1
GATE PI 2017
MCQ (Single Correct Answer)
+2
-0.6
A schematic diagram of peripheral milling is shown in the Figure. GATE PI 2017 Machine Tools and Machining - Machining Question 1 English

If $$t$$ is the depth of cut and $$d$$ is the diameter of the milling cutter, then the length of approach $$\left( {la} \right)$$ is expressed as

A
$$\sqrt {d\left( {t - d} \right)} $$
B
$$\sqrt {d\left( {d - t} \right)} $$
C
$$\sqrt {t\left( {d - t} \right)} $$
D
$$\sqrt {t\left( {t - d} \right)} $$
2
GATE PI 2015
Numerical
+2
-0
In drilling operation, a twist-drill of $$30$$ $$mm$$ diameter with point angle of $$118$$ degrees is used. If the $$CNC$$ command issued to execute the drilling operation is $$G90$$ $$G01$$ $$Z??$$ $$F20.$$ The datum is defined on the top surface of the work material and the approach distance is $$3$$ $$mm.$$ Then, to achieve a cylindrical hole depth of $$40$$ $$mm,$$ the $$Z$$ coordinate to be provided in the $$CNC$$ command, in $$mm,$$ is ______________.
Your input ____
3
GATE PI 2015
Numerical
+2
-0
In a slab milling operation, a cutter of $$75$$ $$mm$$ diameter with sufficient width is used to remove $$5$$ $$mm$$ thick material from a $$200$$ $$mm$$ long part in a single pass. The minimum length of travel, in $$mm,$$ for the cutter to engage and completely cut the part surface is ______________.
Your input ____
4
GATE PI 2014
Numerical
+2
-0
An $$HSS$$ drill of $$20mm$$ diameter with $$5mm$$ cone height is used to drill a through hole in a steel work-piece of $$50mm$$ thickness. Cutting speed of $$10m/min$$ and feed rate of $$0.3mm/rev$$ are used. The drilling time, in seconds, neglecting the approach and over travel, is ______________
Your input ____
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