Monday, December 22, 2008

Congrats Arunvelayudan

Arun velayudhan of I year Information Technology ,is congratulated and awarded a book worth of Rs 300/- for his consistent performance in the subject "Engineering Graphics "

Sunday, December 21, 2008

orthographic projection part II

Owing to the response and the request from many of the students from various colleges few more drawings are uploaded.
Do make use of the drawings and share it with others.
http://rapidshare.com/files/175418910/orthographic3.rar

For first time users: Part one is available in previous posts, you can download it. It contains 3 drawings.

Wednesday, December 17, 2008

Tips for mechanical Engineers

* A mechanical engineering curriculum is a course of study that will require discipline and hard work to complete. Having fun and keeping the bigger picture in mind will help you get through it. Making friends with classmates is particularly helpful, as is being courteous to any teaching assistants or tutors who make themselves available.

* Take advantage of any opportunity to get hands-on experience throughout your education, as well as outside of class. At the high school level, try shop classes, especially auto shop if it's offered. At the university level, look to participate in robotics contests, hybrid and human powered vehicle design projects, or even check out the concrete canoe competition if it's active at your school. Your professors can to tell you more about the programs, projects, and research opportunities offered at your particular school.
* Co-op programs or internships provide excellent experience. The federal government offers co-op programs along with junior engineer hiring programs. Some government engineers work with weapon systems and research projects. Check the Office of Personnel Management (OPM) website for more information.

* Get practical experience if possible. Mechanical Engineering degrees are more theoretical, which is good. However, the importance of getting practical experience in any area that you may be interested in can't be overstated. If you want to go into auto design or manufacture, you might wish to try being a mechanic or working with a mechanic for a while. This will give a practical side to your theoretical studies.
* Look for opportunities and resources available from professional societies, such as ASME (American Society of Mechanical Engineers), ISTE etc. Subscribing to the monthly newsletter or magazine can keep you informed about the latest developments in the mechanical engineering field. The local chapter of the organization provides excellent opportunities to meet and learn from students and professionals in the field, and often also organizes trips and seminars.

Thursday, December 11, 2008

Orthographic projection

Find the links below:

Learners can download the content from links given below. Each of the links allows to download one model.
For viewing the models download and install the following software
download link
accept for the agreement and proceed to install.
Pl give your feedback about the usefulness of this work.


1.Model 1

2. Model 2

3. Model 3

Friday, December 5, 2008

Viva for workshop FAQs

FAQ s for viva Part 1

1. List some of the tools for welding
2. Differentiate gas and arc welding
3. What is the principle of welding
4. What are the gases used in welding
5. list some the accessories used for welding
6. Mention some of the tools used for carpentry
7. List some of the operations performed on lathe
8. What are the common materials used for plumbing
9. What is the purpose of vice?
10. How is the turning operation performed?
11. What is threading?
12. How are internal threads made?
13. How are pipes joined?
14. What is an electrode?
15. What is the given material that is used to weld ?
16. What are the metal joining processes followed?
17. List down the various parts of the lathe.
18. List some of the machines and their applications
19. What are pumps?
20. What is casting?
21. Explain the casting process.
22. list some of the accessories used in casting process
23. What is the least count of the vernier caliper that is given to you
24. List some of the valves you know.
25. What does MS, CI, GI and PVC stand for?

Guidelines for posting the case studies

Guide lines to be followed for posting the case studies
1. Posting positive criticism is highly encouraged. The negative opinions, criticism if any could be moderated and need not be specific to the person /company/ organization.
2. posting with relevant examples , quotes, incidents are highly appreciable.
3. postings are expected with a minimum of two pages
4. Quoting your name, Reg. no. ,roll number, college ,mail Id adds more value and gets you quicker response
5. since the information published is being viewed by others, concentration on the language and politeness in the communication is expected
6. if the articles ,information is found worthy it would be published in the website http://mechanicalsubjects.page.tl/
7. check the blog periodically for the updates
8. you can also subscribe to receive the updates
9. format for posting : 12 font- times new roman - 1.5 spacing , A4 size - atleast 5 pages .
10. for further clarifications mail to the author of the blog at
Subramanian.me@gmail.com

