GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- VII (New) EXAMINATION — WINTER 2019
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Subject Code: 2171903 Date: 03/12/2019
Subject Name: Computer Aided Manufacturing
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.
- Abbreviations have usual meaning.
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Q.1 (a) Give three points each on advantages and disadvantages of CAM. 03
(b) Draw the CIM wheel to understand basic functions. 04
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(c) Explain closed-loop control system used in a CNC system with a schematic diagram (include its limitation and application). Draw a block diagram of position control loop for a closed-loop control system. 07
Q.2 (a) What is meant by the term ‘group technology’? 03
(b) Brief about ‘continuous path control’ used in a CNC machine tool system. 04
(c) Explain the ‘stick-slip phenomenon’ encountered in conventional friction guideways. How is it overcome with the use of anti-friction guideways? 07
OR
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(c) Write an NC part program for drilling three holes in the plate shown in Figure 1. Work material is a machinable grade of aluminum 10-mm thick. Specify the cutting tool and describe your procedure for this task. Feed and cutting speed for the work material are 0.05 mm/rev and 0.37 m/sec respectively. Show interpretation of each block you write in a remark column. 07
Q.3 (a) Enlist the four major components an FMS is comprised of. What is the role of humans in it? 03
(b) Why are various layout types in FMS made available to choose from? 04 Enlist the types and draw schematic diagram of any one layout.
(c) Write a note on: Automated Storage and Retrieval System (AS/RS). 07
OR
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Q.3 (a) Define PLC. Brief about the relay device components used in it. 03
Q.4 (a) Explain generative type CAPP system using a block diagram. 07
(b) In which two categories the actuation systems employed for robots can be distinguished? State the application area or environment in which each of these could be used. 03
(c) Enlist the general characteristics of a work-situation which promotes the use of robots. 04
OR
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Q.4 (a) Describe the methods for programming robots. What are the advantages of each method? 07
(b) Explain the PLC architecture using a diagram. 03
(c) Brief about ‘cellular manufacturing’. 04
Q.5 (a) Provide a comprehensive list of robot specifications with regard to (a) manipulator and (b) controller. 07
(b) What do you understand by MRP-II? What does the acronym ERP stand for? 03
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(c) Draw the structure of an MRP system. 04
OR
Q.5 (a) Write a note on: Different types of flexibility required in an FMS. 07
(b) In block number 80 of a part program a clockwise circular interpolation is required to the target point (25.40, 12.50, --10.00) with feed rate 150 mm/min and spindle on. Write this block in fixed sequential format, tab sequential format and word address format. (Coordinates are in millimeters) 03
(c) Explain with reference to CNC machining: tool nose-radius compensation is a must for taper- and radius-turning, whereas it is not required while turning straight cylindrical surface. 04
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(c) Elaborate the ‘Just in Time’ manufacturing philosophy along with its goals. How could these goals be achieved? 07
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