1
GATE PI 2008
+2
-0.6
In an orthogonal cutting experiment, an $$HSS$$ tool having the following tool signature in the orthogonal reference system $$(ORS)$$ has been used: $$0-10-7-7-10-75-1$$
Given : Width of cut $$=3.6mm;$$
Shear strength of work piece material $$460N/m{m^2};$$
Depth of cut $$=0.25mm;$$
Coefficient of friction at chip tool interface $$=0.7.$$

Shear plane angle (in degrees) for minimum cutting force is

A
$$20.5$$
B
$$24.5$$
C
$$28.6$$
D
$$32.5$$
2
GATE PI 2008
+2
-0.6
In an orthogonal cutting experiment, an $$HSS$$ tool having the following tool signature in the orthogonal reference system $$(ORS)$$ has been used: $$0-10-7-7-10-75-1$$
Given : Width of cut $$=3.6mm;$$
Shear strength of work piece material $$460N/m{m^2};$$
Depth of cut $$=0.25mm;$$
Coefficient of friction at chip tool interface $$=0.7.$$

Minimum Power requirement (in $$KW$$) at a cutting speed of $$150m/min$$ is

A
$$2.6$$
B
$$3.25$$
C
$$3.35$$
D
$$3.45$$
3
GATE PI 2008
+2
-0.6
Brittle materials are machined with tools having zero or negative rake angles because it
A
Results in lower cutting force
B
Improves surface finish
C
Provides adequate strength to cutting forces
D
Results in more accurate dimensions
4
GATE PI 2008
+2
-0.6
During machining, the wear land $$(h)$$ has been plotted against machining time $$(T)$$ as given in the following figure.

For a critical wear land of $$1.8mm,$$ the cutting tool life (in $$min$$) is

A
$$52.00$$
B
$$51.67$$
C
$$51.50$$
D
$$50.00$$
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