The material that was used for the experimental
researches is the carbon steel C45E. This steel
belongs to the group of construction steels
which are used for essential parts in the
machines and constructions. Workpiece is cold‐
rolled steel bar with a diameter of 120 mm and
length of 300 mm. Research was performed on
universal lathe BOEHRINGER with the following
properties: 8 kW of power, maximum spindle
speed of 2240 rev/min, and feed of 1.6 mm/rev.
Carbide cutting tool for semi machining SNMG
1204 08 NMX was used. Tool clearance angle was
10°, rake angle 0°, and a tool tip radius was 0.8
mm without chip breakers. Tool holder was PSDN
2525 M12 with inclination angle 45° (Fig. 4)