JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III Year II Semester MACHINE TOOL DESIGN Previous Question Paper (July - 2023 - R16)
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
Explain the translatory hydraulic drive mechanism with a simple sketch.
Answer
Explain any two mechanical transmissions for transforming rotary motion to translator motion.
Answer
- Lead Screw and Nut: Converts rotary motion of a screw into linear motion of a nut. It is widely used in lathes for precise feed movements.
- Rack and Pinion: A rotating pinion gear meshes with a stationary rack, converting the rotational speed and torque into linear displacement. It is commonly used in drilling machines and planers.
Write the procedure for design of a feed gear box.
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Mention the various laws of stepped regulation.
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Explain the design for strength approach in the design of machine tool structure.
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What are the design requirements of machine tool structures?
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Write a short note on materials used for slide ways.
Answer
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Explain the design procedure in spindle design.
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Differentiate static stiffness and dynamic stiffness machine tool system.
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Explain the general procedure for assessing dynamic stability of EES-cutting process closed loop system.
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Part B
Explain the working and auxiliary motions in machine tools.
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A 10-teeth face milling cutter of diameter 125 mm machines a flat surface of length L= 200 mm and width B= 100 mm at a speed of 80 m/min and feed of 0.15 mm/tooth. Calculate the machining time, assuming an approach and over travel of 5 mm together.
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Discuss the working of pressure control valve, direction control valve and throttle with neat sketch.
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What are the Technical and economical prerequisites for undertaking the design of a new machine tool?
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What are the design considerations taken while designing the feed box?
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Write the classification of speed gear box in detail.
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What are the general recommendations for developing the gearing diagram?
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Design the feedbox of a lathe machine for the feed range 0.054-4.0mm/rev. Given φ=1.41. Assume a suitable kinematic train between the spindle and the input shaft of the feed box and between the output shaft of the feed box and the rack, attached to the underside of the lathe bed.
Answer
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A speed box having nmin= 20 rpm, nmax= 2000 rpm and φ= 1.26 is to be designed. Draw the best possible structural diagram and speed chart if the speed box has i) a structure with overlapping steps, ii) a structure with broken geometrical progression, and iii) a combined structure.
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Write the basic design procedure of machine tool structures.
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Write the criteria for design of beds.
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Write the model technique in design of machine tool structures.
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Explain the various types of anti-friction ways.
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Write the applications of shapes of slide ways.
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Explain the design criteria and calculations for slide ways.
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From amongst the slide way combinations flat-flat, flat-V and V-V of lathe, which one would provide for the least radial deflection? Substantiate your conclusion with mathematical proof.
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Design for dynamic stiffness.
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Acceptance tests for lathe machine tool.
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Explain the dynamic characteristics of elements and systems.
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Write the experimental determination of the Dynamic characteristic of equivalent elastic system.
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