Case studies part III

1. post some of the common discussion forums available for selecting the B schools
2. list some of the management books ,resources available on the net
3. is money the only way to satisfy an employee. Discuss
4. various management tools available on the net.
5. HR management policies of various companies
6. list some of the management magazines
7. famous articles of the managers
8. management guru’s and their contributions

Case studies part-II

1. cite whether Malow’s theory can satisfy the present situation in management
2. explain your own management concepts with examples
3. how effective is tele conferencing ? how can we resolve the issues
4. in your opinion which means of communication is best /worst? Why?
5. modern control techniques followed in companies.
6. is JIT effective?
7. is informal communication needed?
8. is performance appraisal making a positive impact on the employees?
9. what are the ethics you follow in your individual life?
10. give examples for rational decision.
11. how management concepts differ from country to country?
12. economic, legal- poitical factors considered in international business environment
13. approaches in selecting an alternate
14. common mistakes made by employers- cite specific examples
15. is brain stoming effective?
16. are the management principles learnt or experienced?
17. how you improve the innovation and creativity of the employees?

POM CASE STUDIES

Case studies /Assignments
1. Cite the functions performed by a manager highlighting the important decisions taken by him and its impact
2. illustrate whether management is a science or an art
3. In your opinion do you accept whether scientific theories are able to be implemented in management
4. Analyze the various management schools in India and its applicability for global management thoughts
5. Perform an analysis of the Best policies adopted by the company managers.
6. planning methods followed by Indian auto manufacturers
7. Forecasting as applicable to aviation industry
8. key decisions made by managers
9. How should an organization be?
10. Is delegation necessary? What are the ten commonly work delegations?
11. Is centralization necessary? Give its impacts
12. Give the various evaluation methods for the employees
13. if you are the HR manager ,how will you recruit a person for the post of design manager for the fabrication company if the applicants no. exceeds 500
14. selection interviews followed by various companies
15. is GD helps for identifying a good employee
16. Training methods followed by auto manufacturers ,chemical companies, machine erections , software design companies
17. how effective are the management concepts to the real management
18. cite the qualities of various MDs COOs, CEOs

Thursday, December 4, 2008

POM unit wise explained

Find the notes explained unit wise in this link:
http://docs.google.com/Doc?id=dhk88qbd_47fccw37ht

KINEMATICS OF MACHINES question paper

B.E./B.Tech. DEGREE EXAMINATION,
Third Semester
Mechanical Engineering
ME 232 — KINEMATICS OF MACHINES
(Common to Mechatronics Engineering)

