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GUJARAT TECHNOLOGICAL UNIVERSITY
DIPLOMA ENGINEERING – SEMESTER –VI • EXAMINATION – WINTER 2015
Subject Code: 3361901 Date: 19/12/2015
Subject Name: Computer Aided Manufacturing
Time: 02:30 PM TO 05:00 PM Total Marks: 70
1. Attempt all questions.
2. Make Suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Use of programmable & Communication aids are strictly prohibited.
5. Use of only simple calculator is permitted in Mathematics.
6. English version is authentic
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Q.1 Answer any seven out of ten. 14
1. Write meaning of G02 and G03 codes in CNC part programming.
2. Write meaning of G41 and G42 codes in CNC part programming.
3. Define Work zero and Machine zero.
4. Define Robotics and list main parts of robots.
5. Write two main differences between NC and CNC machines.
6. Write four main advantages of CNC machines
7. List name of different feedback devices used in CNC machines.
8. List name of different motion control system of CNC machines.
9.What are functions of Miscellaneous code (M codes) M03 and M06?
10. Differentiate between incremental and absolute dimensioning.
Q.2 (a) Explain axis designation in lathe machine and vertical milling machine. 03
OR
(a) Explain axis designation in Drilling machine and Planner machine. 03
(b) Write part programme for drilling holes using canned cycle as shown in figure-3. 03
OR
(b) Explain working of Automatic Palate changer (APC) with neat sketch. 03
(c) Write short note on Tool Radius Compensation. 04
OR
(d) Explain canned cycles for drilling with examples. 04
OR
(d) Explain canned cycles for boring with examples. 04
Q.3 (a) List Industrial applications of robots. 03
OR
(a) Classify Robots and Explain any one type in brief. 03
(b) Explain working of Servo motor. 03
OR
(b) List potential benefits of CIM. 03
(c) Define Rapid proto typing and list various Rapid proto typing process. 04
OR
(c) Explain an adaptive control with diagram 04
(d) Write area covered in CIM using block diagram. 04
OR
(d) Explain main elements and their functions of FMS 04
Q.4 (a) Explain macros in part programming with example. 03
OR
(a) Explain subroutine in part programming with example 03
(b) Write short note on DNC with neat sketch. 04
OR
(b) Explain in brief, main four constructional features of CNC machines 04
(c) Prepare CNC part programme for turning using ISO code of a component given in figure 1. 07
Q.5 (a) Prepare CNC part programme for milling using ISO code of a component given in figure 2. 04
(b) Classify CNC machines and briefly explain any one type. 04
(c) Explain construction and working of Re circulating Ball screw 03
(d) Explain working of Automatic tool changer(ATC) with neat sketch 03
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