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The AMM headquarter is currently located at the Department of Engineering Design, IIT Madras. A new set of office bearers have taken charge of the affairs of AMM. AMM invites both individual and corporate membership from Indian academia, research organizations and industry. Membership benefits and other information about AMM are available at www.ammindia.org. The body of Zonal Vice Presidents (ZVPs) is active over the past several years with representations from the four corners of the country. They are playing the role of nodal agencies so as to decentralise the AMM official activities and to organise workshops under the aegis of AMM to popularise the mechanism science in their respective regions. They also form the editorial team of this news bulletin. AMM invites contributory articles from its members and others working in the various fields of mechanisms science for this quarterly news bulletin. Interested people can contact the editorial team.
Office Bearers of the AMM: Prof. C. Amarnath (President) Retired Professor, Department of Mechanical Engineering, Indian Institute of Technology, Bombay, Powai, Mumbai 400076, INDIA Phone: + 91 80 2368 2151 Email: [email protected]
Prof. Ashitava Ghosal (Vice President) Department of Mechanical Engineering, Indian Institute of Science, Bangalore 560 012, INDIA. Phone: +91 80 2293 2956 Email: [email protected] Web: http://www.mecheng.iisc.ernet.in/~asitava
Dr. G. Saravana Kumar (Secretary) Department of Engineering Design, Indian Institute of Technology, Madras, Chennai 600036, INDIA. Phone: + 91 (44) 2257 4736 Email: [email protected] Web: http://ed.iitm.ac.in/~gsaravana
Dr. Palaniappan Ramu (Treasurer) Department of Engineering Design, Indian Institute of Technology, Madras, Chennai 600036, INDIA. Phone: + 91 (44) 2257 4738 Email: [email protected] Web: http://ed.iitm.ac.in/~palramu
About the Association of Machines and Mechanisms (AMM)
Dr. Santanu Das (Editor-in-Chief, News Bulletin)
Professor and Head, Department of Mechanical Engineering Kalyani Government Engineering College, Kalyani- 741235, West Bengal, INDIA
Phone: +91 9433956050
Email: [email protected] Dr. Shankar Sehgal, (Zonal Vice President [ZVP] North) Assistant Professor, Mechanical Engineering Department, Room No. 102, Block 2, U.I.E.T., Sector-25 Panjab University, Chandigarh- 160 014. INDIA Phone: +91 95010 24161 E-mail: [email protected] Dr. R. Ranganath, (ZVP, South) Spacecraft Mechanisms Group, ISRO Satellite Centre, Bangalore-560017, INDIA Phone: +91 (80) 25082417 Email: [email protected]
Dr. Ranjit Kumar Barai, (ZVP, East) Associate Professor, Control System Laboratory, Electrical Engineering Department, Jadavpur University, Kolkata- 700 032, INDIA Phone: +91 (33) 24139270 Email: [email protected] Dr. Shital S. Chiddarwar (ZVP, West) Assistant Professor, Dept of Mechanical Engineering Visvesvaraya National Institute of Technology, Nagpur, INDIA Phone: +91 9561050130 Email: [email protected]
“… the only purpose of science is to ease the hardship of human existence.”
--- B. Brecht (From : The Life of Galileo)
Editorial Team of the News Bulletin
4
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Congratulations!! We are happy to note that the Dr. P. K. Patwardhan Technology Development Award for the year 2015 is conferred upon the following technology development effort :
'A Remotely Operated Ground Vehicle (Rover) for Indian Army'
by Prof. Anirban Guha and team of the Department of Mechanical Engineering, IIT Bombay. This is based on the recommendations of the Award Committee. The award carries a citation and a cash incentive of Rs. 25,000/- and will be presented during the Teachers’ Day function scheduled to be held at IIT Bombay during September, 2016. The Team consists of Prof. Anirban Guha, Prof. C. Amarnath, Prof. B. Seth, Prof. K. Kurien Issac and Mr. Abhay Kharade (Project Staff). The Secretary, Association of Machines and Mechanisms
Member in the News
6
3D Printers
Dr. G. Saravana Kumar Associate Professor, Department of Engineering Design, IIT Madras, Chennai 600036
Email: [email protected] Abstract: Arising as a new manufacturing technology, additive manufacturing (AM) or 3D printing has caught the attention of every engineering discipline from automotive to biomedical engineering. These systems are based on a layered manufacturing technique where a 3D CAD model of the object is decomposed into cross-sectional layer representation and built in an automated fabrication machine to form physical objects. This article briefs some aspects of AM, along with some details to building a 3D printer based on open source hardware and software.
1. Introduction to 3D Printing Process 3D printing allows to quickly fabricate complex-shaped, three-dimensional parts directly from CAD models. This means that the designers have the choice of making from concept design a physical model for viewing, studying and testing as well as for manufacturing. It involves slicing the CAD model of an object into thin slices, which can be fabricated by using many solid free form manufacturing process. The advantages of these manufacturing process is that they build complex 3D objects based on automatic process planning from CAD models, use generic machines that do not need part specific fixtures or tools and require no or minimum human intervention. Unlike CNC machines, which remove material to obtain a desired shape, 3D printing systems are additive in nature. Implementation of this layered manufacturing for modern manufacturing has been realized due to the development of many technologies, including CAD, laser material processing, printing, precision motion controllers along with some traditional technologies like powder metallurgy, welding, CNC machining and lithography. Approximately three decades ago, the art of building 3D objects by layers was significantly advanced by 3D Systems Inc., a US based company [1] based on the concept of realizing 3D shapes by photo curing polymers using lasers also popularly known as Stereo-Lithography. Today many other systems are available that build layered objects by lamination of sheet material (Helisys [2]), binding powders (DTM [3] and EOS [4]) or extrusion of thermoplastics (Stratasys [5]) to name a few. The availability of vast number of patented process has ensured that many materials can be processed providing designers with alternatives to realize physical prototypes and end use parts. Recent advances in selective laser melting using laser and electron beam as power sources has enabled printing production grade metallic components for end use application in aerospace, biomedical and automotive applications [4,6]. 2. Process Sequence of 3D Printing The 3D printing process essentially starts with the creation of a computer model of the object and ends with the realization of physical prototype of the object. The complete process can be sequenced into sub process and are further enumerated and described briefly (illustration in figure 1).
Contributed Article
7
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