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GATE 2019: Manufacturing Quiz 7- Numericals

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Question 1

The time taken to face a work piece of 72 mm diameter,if spindle speed is 80 rpm and cross feed is 0.3 mm/rev, is __________.

Question 2

During orthogonal machining with a cutting tool having rake angle 10 ° and the cutting ratio 0.38. The shear plane angle will be _________ degrees.

Question 3

During pure orthogonal turning operation of a hollow cylindrical pipe, it is found that the thickness of the chip produced is 0.5 mm. The feed given to the zero degree rake angle tool is 0.2 mm/rev. The shear strain produced during the operation is ____

Question 4

In an orthogonal machining operation:
Uncut thickness = 0.5 mm, Cutting speed = 20 m/min
Width of cut = 5 mm, Chip thickness = 0.7 mm
Thrust force = 200 N Cutting force = 1200 N
Rake angle = 15 °
Assume Merchant’s theory. The values of shear angle and shear strain, respectively, are ____________.

Question 5

A low carbon steel bar of 147 mm diameter with a length of 630 mm is being turned with uncoated carbide insert. The observed tool lives are 24 min and 12 min for cutting velocities of 90 m/min and 120 m/min respectively. The feed and depth of cut are 0.2 mm/rev and 2 mm respectively. Use the unmachined diameter to calculate the cutting velocity.
When tool life is 20 min, the cutting velocity in m/min is

Question 6

A low carbon steel bar of 147 mm diameter with a length of 630 mm is being turned with uncoated carbide insert. The observed tool lives are 24 min and 12 min for cutting velocities of 90 m/min and 120 m/min respectively. The feed and depth of cut are 0.2 mm/rev and 2 mm respectively. Use the unmachined diameter to calculate the cutting velocity.
Neglect over–travel or approach of the tool. When tool life is 20 min, the machining time in min for a single pass is
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