4. System Devices (12 Hrs) Actuators, Transducers and Sensors, Tachometer, LVDT, opto-interrupters, potentiometers for linear and angular position, encoder and decoder, axis drives, open loop system, close loop system. 5. Problems in CNC Machines (04 Hrs) Common problems in mechanical, electrical, pneumatic, electronic and PC components of NC machines, diagnostic study of common problems and remedies, use of on-time fault finding diagnosis tools in CNC machines.
149 6. Automation and NC system (06 Hrs) Role of computer in automation, emerging trends in automation, automatic assembly, manufacture of magnetic tape, manufacture of printed circuit boards, manufacture of integrated Circuits, Overview of FMS, Group technology, CAD/CAM and CIM. LIST OF PRACTICALS 1 Study the constructional details of CNC lathe. 2. Study the constructional details of CNC milling machine. 3. Study the constructional details and working of: - Automatic tool changer and tool setter - Multiple pallets - Swarf removal - Safety devices 4. Develop a part programme for following lathe operations and make the job on CNC lathe and CNC turning center. - Plain turning and facing operations - Taper turning operations - Operation along contour using circular interpolation. 5. Develop a part programme for the following milling operations and make the job on CNC milling - Plain milling - Slot milling - Contouring - Pocket milling 6. Preparation of work instruction for machine operator 7. Preparation of preventive maintenance schedule for CNC machine. 8. Demonstration through industrial visit for awareness of actual working of FMS in production. 9. Use of software for turning operations on CNC turning center. 10. Use of software for milling operations on machine centres.
150 INSTRUCTIONAL STRATEGY This is highly practice-based course. Efforts should be made to develop programming skills amongst the students. During practice work, it should be ensured that students get opportunity to individually perform practical tasks. RECOMMENDED BOOKS 1. CNC Machines – Programming and Applications by M Adithan and BS Pabla; New Age International (P) Ltd., Delhi. 2. Computer Aided Manufacturing by Rao, Kundra and Tiwari; Tata Mc Graw Hill, New Delhi. 3. CNC Machine by Bharaj; Satya Publications, New Delhi. 4. CNC Machine & Automation by Ramandeep Singh; Eagle Prakashan, Jalandhar SUGGESTED DISTRIBUTION OF MARKS Topic No. Time Allotted (Hrs) Marks Allotted (%) 1 10 20 2 08 16 3 08 16 4 12 26 5 04 10 6 06 12 Total 48 100
151 6.6 PROJECT WORK L T P - - 12 RATIONALE The practical training cum project work is intended to place students for project oriented practical training in actual work situations for the stipulated period with a view to: i) Develop understanding regarding the size and scale of operations and nature of field work in which students are going to play their role after completing the courses of study.
- One '19
- The Land, Milling machine, Numerical control