Titanium alloys not only have high physical and mechanical properties, in addition, they are the most suitable materials for medical use among metal biomaterials. The machinability of titanium alloys depends on the phase and chemical composition, microstructure parameters and selected cutting conditions. Titanium alloy Grade 5 is used for research, its properties are as close as possible to the analogue of medical titanium alloy. Therefore, it is experimentally determined the surface roughness dependence of the implant on the angular velocity of cutting and feeding tool. The results obtained on the optimal processing conditions for the main and auxiliary movements from Grade 5 titanium alloy are similar for a medical alloy and the basis for choosing the exact processing modes in order to ensure the required surface roughness. The upgraded implant with a double thread provides an increase in translational linear displacement for a full revolution. Rational modes for finishing and double-threading of titanium alloys are defined, and preliminary recommendations on accuracy control for processing difficult titanium implants are proposed. Experimental studies were carried out on a numerically controlled lathe and a vertically milling machine. A technological process has been developed for the manufacture of an implant for the hip tibia using a modified design of double-thread.