On the future of this blog…

August 10, 2013

Dearest Mechies! Henceforth, this blog will focus on learning Mechanical Engineering subjects! It won’t be a textbook..rather, it’ll be discussion of key concepts, links to reference material, links to video lectures, discussions on these topics, Do It Yourself activities, codes, etc. This I felt would be useful to readers of this blog. I won’t be going to the nitty gritties of the subjects, but will just discuss the jkey concepts, ideas and refer related material for further information and depth. In addition to this, there will also be content related to industry related topics, new developments, higher studies, career options, etc.

For ease of identifying and organizing, the entire body of knowledge for mechanical engineering that will be discussed in this blog will be divided into the following four areas:

1. Applied Mechanics and Design

2. Fluid and Thermal Sciences

3. Manufacturing and Industrial Engineering

4. Engineering Mathematics

5. Interdisciplinary Topics –  some electrical, electronics, bio, chem, materials and computer science

6. Advanced Topics – Computational Mechanics related topics

7. Product Specific Engineering topics – Automotive, Aerospace, Renewables, etc.

The prerequisites for these would be high school math and science. The articles are targeted at all those who have a high school math and science background, Most importantly, its for people with an insatiable desire for learning mechanical engineering!

For those looking on some study tips, on how to learn more in less time, how to complete an MIT course in one year and more such stuff, please go through this wonderful blog by Scott Young. He’s a genius and his articles arre awesome. They’ve helped me a lot.

I wish to devote a significant portion of my life for this purpose.. countless known and unkown people have shared their knowledge with me and helped me in my life.. The engineer and human in me is humbled by their kind acts…I believe I too have a duty to contribute something to my world..so I begin this mission…hope it is useful to my world and my people!


I Love Mechanical Engineering continues!

April 4, 2013

Its going to be 7 years since I entered my bachelors course in Mechanical Engineering.. I still love every bit of this branch.. and am fascinated by its beauty every day… I see I’m related to not just science and technology but also to the arts and sports!

LOve strory continues.. but yet to invent something guys! 🙂

My WordPress Blog Annual Report 2012

January 2, 2013

The WordPress.com stats helper monkeys prepared a 2012 annual report for this blog.

Here’s an excerpt:

600 people reached the top of Mt. Everest in 2012. This blog got about 4,500 views in 2012. If every person who reached the top of Mt. Everest viewed this blog, it would have taken 8 years to get that many views.

Click here to see the complete report.

Mechies! Are we underpaid and overworked?

July 16, 2012

I knew even before I entered this world of mechanical engineering that I’ll not be getting as handsomely paid as my colleagues in the Software/IT field. But I had hope that some time the world would recognize the worth of  mechanical engineers and start paying them more. And I believed money is not important – its personal satisfaction that matters the most! But over these six years – my change from a teenager to a young man in his twenties has changed my thinking too. I realized that the kind of money that my friends in the field of Information Technology and Management was much beyond what an average mechie earns. The salary that a mechanical engineer earns at the end of his career is what the IT guy earns after just 4 or five years of experience.

Though one can argue that the satisfaction a mechanical engineer gets with his job is higher because he is doing something that he likes, the stark reality is that most mechies who graduate out of college are not given pure technical or engineering jobs. They do techno-management works like managing the labour, placing order and maintaining supplies. The result is that they hardly use anything that they learrn in college. Thermodynamics, fluid mechanics, theory of machines, manufacturing sciences, industrial engineering – all get erased from the mind. They remain no more mechies but managers.  The only exception where people really do a bit of mechanical engineering is usually the product dvelopment & R&D departments.

All these mechie turned managers work for almost 12  hours a day and earn only a fraction of what their counterparts in the IT or finance field earn. This makes me think – why this discrimination?  But I get the answer once I think about the fate of those engaged in agriculture – their work is more important and vital for survival than anyone else. But they get paid the least. Its all in the game.

Besided no one stopped me from earning more. What if I get paid less? Its an opportunity for me to start my own business and pay other mechanical engineers much better. Lets see..


