1
GATE ME 2003
MCQ (Single Correct Answer)
+5
-1.5
A cylinder is turned on a lathe with orthogonal machining principle. Spindle rotates at $$200rpm$$. The axial feed rate is $$0.25$$ $$mm$$ per revolution. Depth of cut is $$0.4mm.$$ The rake angle is $${10^ \circ }.$$ In the analysis it is found that the shear angle is $${27.75^ \circ },$$

The thickness of the produced chip is

A
$$0.511$$ $$mm$$
B
$$0.528$$ $$mm$$
C
$$0.818$$ $$mm$$
D
$$0.846$$ $$mm$$
2
GATE ME 2003
MCQ (Single Correct Answer)
+5
-1.5
A cylinder is turned on a lathe with orthogonal machining principle. Spindle rotates at $$200rpm$$. The axial feed rate is $$0.25$$ $$mm$$ per revolution. Depth of cut is $$0.4mm.$$ The rake angle is $${10^ \circ }.$$ In the analysis it is found that the shear angle is $${27.75^ \circ },$$

In the above problem, the coefficient of friction at the chip tool interface obtained using Earnest and Merchant theory is

A
$$0.18$$
B
$$0.36$$
C
$$0.71$$
D
$$0.98$$
3
GATE ME 2002
Subjective
+5
-0
A tube of $$32mm$$ outside diameter was turned on a lathe and the following data was obtained
Rake angle $$=35deg,$$
Feed rate $$=0.1mm/rev$$
Cutting force $$=2000N,$$
Cutting speed $$=15m/min$$
Length of continuous chip is one revolution $$=60mm$$

Feed force $$=800N.$$ Calculate the chip thickness, shear plane angle, velocity of chip along tool face and coefficient of friction.

4
GATE ME 2001
MCQ (Single Correct Answer)
+5
-1.5
Tool life testing on a lathe under dry cutting conditions gave $$'n'$$ and $$'C'$$ of Taylor tool life equation as $$0.12$$ and $$130$$ $$m/min,$$ respectively. When a coolant was used, $$'C'$$ increased by $$10\% $$. The increased tool life with the use of coolant at a cutting speed of $$90$$ $$m/min$$ is
A
$$47.4min$$
B
$$37.4min$$
C
$$27.4min$$
D
$$17.4min$$
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