Common Data for Questions 14, 15 & 16
In an Orthogonal cutting operation
Uncut chip thickness – 0.5mm
Cutting speed = 20m/min
Width of cut = 5mm
Chip thickness = 0.7mm
Thrust force = 200N
Cutting force = 1200N
Assume merchants theory
The values of shear angle and shear strain, respectively are
(a) 30.0 and 1.98 (b) 30.3 and 4.23
(c) 40.2 and 2.97 (d) 40.2 and 1.65
The coefficient of friction at the tool chip interface is
(a) 0.23 (b) 0.46
(c) 0.85 (d) 0.95
The percentage of total energy dissipated due to friction at the tool chip interfaces is
(a) 30% (b) 42%
(c) 58% (d) 70%