1
GATE PI 1989
Subjective
+5
-0
Calculate the tonnage capacity of the broaching machine required to broach on the hole under the following conditions.
Diameter of the finished hole $$=75mm,$$
rise per tooth $$=0.03mm$$
Tooth pitch $$=10mm,$$
Length of the broach $$=750mm$$
Cutting speed $$=6m/min,$$
specific cutting pressure $$= 1300 \times {t^{0.4}}\,\,N/m{m^2},$$ (Where $$t$$ is the uncut chip thickness)
If the tool and work handling time is $$0.5min,$$ estimate the production rate per hour
2
GATE PI 1989
Subjective
+5
-0
The results of machining steel with $$2$$ grades of tool material are given below. For a $$180$$ $$min.$$ Tool life which tool is recommended and why?

If the tool regrinding and changing time is $$15min,$$ the cutting speed for tool $$A$$ $$ahs$$ to be chosen ($$40m/min$$ or $$50m/min$$)

3
GATE PI 1989
MCQ (Single Correct Answer)
+1
-0.3
Abrasives are not used in
A
Buffing process
B
Burnishing process
C
Polishing process
D
Super finishing process
4
GATE PI 1989
MCQ (Single Correct Answer)
+1
-0.3
In turning operation the surface finish can be improved by decreasing
A
Cutting speed
B
Feed per revolution
C
Rake angle
D
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