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GUJARAT TECHNOLOGICAL UNIVERSITY
DIPLOMA ENGINEERING – SEMESTER–VI• EXAMINATION – SUMMER 2015
Subject Code:3361901 Date:30-04 - 2015
Subject Name: Computer Aided Manufacturing (CAM)
Time: 10:30am to 1:00pm 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 any two differences between NC and CNC machine.
2. Define CAM and write any two applications of CAM.
3. Draw the block diagram showing components for NC machine.
4.Draw the block diagram of open loop control system.
5. Write any two advantages and disadvantages of CIM system.
6. Write full form of IGES, PHIGS, MCU, and SLA.
7. Explain the ISO part programming code “M03” with suitable example.
8. Draw the block diagram of CIM system.
9. Define subroutine and write its two features.
10. Define the robotics terminology “ Pitch” & “Yaw”.
Q.2 (a) Write any six main technical specifications for the selection of CNC machine. 03
OR
(a) Explain “DNC” system with block diagram in brief. 03
(b) Write any three advantages and disadvantages of CNC machine tool. 03
OR
(b) Explain “point to point” motion control system used in CNC machine with line diagram. 03
(c) Draw the neat sketch of ATC & write its four advantages. 04
OR
(c) Draw the neat sketch of APC& explain in brief. 04
(d) Draw the neat sketch of “re-circulating screw & nut“ & explain in brief. 04
OR
(d) Describe qualified tool used in CNC machine with neat sketch. 04
Q.3 (a) Define HMC, VMC & UMC in reference with CNC machine. 03
OR
(a) Draw and explain close loop control system used in CNC machine. 03
(b) Draw and explain any one work holding device used in CNC machining center. 03
OR
(b) Draw and explain any one work holding device used in CNC turning center. 03
(c) Write name of two types of tool holding devices used in CNC machining center & explain any one with neat sketch. 04
(d) Explain axis nomenclature used in CNC turning center with neat sketch. 04
OR
(d) Explain axis nomenclature used in CNC machining center with neat sketch. 04
Q.4 (a) Define adoptive control system & write its four applications. 03
OR
(a) Define FMS. Draw its block diagram & write its two applications. 03
(b) Define robot, draw the sketch showing key components of robot & write two applications of robot. 04
OR
(b) Define rapid prototyping and write its four techniques and two applications. 04
(c) Prepare the CNC part program using G and M codes with ISO format for the given fig-1of milling contour with circular interpolation. 07
Q.5 (a) Prepare the CNC turning part program using G and M codes with ISO format for the given Fig-2 with circular interpolation. 07
(b) Write a CNC subroutine program to milled three(3) square pocket of 20X20mm for the given squareplatefigure-3. 04
(c) Define and explain Modal and non-modal command used in CNC. 03
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