V.A. Grechishnikov, V.B. Romanov, V.V. Yunusov
A matter concerning drill holes for the processing step, cutting forces acting on the cutting tool. A new design of cutting tools — step drill with a insert for processing multiholes. Cutting tool lets you change in terms of the cutting insert. Cutting tool allows you to receive various forms of stepped holes — screw heads and chamfers. The design allows the cutting tool insert a desired without changing the hole cutting tool.
Keywords: drill, step hole, drilling insert, cutting force..