TATA Motors Recruitment Test

February 10, 2009

Some of the questions that were asked in this test include:
1. When boiler bursts, whom u would inform?
2. What does one mean by modular ratio?
3. What is ‘envelope of damped free vibration’?
4. A ball with a mass M is falling on to the ground with some velocity V1 and rising with velocity V2 . Find the impulse?
5. Contd.. for 5th problem. When time of contact is given then find force exerted on the ground.
6. Two masses are connecting with string on to pulley coefficient of friction of mass m1 is given and also m1 and m2 are given. Find the relation b/n m1 and m2 , to make m2 move downwards .
7. In a damped free excitation system maximum amplitude occurs
a. before resonance             b. after resonance
8. What are set screws?
9. A four bar link mechanism is given with moment m acting on crank and also a force given at crank end. Find the reaction at hinged end of crank.
10. Deflection due to self weight of a uniform rod of diameter D and unit density and length is given by____________.
11. Name the type of key used in wrist watch?
12. Bending stress is proportional to_____________
13. The hypoid gears are __________
14. Hollow cylinder of outer D0 is given. Find the diameter of solid cylinder for the same material and same torsional strength ?
15. What is the principle plane ?
16. Two masses are resting on a inclined plane with 30 degree angle and the two masses are welded with weightless rod and coefficients of friction is given. Find the common acceleration of a two masses.
17. Two masses are of different weights smaller one is placed on the bigger mass. If the force is acting on bigger mass (given),  find the acceleration of smaller mass.
18. Stress on minor diameter of bolt when bolt is subjected to longitudinal force.
19. no of independent elastic constants required for isotropic material?
20. pitch of the bolt of 30 mm metric thread dia meter is?
21. the ratio of natural frequency on earth to moon?
22. upper portion of set screw is given fig shown and asked which type of set screw is ?
23. Efficiency of screw jack formula?
24. which of the parts given is harder one? Ans a). inner case b)outer case like that?
25. Max efficiency of screw jack formula?
26. Given some c/s of diffirent types which is having more torsional strength ?
27. Max principle stress theory is valid for which material?
28. efficiency of reveted joints of different types has given which is having max efficiency ?
29. if the roots are real then which type of vibrations will occur in damped systems ?
30. problem on transmissibility ?
31. when the disc is rotating on which on man is standing at the edge then what is the possibility of increase in speed of the disc? A).man moves towards centre b)out ward? Like that
32. what is the principle behind the collisions of ball ?which is related to Q.7 ? ans constant linear momentum.
33. Find the elongation of the bar due to self weight
34. Problem on the cantilever deflection
35. Problem on the two blocks connected by string one is on table and on is hanging from the pulley…mechanics’ problem
36. Ratio of the tension of the band block breaks
37. max and normal efficiency of the power scew
38. what is monel metal
39. for which material max normal stress theory is used
40. efficiency of the riveted joints
41. coefficient of friction for the greased ball bearing
42. which key is used in wrist watch
43. bending stress is proportional to 1. directly/inversely proportional to section modulus
44. find the width of the strongest beam that can be cut of cylindrical log of wood whose dia is ‘d’
45. if the phi is friction angle then which of the following can not be the value of the tan(phi) a) 0 b) 1.5 mu etc. ans is 0
46. problem on the transmissibility …to calculate dynamic amplitude
47. what is the poison’s ratio?


12. Bending stress is proportional to  section modulus
13. The hypoid gears are non intersecting non parallel gears.

The Xpert’s Secret

December 3, 2008

Every budding engineer dreams to be an expert expecting people to look at him in awe and with great respect.But becoming an expert is not child’s play.It requires something special.No,…I’m not talking about your innate abilities or talents.They do account for it, but there’s something much more interesting and important which I found out in the following articles:-

Here’s a superbly written article(supported by researched facts) by Kathy Sierra and Dan Russell on ‘How to be an Expert’ , which I decide to mention in my Blog as soon as I read it-
How to be an Expert

For some tips on Problem-Solving here is a wikihow article ‘How to Define a Problem’ : Defining a problem like Einstein

For some professional advice and tips on doing research, here is a link to an IIT Madras Thermal Science Professor’s Blog: The Unruled Notebook.

The IIT Professor’s Advice

Wanna know the all time genius Da Vinci’s secret and emulate him?Then don’t forget to read the following article !

