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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VIII (OLD) EXAMINATION — WINTER 2018
Subject Code: 182503 Date: 19/11/2018
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Subject Name: Design Of Product And Machine Tools
Time: 02:30 PM TO 05:00 PM Total Marks: 70
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Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Discuss general requirements of machine tool design. 07
(b) Explain various Elementary transmission methods for Transforming rotary motion into Translatory. 07
Q.2 (a) With neat sketch explain following gear box: 07
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(1) Feed box with tumbler gear (2) Feed box with change gear
(b) State the functions and requirements of the spindle unit along with the materials. 07
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OR
(b) Discuss various types of Bed structure and wall arrangements and their applications with neat sketch. 07
Q.3 (a) Design hydrodynamic journal bearing for a shaft of blower for following data: 07
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Bearing Load due to belt force: 3000N, Bearing Load due to weight of rotor: 600N, Speed of Blower: 600 rpm, diameter of shaft: 50 mm, Expected temperature of Oil:70°, ambient temperature: 30°, c/d ratio - 0.0015, Minimum film thickness: 0.019 mm
Calculate: actual attitude, type of oil used, power loss, heat generated, actual minimum film thickness.
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(b) State advantages and Disadvantages of hydrodynamic and hydrostatic bearings. Discuss where each one is more suitable. 07
OR
Q.3 (a) Design hydrodynamic journal bearing for lathe spindle from following data: 07
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Load on spindle: 20kN; Speed of Spindle: 2000 rpm, diameter of spindle at journal: 100 mm, l/d = 2, Clearance ratio: 2*10-3, viscosity of oil at working temperature = 35*10-3 kg/m.s
Calculate: bearing characteristic number.
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(b) Explain the importance of lubrication of ball and roller bearing. Illustrate few methods of carrying out proper lubrication for specific application. 07
Q.4 (a) Explain the design procedure of Slideways for wear resistance. 07
(b) Give requirement of Protecting devices for slide ways and explain various types of protecting devices with neat sketch. 07
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OR
Q.4 (a) Discuss various shapes of slide ways and justify their application for machine tools. 07
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(b) Find the diameter of rope required for an overhead travelling crane with lifting magnet. Take, Lifting capacity: 5000 kg, Weight lifting magnet = 2000 kg, weight lifting tackle = 120 kg, Lifting height = 8 meters, No of Rope parts = 4 Take Dmin/d = 23, dw=0.045, E=8*104 N/mm2, st= 1500 N/mm2 07
Q.5 (a) A Gantry crane has a capacity of 8 tons. Design a suitable section. Take permissible tensile stress 110 N/mm2 for forged steel. 07
(b) Discuss the economic criteria that are important in Evaluative product design. 07
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OR
(b) Explain Computer assisted design and Robotics in Product design. 07
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(b) Discuss the importance of CAD in developing the products. 07
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