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Diploma Engineering - SEMESTER–VIII • EXAMINATION – WINTER • 2016
Subject Code: 3361901 Date: 20-10-2016
Subject Name: Computer Aided Manufacturin
Time: 10:30 am - 01:00 pm Total Marks: 70
Instructions:
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. Define CAM and its scope.
2. Write four selection criteria for CNC M/C.
3. What is spindle drive and axis drives on CNC M/C?
4. What are qualified tools in CNC M/C?
5. State tool holder types and its application.
6. Definition of various positions like machine zero, home position, work piece zero
7. State any four G codes with its function.
8. Types of part programming formats used in CAM
9. What is tool radius compensation?
10. State interfacing standards of CAD/CAM
Q.2 (a) State and explain advantages and limitations of CNC M/C. 03
OR
(a) State difference between CNC and DNC. 03
(b) Explain CNC axes and motions nomenclature. 03
OR
(b) Explain feedback devices (transducers, encoders) for CNC M/C. 03
(c) Write short notes on Re-circulating ball screw. 04
OR
(c) State and explain CNC machines Types, classification and working. 04
(d) Explain CNC turning centres. 04
OR
(d) Explain CNC machining centres. 04
Q.3 (a) Write short notes on canned cycles. 03
OR
(a) Write shore notes on APC. 03
(b) Explain importance of Do-LOOP used in CNC part programming. 03
OR
(b) Explain CNC part programming used for CAM. 03
(c) Write CNC part program for turning Fig: 1 using ISO format. 08
OR
(c) Write CNC part program for milling Fig: 2 using ISO format. 08
Q.4 (a) Write short notes on Macro used for part programming. 03
OR
(a) Explain any 3 M codes offenly used in CNC part programming with example. 03
(b) Explain need and importance of various compensations: 04
i. Tool length compensation.ii. Pitch error compensation.
iii. Tool radius compensation. iv. Tool offset.
OR
(b) Explain Flexible Manufacturing System. 04
(c) Write shore notes on subroutines write subroutine part program for fg :3. 07
Q.5 (a) Write short notes on ATC. 04
(b) Explain Adoptive controls used in CAM. 04
(c) Write shore notes on CIM. 03
(d) Write short notes on robotics. 03
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