Think like Da-Vinci

The MechE

Autonomous Robots

December 1, 2008

Autonomous robots may be characterized as intelligent machines capable of performing tasks in unstructured environments without explicit or continuous human control over their movements. Concepts range from small insect-like machines to highly sophisticated humanoid robots with social intelligence and awareness of their environment.

An autonomous robot can sense and gain information about its surroundings, work and move either part or all of itself for an extended period without human assistance, and avoid situations that are harmful to people, property, or itself. It may also learn, or gain new capabilities, like adapting to changing conditions or adjusting strategies for accomplishing its tasks.

New categories of autonomous and mobile robots have been developed that can significantly expand the applications of robotics.

Cognitive robots are endowed with artificial reasoning skills to achieve complex goals in complex environments. Cognitive robots can be used in manufacturing and as home helpers, caregivers, or emergency and rescue aids. They are also useful for space missions.

Moving On Their Own – A flying robot stars in a Microsoft video for young people interested in computer science

A number of research projects are focused on cognitive robotic systems, including the European Union’s project CoSy—Cognitive Systems for Cognitive Assistants—aimed at developing robots that are more aware of their environment and better able to interact with humans. Another is provided by the cognitive robot companion in the Cogniron Project of the French National Center for Scientific Research. The project aims at developing a robot that would serve humans in their daily lives. It would exhibit cognitive capabilities for adapting its behavior to changing situations and for various tasks.

Neurorobotics couples neuroscience with robotics. The overall goals of the activity are to develop high-performance, human-centered robotic systems to serve as physical platforms for validating biological models. Current activities are focused on developing robotic devices with control systems that mimic the nervous system, such as brain-inspired algorithms and models of biological neural networks.

The field of evolutionary robotics emerged from the idea of allowing robots to evolve. Although the field shares many of the insights of artificial life, which pioneered the use of genetic algorithms in the 1970s and 1980s, evolutionary robotics is distinguished by its insistence on making the leap from computer animations to physical machines. Evolutionary robotics aims at developing robots that acquire their own skills through close interaction with the environment. Evolutionary computational tools like neural networks, genetic algorithms, and fuzzy logic are used in developing intelligent autonomous controllers for robots.

Life-like robots are biologically inspired robots that resemble living systems and biological organisms, from insects to humans. Mobility mechanisms are incorporated into their design that mimic biological mobility systems, and the resulting robots are referred to as biomimetic robots. A recent life-like robot project is the BigDog built by Boston Dynamics Inc. with funding from DARPA—a quadruped robot that can walk, run, or climb on rough terrain (and other places where accessibility is difficult), and carry heavy loads up to 340 pounds. The iCat robot platform for human-robot interaction research, developed by Philips labs in the Netherlands, can generate different facial expressions and talks to its users. The Amphibian Snake robot ACM-R5, built by the Hirose Fukushima Robotics Lab in Japan, can slither and swim under water for 30 minutes, can navigate in very confined spaces, and can search for earthquake victims.

Several humanoid and anthropomorphic robots were created to imitate some of the physical and mental functions of humans. They wrestle, skate, or play soccer. Honda’s Asimo, originally developed in 2000, has more recently been equipped with software and an array of eight microphones, which enable it to understand three humans shouting at once. Sony has a dancing robot, Sugoi. A home helper robot, HRP-2 or Promet, from Kawada Industries Inc., understands voice commands. HRP-3 from the same company can work in hazardous environments and carry out disaster relief. The Kansei robot, developed by Japan’s Robot and Science Institute, can make up 36 different facial expressions in response to words associated with different emotions.

Cyborg robots, in the form of hybrid biological/artificial assistive limbs and wearable robots, have been developed to expand and improve human capability. The robotic exoskeleton developed by Raytheon amplifies the wearer’s ability and enhances personal mobility. An integrated prosthetic arm prototype that can be controlled naturally has been developed by an international team led by Johns Hopkins University under DARPA sponsorship. The arm, Proto 1, provides sensory feedback and allows for eight degrees of freedom—a level of control far beyond the current state of the art for prosthetic limbs.

Advances in computing, sensing, networking, and communication technologies have led to the development of distributed robotics and multirobot systems for performing complex tasks in dynamic and challenging environments. Applications include search and rescue, reconnaissance, cleanups of toxic spills, firefighting, and planetary exploration.

