The use of a combined tool for the machining of holes

Abstract

The article presents the dependences of the total axial cutting force and torque obtained during
the processing of holes by stepped drills with parallel operation of the steps, the dependences between
the step diameters of the combined axial tool are proposed and the preference of the combined axial tool
before the usual multistage holes in the details that are used in hydraulic systems. The dependences
between the influence of the diameters of the stages, feed, the diameter of the first stage on the axial
force and the torque during machining by the combined axial tool are derived. As practice has shown in
the processing of a multistage tool, the diameter of the second stage is important.