Elements of metal cutting, Machine tools, gear cutting and CNC machining

By Prof. Asimava Roy Choudhury   |   IIT Kharagpur
Learners enrolled: 1635
In the course metal cutting and machine tools, gear cutting and CNC machine tools and processes,the students will be made familiar with metal cutting theory including cutting tool geometry, mechanism of chip formation, force analysis in the orthogonal cutting system, measurement of cutting forces – dynamometers. Theory of tool wear and tool life, Study of different machine tools: Lathe and Milling machine. Study of gear cutting on milling machine, gear shaping and gear Hobbing machines. Study of non-traditional machining : LBM, EDM, ECM, USM, AJM, AWJM Study of CNC machining.

Study of Gear cutting : Introduction to gears, Different types of gears. Simple gear calculations involving numbers of teeth, rpm etc.Gear cutting on the milling machine with rotary disc type form gear milling cutter : Spur and Helical gear cutting with simple and differential indexing, calculation of change gear ratio Gear cutting on the gear shaper – calculation of speed gear box, feed gear box, index gear box ratios Gear cutting on the gear hobbing machine (both straight spur and helical gears) – calculation of speed gear box, feed gear box, index gear box and lead change gear box.

Computer numerical control : Introduction, Classification: Point to point and continuous control, open loop and closed loop control.Kinematic structure of CNC machine tools, different types of prime movers used, feedback devices Digital logic and use of digital logic in CNC machines Interpolation in CNC machines: Linear and circular interpolation Programming in CNC machine - programming on the CNC turning centre and machining centre CNC Free form surface machining with ball ended milling cutter on 3 axis machining centre – basic concepts

INTENDED AUDIENCE: Undergraduate or postgraduate students of mechanical engineering, manufacturing engg, production engg, diploma and certificate students of mechanical trade


Course Status : Ongoing
Course Type : Core
Duration : 12 weeks
Start Date : 26 Jul 2021
End Date : 15 Oct 2021
Exam Date : 23 Oct 2021 IST
Enrollment Ends : 09 Aug 2021
Category :
  • Mechanical Engineering
Credit Points : 3
Level : Undergraduate/Postgraduate

Course layout

Week 1: Introduction to metal cutting: Tool geometry
Week 2: Tool geometry, Mechanism of chip formation, orthogonal cutting, forces in metal cutting (orthogonal cutting)
Week 3: Theory of tool wear, machine tools : Lathe and milling machines
Week 4: Lathe and milling machines contd., Gear cutting machines, Non-traditional machining, CNC machining
Week 5: Introduction to gears, simples calculations involving gears
Week 6: Milling of gears, simple and differential indexing
Week 7: Helical gear cutting, gear teeth calculations
Week 8: Gear Shaping and Gear hobbing
Week 9: CNC – basic principals, classification, binary logic
Week 10: Features and devices of CNC machines, prime movers, feedback devices, programming
Week 11: Programming and Interpolation
Week 12: CNC Free form surface machining

Books and references

1) https://nptel.ac.in/courses/112/105/112105127/
2) Mathematical elements in Computer graphics – Rogers and Adams
3) Computer control of manufacturing systems – Yoram Koren
4) Principals of machine tools - Sen and Bhattacharya
5) Metal cutting and machine tools - A B Chattopadhyay
6) A course in Workshop Technology – Vol II – B S Raghuvanshi
7) Digital principles and Applications – Leach, Malvino and Saha

Instructor bio

Prof. Asimava Roy Choudhury

IIT Kharagpur
Prof. Asimava Roy Choudhury received his B.E, (Mechanical) Degree from Jadavpur University in 1983, M.Tech. (Machine Tools Engg) from IIT Kharagpur in 1984 and Ph.D. (Engg) from IIT Kharagpur in 1999. Asimava Roy Choudhury is at present a professor in the Mechanical Engineering Department of IIT Kharagpur. His interests include: Computer numerical control, Direct slicing in Rapid Prototyping, Non-traditional manufacturing processes and Laser coating of surfaces.

Course certificate

The course is free to enroll and learn from. But if you want a certificate, you have to register and write the proctored exam conducted by us in person at any of the designated exam centres.
The exam is optional for a fee of Rs 1000/- (Rupees one thousand only).
Date and Time of Exams: 23 October 2021 Morning session 9am to 12 noon; Afternoon Session 2pm to 5pm.
Registration url: Announcements will be made when the registration form is open for registrations.
The online registration form has to be filled and the certification exam fee needs to be paid. More details will be made available when the exam registration form is published. If there are any changes, it will be mentioned then.
Please check the form for more details on the cities where the exams will be held, the conditions you agree to when you fill the form etc.


Average assignment score = 25% of average of best 8 assignments out of the total 12 assignments given in the course.
Exam score = 75% of the proctored certification exam score out of 100

Final score = Average assignment score + Exam score

YOU WILL BE ELIGIBLE FOR A CERTIFICATE ONLY IF AVERAGE ASSIGNMENT SCORE >=10/25 AND EXAM SCORE >= 30/75. If one of the 2 criteria is not met, you will not get the certificate even if the Final score >= 40/100.

Certificate will have your name, photograph and the score in the final exam with the breakup.It will have the logos of NPTEL and IIT Kharagpur .It will be e-verifiable at nptel.ac.in/noc.

Only the e-certificate will be made available. Hard copies will not be dispatched.

Once again, thanks for your interest in our online courses and certification. Happy learning.

- NPTEL team

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