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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%

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