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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VII(NEW) EXAMINATION - SUMMER 2019
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Subject Code:2182503 Date:09/05/2019Subject Name:Design of Product and Machine Tools
Time:10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
- Design Data book is permitted.
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MARKS
Q.1 (a) Why feed box with gear cone with sliding key is not suitable for 03 heavy duty lathe machine?
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(b) Name the Devices used for intermittent motion. Explain Geneva 04 Mechanism in detail.
(c) Explain various Elementary transmission methods for 07 Transforming rotary motion into Translatory.
Q.2 (a) Discuss various properties of Materials used for sliding contact 03 bearing.
(b) State the functions and requirements of the spindle unit along with 04 the materials.
(c) With neat sketch explain following gear box: 07
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(1) Feed box with tumbler gear (2) Feed box with change gearOR
(c) Design hydrodynamic journal bearing for a shaft of blower for 07 following data:
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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Q.3 (a) Discuss various methods to improve dynamic stiffness of machine 03 tools.
(b) Discuss various types of Bed structure and wall arrangements and 04 their applications with neat sketch.
(c) Explain the design procedure of Slideways for wear resistance. 07
OR
Q.3 (a) Why it is important to adjust the clearance in slide ways? 03
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(b) Write a note on Antifriction Guideways. 04
(c) Give requirement of Protecting devices for slide ways and explain 07 various types of protecting devices with neat sketch.
Q.4 (a) What do you understand by 6 x 37 rope? Explain with neat sketch. 03
(b) How does the design of sheave and pulley differ? 04
(c) Find the diameter of rope required for an overhead travelling crane 07 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*10* N/mm², s,= 1500 N/mm²
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OR
Q.4 (a) Will you prefer a cast hook or forged hook in cranes? Give reason. 03
(b) Draw diagram of material handling system with rope bending 04 diagram for multiple crane pulley having 3 and 6 bends.
(c) Design the crane hook for the lifting capacity of 10 tonnes, having 07 triangular section. Take permissible tensile stress 120 N/mm² for forged steel.
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Q.5 (a) Discuss the role of Aesthetics in Product design. 03
(b) Discuss product design in a viewpoint of: 04
(1) Designer, (2) Customer
(c) Discuss the importance of selection of proper tolerance for part 07 dimensions.
OR
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Q.5 (a) Discuss following in brief: 03
1. Value Engineering 2. Consumer Quality level
(b) Discuss the importance of CAD in developing the products. 04
(c) Comment on the statement "A Design needs sound knowledge of 07 Manufacturing technology and machine tools"
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