threads of small diameters in the details of ship machines and fittings. This has set a task to develop the best tool for cutting of threaded holes. The proposed combined countersink-tap tool, which ensures high quality of threaded holesprocessing, corresponds to modern requirements. The authors have made laboratory studies in order to optimize the combined instrument and order its geometrical parameters. It allows optimizing and stabilizing the effect of torque, and enhancing the stability of threading.