Lecture 1

WedTue

Mon

Fri

Thurs

DayGroup

54

3

2

1G.s. Kumar + S. C. Chakraborty

Tutors

M.A. Reddy + A. Singh

A Dewan +V S Moholkar

P. Mahanta + M. Jawed

M.K. Das + T.R. Lyngdoh

Instructor – P.S. Robi

8/3/2005 2

Acknowledgement

I express my sincere thanks to Prof. S.C. Mishra, Dept. of Mechanical Engineering for providing all the required teaching materials for this course.

Scheme of EvaluationScheme of Evaluation

35%

20%

10%

30%

5%

:

:

:

:

:

End Semester Examination

Mid Semester Examination

Quizzes (unannounced)

Assignments (11 Nos.)

Classroom Participation

Assignments are to be completed in the Drawing Hall during the assigned periods only.Assignments are to be submitted at the specified locations.No make-up class for the incomplete assignments.Only one make-up class for the missed class(es).Attendance < 75% individually of lecture and tutorial - debarred from the end semester exam.No entry to the lecture hall 5 minutes after the start of the class.

Note:Note:

Universal language for engineers - graphical means of expression of technical details without the barrier of a language.

Dr P.S. RobiIIT Guwahati


• Diagrams/sketches/pictures – communication skills • We grasp information easily if it is illustrated with

diagrams, sketches, pictures, etc.

LCA - the world's smallest, light weight, multi-role supersonic combat aircraft of the world



• It would just be impossible to communicate all necessary details about the LCA verbally or in writing – Illustration (picture/drawing) is useful.

• A picture/drawing is worth a thousand words..

• The LCA would be impossible to create without computer graphics and drawing models. Drawings are the road maps which show how to manufacture products and structures.



• Graphical representation of an object – Drawing

• Engineering drawing – A drawing of an object that contains all information - like actual shape, accurate size, manufacturing methods, etc., required for its construction.



• No construction/manufacturing of any (man -made) engineering objects is possible without engineering drawing.

• Approximately 300 Indian and foreign companies and labs participated in the design and fabrication of GSLV.

• Without proper universal technical language (drawing), it would not have been possible to share the information of hundreds of industries and labs and thus to go for the fabrication and launch of

GSLV.

April 18, 2001: Launch of GSLV by ISRO



• Nature does not go by any drawings for the design of beautiful natural things –Atheist

• Nature works under the control of God. God does everything as per His plan. Therefore, natural constructions do go through the process of drawings - Theist



What will you learn in this course?

You will learn - How industry communicates technical information.

• Visualization – the ability to mentally control visual information.• Graphics theory – geometry and projection techniques.• Standards – set of rules that govern how parts are made and technical

drawings are represented.• Conventions – commonly accepted practices and methods used for

technical drawings.• Tools – devices used to create technical drawings and models.• Applications – the various uses for technical drawings.

In learning the techniques of engineering drawing, you will find that something very important has happened - it has changed the very way that you think about technical images and, more facts and figures will stay with you throughout your career – keep your motivation high!



Drawing is important for all branches of engineering.

• If you are not serious in this course, you will find difficulty in properly understanding and communicating the technical information in other subjects throughout your BTechprogram and engineering career as well.

No way out. Do not ignore the course, take it very seriously!



Engineering drawing is completely different from artistic drawing, which are used to express aesthetic, philosophical, and abstract ideas.



Engineering Drawing

Manual Drawing Computer GraphicsCADD

Computer aided design and drafting (CADD) -Computer has a major impact on the methods used to design and create technical drawings.

Design and drafting on computer are cheap and less time consuming.

Why we go for manual drawing?



Computer cannot replace the drafting board and equipment as a learning tool.

Once you have learned the basics of mathematics, now after class 12, you are allowed the use of calculator and computer.

If basic fundamentals are clear, better use can be made of the power of the software.

To be an expert in technical drawing, this first course on Engineering (manual) Drawing is the first step.

Dr P S RobiIIT Guwahati


Two ApproachesTwo Approaches1.1. Linear engineering Linear engineering

(design process)(design process)• Traditional design process is a

sequential process that can be grouped into six major activities, beginning with the identification of the problem and ending with documentation and design. Engineering drawing/graphics are used throughout this process to document design solution.

2.2. Concurrent engineering Concurrent engineering (design process)(design process)

Problem Identification

Preliminary Ideas

Design Refinement

Analysis

Optimization

Documentation



2.2. Concurrent engineeringConcurrent engineering• An alternate approach to the linear design process – the

new way of designing, with its integrated approach – gets everyone (technical and non-technical including the customer) involved in the design process.



Items required for drawing Items required for drawing 1. Drawing board2. Drawing sheet3. Mini-drafter/drafting machine4. Instrument box containing compass, divider, etc.5. Scales6. Protractor7. French curves8. Drawing pencils9. Eraser10.Drawing clip/pin/adhesive tape11.Sharpener12.Duster



Drawing board must be placed on the table with working edge always to be at the left side.



A3500 x 500D3

A2700 x 500D2

A11000 x 700D1

A01500 x 1000D0

Recommended for use with sheet sizes

Length x Width(mm)

Designation

Dimensions of Engineer’s Drawing Boards

D0 and D1 for drawing offices, for students use – D2



Professional draftsman - Drafting machineStudents – Mini-drafter – a miniature version of the drafting machine



Mini-drafterMini-drafter fixed on drawing board



Procedure for clamping the mini-drafterSet the protractor head with reference mark indexing zero degree, then fix the clamp of the mini-drafter at the top left corner either along the top horizontal edge of the board or along the left vertical edge of the board.

With the drawing sheet placed underneath the scales of the mini-drafter, fix the drawing sheet to the drawing board with the scales of the mini-drafter aligned either with the vertical or the horizontal borderlines of the drawing sheet. Dr P S Robi

IIT Guwahati


Instrument box



Lecture 1

Documents

drawing engineering

robi tutors

theist dr

engineering manual drawing

technical drawings

drawing hall

artistic drawing

technical information