1
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
$${76^0}$$
2
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
$$142.9$$
3
GATE ME 2009
+2
-0.6
In a machining experiment, tool life was found to vary with the cutting speed in the following manner

The exponent $$(n)$$ and constant $$(K)$$ of the Taylor's tool life equation are

A
$$n=0.5,$$ and $$K=540$$
B
$$n=1.0,$$ and $$K=4860$$
C
$$n=-1.0,$$ and $$K=0.74$$
D
$$n=-0.5,$$ and $$K=1.155$$
4
GATE ME 2009
+2
-0.6
In a machining experiment, tool life was found to vary with the cutting speed in the following manner

What is percentage increase in tool life when the cutting speed is halved.

A
$$50\%$$
B
$$200\%$$
C
$$300\%$$
D
$$400\%$$
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