JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III MACHINE TOOLS Previous Question Paper (March - 2024 - R13)
Note: i) Question paper consists of Part A, Part B. ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions. iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
Part A
List out different types of wear possible in metal cutting.
Answer
The primary types of wear in metal cutting are flank wear, which occurs on the tool flank due to friction with the machined surface, and crater wear, which occurs on the rake face due to the diffusion and adhesion of chips.
Draw the geometry of a single point cutting tool and show the various parts in it.
Answer
A single point cutting tool geometry consists of the following key elements: shank (the main body), base (bottom surface), face (surface over which chips flow), flank (surface adjacent to the cutting edge), nose (the point where side and end cutting edges meet), and the cutting edges (side and end). These are defined by angles including rake angles (back and side), relief angles (end and side), and cutting edge angles (end and side).
Explain the importance of knurling and chamfering operations.
Answer
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Discuss about the classifications of the Lathe.
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Define boring operation.
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List out the operations performed in drilling machine.
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How honing is different from grinding?
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List out different accessories to milling machine.
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List out the applications of grinding machine.
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Define clogging in grinding.
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Part B
Orthogonal turning of a mild steel tube with a tool of rake angle 10° carried out at a feed of 0.14 mm/rev. If the thickness of the chip produced is 0.28 mm, calculate the values of shear angle.
Answer
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Draw the merchant circle diagram and derive the expressions to show relationship among different forces acting on the cutting tool.
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An orthogonal cut 2.5 mm wide is made at speed of 0.5 m/s and feed of 0.26mm with a HSS tool having a 20° rake angle. The chip thickness ratio is found to be 0.58, the cutting force is 1400N and Feed thrust force is 360N Calculate:
a) Chip thickness
b) Shear Plane Angle
c) Resultant force
d) Co-efficient of friction on the face of the tool.
e) Friction force and normal force on the chip.
f) Shearing force and normal force on the shear plane.
Answer
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Draw neat sketch of capstan lathe and list out its parts.
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Explain the difference between three jaw chuck and four jaw chuck.
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Differentiate Single spindle and multi-spindle automatic lathes.
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Sketch a block diagram of a turret lathe. Name its major parts.
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Explain the working principal of slotting and list out the advantages.
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Explain with a neat sketch, jig boring machine.
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Explain with a neat sketch, work holding devices for drilling.
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Differentiate shaping and planning machines.
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Describe the different types of cutters used in milling operations and give an application of each type.
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Explain the broaching process with neat sketch.
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Differentiate lapping and honing process with neat sketch.
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Draw horizontal milling machine and list out its parts.
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Explain with a neat sketch, surface grinding.
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Draw tool and cutter grinding machine and list out its parts.
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Explain with a neat sketch, Centerless grinding machine.
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Explain the classification of grinding machines.
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