An overview of the existing designs of a combined tool for processing stepped holes

Modern machine building is going on the way of development and improvement of technological processes in metalworking, therefore at present the main direction is the increase of productivity and flexibility due to the fact that the growth of the nomenclature of processed parts is increasing and there is an urgent need for transition to automated production. This task is solved by wide use of various numerically controlled machine tools, including multi-purpose, aggregate and special machine tools and automatic lines designed on their basis, and flexible production systems. If we consider the increase of automation of the process of obtaining parts from the side of cutting tools, we can say that for automated production design special tool designs that will increase the level of efficiency of high-performance equipment. In this paper, the current basic designs of combination tools for machining step holes are discussed.