Swarm robotics envisions large numbers of mostly simple robots. It is inspired by swarm intelligence, the principle of cooperation observed in colonies of ants and bees. The swarm may consist of heterogeneous robots, differing in the type of sensors, manipulators, and computational power. Robots can communicate by wireless transmission systems.

Potential applications for swarm robotics include tasks that demand miniaturization, like distributed sensing tasks in micromachinery or the human body; tasks that demand cheap design, such as mining or agricultural foraging; and tasks for which failure can be very costly, such as planetary exploration. A current swarm robotic project is the shape-shifting, or “claytronic,” robots of Carnegie Mellon University. The pocket-size, cylindrical wheeled robots of the swarm use electromagnetic forces to cling together, and to assume different shapes.
Inputs have been taken from “memagazine” and wiki.

The MechE

Top 10 Reasons – Why should one be a Mechanical Engineer ?

November 28, 2008

1.You get the opportunity to create something tangible and useful.Ur creations will be used by others.It gives u the greatest joy.

2.Its the broadest branch of engineering…so your career options are open even after u graduate:-

Defence,Civil services,High end R&D,Manufacturing,Design,Energy sector,Management,Entrepreneurship,Masters(ME/MS)

3.Variety to be learnt- u learn how to design and make things ranging from a Safety Pin to a Spacecraft.

4.Easy to imagine and visualize whatever u learn

5.Develop a range of skills – u learn the work of a machine operator (machinist), a smith, a foundryman, a mechanic,a plant manager,a researcher and a policy maker.

6.U work with massive machines (majestic in nature) to tiny precision instruments,micro and nano devices.

u’ll be savviest engineer.

7.Importance of ur work.U form the human resource that is required for the survival of any industry and forms the backbone of modern human life.u r the person who may generate power/energy from natural resources,make equipments and processes to mine minerals,make cars, bikes ,buses, trucks, planes,ships(transportation can be compared to human blood that transports nutrients), make machines that manufacture products ranging from food to surgical instruments to weapons,mange factories and businesses.

8.Get paid handsomely(after gaining a few years experience even if not as a fresher).

9.Not much of girls hanging around(they usually don’t prefer to opt for this course,its thought to be a manly course).U dont have to worry about getting dressed perfectly for class or for girls giggling at u for some silly or not so silly but serious reason.Ur in a man’s world.But there are a few out of the ordinary and brainy girls who do take up this course and luv it.

10.It sounds and feels nice to be called a Mechanical Engineer.

The MechE

My Rendezvous with Mechanical Engineering

November 28, 2008

I don’ quite remember the exact moment when I decided that I was going to be a mechanical engineer.Though I had always wanted to be an engineer, i had never ever thought of specialization (but i did have a great deal of interest in Aeroplanes and Spacecrafts) until I had undergone a career counselling programme.After being made to write tests for hours that gauged my aptitude,skills,personality and discovered my interests i was advised by the counsellor to take up careers in any of these streams-Architecture,Mechanical Engineering,Industrial Design,Genetic Engineering,Interior Designing,Astronomy/Astrophysics,Bookkeeping ,etc.I was suggested to choose a course that required artistic and clerical abilities.but I wasn’t much interested in career planning coz it was too early…i was in my 9th standard and there were a jolly good 3 years to think about joining a college! All I wanted was to be associated with the world of technology that had immensely changed my nation.

As i moved into my eleventh standard I felt very comfortable with science chapters related to mechanical engineering like statics, dynamics and fluid mechanics and the thermal sciences.As i moved into class 12 I started feeling uncomfortable with electricity and electronics primarily because it became difficult to imagine and visualize the concepts of these sciences as compared to the mechanical sciences.

I still loved Computer Science because I was good at programming and my CS Mam was an excellent teacher.But then young India was too obsessed with Software and electronics ….especially the top rankers chose these courses…and i wanted to be different..hence I decided – to go for Mechanical Engineering .I brooded over the topic and came up with umpteen no. of reasons and decided my career…

and joined a UG Bachelor of Engineering(Mechanical)course .

Top 10 reasons why I chose to be a Mechanical Engineer on my next post


Hello world!

November 25, 2008

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