3. Problem No.:01
Calculate the cutting time needed to finish turning a Ø60 mm steel part down to Ø59.6 mm in a
length of 60 mm if a tungsten carbide tool main positioning angle of 45º is used.
The cutting speed is 120 m/min, the cutting depth 0.2mm, the feed per revolution 0.2 mm/rev and
the safety distance 2 mm.
MACHINING TIME
Ans.: TCUTTING = 0.49 min
Problem No.:02
A part of Ø60 mm is aimed to be achieved after making successive rough turning operations
and starting from an aluminium bar of Ø75 mm. The tool is made of High Speed Steel and the
tool main positioning angle is 60º.
If a cutting speed of 40 m/min, a feed per revolution of 0.25 mm/rev, a cutting length of 120 mm
and a cutting depth of 1.5 mm is used, calculate the machining time considering an entry and
exit security distance of 2mm.
Ans.: TCUTTING = 14.71 min