Time : Three hours Maximum : 100 marks
Instructions : 1. Answer ALL the questions.
2. Write brief procedure for graphical constructions.
3. Sketches should be drawn neatly.
4. Answers without units and with wrong units will carry
less marks.
5. Symbols used should be explained atleast once in each
solution.
6. Answers without writing the relevant equations and
equations without substituting the data will carry ZERO
marks.
PART A — (10 ? 2 = 20 marks)
1. How many inversions are possible from a four–bar kinematic chain? Name them based on their input–output motions.
2. What are the three conditions to obtain a four–bar crank–rocker mechanism?
3. Sketch the Geneva wheel indexing mechanism and state its application.
4. Distinguish normal component of acceleration and tangential component of acceleration.
5. State the advantages of cam mechanisms over linkage mechanisms.
6. Briefly write about undercutting in cam mechanisms.
7. State the relationship between circular pitch and the module.
8. Briefly write about reverted gear train with suitable sketch.
9. State the laws of dry friction.
10. The coefficient of friction between the belt and the pulley in a belt drive is 0.3. The angle of lap is 165?. If the tension on the tight side is 3000 N, determine the tension on the slack side.
PART B — (5 ? 16 = 80 marks)
11. (i) Define transmission angle. Sketch a drag–link mechanism in maximum
transmission angle and minimum transmission angle positions. (4)
(ii) Define kinematic inversion. Describe in detail with neat sketches an elliptic trammel. (6)
(iii) Design a four–bar crank rocker quick return mechanism for the following data : Rocker swing angle = 90?, Time ratio = 1.25 and output link length = 60 mm. (6)
12. (a) (i) How will you determine the magnitude and direction of the Coriolis
Acceleration vector? (2)
(ii) In a four–bar mechanism ABCD, the link lengths in mm are as
follows : Input AB = 25, coupler BC = 85, output CD = 50 and frame AD = 60. The angle between the frame and the input is 100?
measured anti–clockwise. The velocity of point B is 1.25 m/sec in
the clockwise direction. Sketch the mechanism and determine the
velocity and acceleration of the mid–point of the link BC. Also, find
the angular velocity and angular accelerations of the links BC
and CD. (14)
Or
(b) (i) State and prove the ARONHOLD–KENNEDY theorem involving
instantaneous centres. (5)
(ii) State the reasons for velocity and acceleration analysis. (3)
(iii) Derive the analytical expressions to determine the angular position
of the coupler and the angular position of the output link of a four
bar crank–rocker mechanism in terms of the link lengths and input
angular position. (8)
13. (a) (i) Sketch a cam–roller follower arrangement indicating important
cam terminologies and explain them in detail. (8)
(ii) Sketch and briefly compare the displacement, velocity and
acceleration diagrams for uniform velocity, uniform acceleration
and retardation, simple harmonic motion and cycloidal motion, used
in cam mechanisms. (8)
Or
(b) A disc cam used for moving a knife edge follower with simple harmonic motion during lift and uniform acceleration and retardation motion during return rotates in clockwise direction at 300 rpm. The line of motion of the follower has an offset 10 mm to the right of camshaft axis. The minimum radius of the cam is 30 mm. The lift of the follower
is 40 mm. The cam rotation angles are : Lift 60?, dwell 90?, return 120? and remaining angle for dwell. Draw the cam profile and determine the maximum velocity and acceleration during the lift and return.
14. (a) Two gear wheels mesh externally to give a velocity ratio of 3 to 1. The involute teeth has 6 mm module and 20? pressure angle. Addendum is equal to one module. The pinion rotates at 90 rpm. Determine :
(i) Number of teeth on pinion to avoid interference and the corresponding number on the wheel (ii) the length of path and arc of contact (iii) contact ratio and (iv) the maximum velocity of sliding.
Or
(b) In a reverted epicyclic gear train, the arm A carries two gears and and a compound gear . The gear meshes with gear and the gear meshes with gear . The numbers of teeth on , and are 80, 48 and 72 respectively. Find the speed and direction of gear when gear is fixed and arm A makes 400 rpm counter clockwise.
15. (a) (i) Prove or disprove the following statement :
‘‘Angle of friction is equal to angle of repose’’. (6)
(ii) A bolt is having V–threads. The pitch of the threads is 5 mm and
the V–angle is 55?. The mean diameter of the bolt is 20 mm. The
bolt is tightened by screwing a nut. The mean radius of the bearing
surface of the nut is 25 mm. The load on the bolt is 5000 N. The
coefficient of friction for nut and bolt is 0.1 whereas for nut and
bearing surface is 0.16. Determine the force required at the end of a
spanner 0.6 m long. (10)
Or
(b) (i) Briefly explain the following :
Slip of the belt and creep of the belt. (5)
(ii) An open belt drive connects two pulleys of 1.2 m and 0.5 diameters
on parallel shafts 4 m apart. The maximum tension in the belt is
1800 N. The coefficient of friction is 0.3. The driven pulley of
diameter 1.2 m runs at 250 rpm. Calculate the length of the belt
required, the power transmitted, and the torque on each of the two
shafts. (11)

Objective

In the present scenario, learning is so easy. Learning resources are abundant that we can get information of any kind in the internet. This blog is created to those who are interested in learning the fundamentals ,basics , concepts of Mechanical Engineering. Also the blog is aimed to share the resouces available in the internet in the single page. The users are therfore requested to give their comment and post the links of the resources in the forms like videos,pdf documents, free magazines, E books , Updates, upcoming events, University question Papers , solved problems etc .
SUBRAMANIAN