1
GATE ME 2013
+2
-0.6
Two cutting tools are being compared for a machining operation. The tool life equations are:
\eqalign{ & \,\,\,\,\,\,\,\,\,\,\,\,Carbi{\mathop{\rm de}\nolimits} \,\,tool:\,\,\,\,\,\,\,\,\,\,\,\,V{T^{1.6}} = 3000 \cr & \,\,\,\,\,\,\,\,\,\,\,\,HSS\,\,tool:\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,V{T^{0.6}} = 200 \cr}

Where $$V$$ is the cutting speed in $$m/min$$ and $$T$$ is the tool life in $$min.$$ The carbide tool will provide higher tool life if the cutting speed in $$m/min$$ exceeds

A
$$15.0$$
B
$$39.4$$
C
$$49.3$$
D
$$60.0$$
2
GATE ME 2013
+2
-0.6
In orthogonal turning of a bar of $$100$$ $$mm$$ diameter with a feed of $$0.25$$ $$min/rev,$$ depth of cut of $$4$$ $$mm$$ and cutting velocity of $$90$$ $$m/min,$$ it is observed that the main (tangential) cutting force is prependicular to the friction force acting at the chip-tool interface. The main (tangential) cutting force is $$1500$$ $$N.$$

The orthogonal rake angle of the cutting tool in degrees is

A
zero
B
$$3.58$$
C
zero
D
$$7.16$$
3
GATE ME 2011
+2
-0.6
A single-point cutting tool with $${12^0}$$ rake angle is used to machine a steel work-piece. The depth of cut, $$i.e$$ uncut thickness is $$0.81$$ $$mm.$$ The chip thickness under orthogonal machining condition is $$1.8$$ $$mm.$$ The shear angle is approximately
A
$${22^0}$$
B
$${26^0}$$
C
$${56^0}$$
D
$${76^0}$$
4
GATE ME 2010
+2
-0.6
For tool $$A,$$ Taylorâ€™s tool life exponent $$(n)$$ is $$0.45$$ and constant $$(K)$$ is $$90.$$ Similarly for tool $$B,$$ $$n=0.3$$ and $$K=60.$$ The cutting speed (in $$m/min$$) above which tool $$A$$ will have a higher tool life than tool $$B$$ is
A
$$26.7$$
B
$$42.5$$
C
$$80.7$$
D
$$142.9$$
GATE ME Subjects
EXAM MAP
Medical
NEET