1
GATE ME 1999
+2
-0.6
What is the approximate $$\%$$ change in the life, $$t,$$ of the tool with zero rake angle used in orthogonal cutting when its clearance angle, $$\alpha ,$$ is changed from $$10$$ to $$7$$ deg?

(Hint: flank wear rate is proportional to $$\cot \,\alpha$$)

A
$$30\%$$ increase
B
$$30\%$$ decrease
C
$$70\%$$ increase
D
$$70\%$$ decrease
2
GATE ME 1998
+2
-0.6
In orthogonal machining operation, the chip thickness and the uncut chip thickness are equal to $$0.45mm$$. If the tool rake angle is $$0$$ deg. The shear plane angle is
A
$$45$$
B
$$30$$
C
$$18$$
D
$$60$$
3
GATE ME 1997
+2
-0.6
In a typical metal cutting operation, using a cutting tool of positive rake $$\gamma = 10\deg ,$$ it was observed that the shear angle was $$20deg$$. The friction angle is
A
$$45$$
B
$$30$$
C
$$60$$
D
$$40$$
4
GATE ME 1997
+2
-0.6
A cutting tool has a nose radius of $$1.8mm$$. The feed rate for a theoretical surface roughness of $${R_t} = 5$$ microns is
A
$$0.268$$ $$mm/rev$$
B
$$0.187$$ $$mm/rev$$
C
$$0.036$$ $$mm/rev$$
D
$$0.0187$$ $$mm/rev$$
GATE ME Subjects
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Medical
NEET