Lecture00 Instructions

7/29/2019 Lecture00 Instructions

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ME119:

Engineering Drawing & Graphics

0. Preamble

Department of Mechanical Engineering

Indian Institute of Technology Bombay


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Preamble

Drawing is the Language of Engineersjust as Maths is the Queenof Science. To become a good engineer, you need have good

- analytic skills (mathematical and computing skills),

- Sketching skills (quick rendering of what you see or imagine

enables more iterations within limited time),

- Drawing skills (formalized sketches) and

- 2D/3D CAD modeling skills (CAD model becomes the core of all

other down stream activities).

You should have an open and unbiased mind and team spirit that

gives dues respect to all disciplines. Because, products today are

too complex and requires multi-disciplinary teams.


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PreambleSketching skills - Leonardo da Vinci

You need to sharpen your skills in sketching because sketching isfaster; it matches with your thinking speed and enables several

design iterations. This is a prerequisite to become a good designer.

Example is Leonardo da Vinci. He was actually a great sketcher

and painter. He conceived many ideas, theories and contraptions

that were far ahead of his time. So, he simply sketched them and

left behind for next generations to pursue. Many of his ideas took

centuries to become practical. Some of his contributions are:

Paintings: Mona Lisa, Last supper

Sc. & Engg: Helicopter, Battle tank, Solar power collector, Calculator, Bobbin

winder, Tensile testing machine for wire, anatomy, Architecture, Optics,

Hydrodynamics,


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PreamblePaintings of Leonardo da Vinci

Mona Lisa Last Supper Vitruvian Man


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PreambleSc./Engg. Contributions of Leonardo da Vinci

A machine

for grinding

convex

lensesVarious hydraulic

machines

A parabolic

compass


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PreambleWar Contributions of Leonardo da Vinci

War

machines

Battle tank

Cannons
http://localhost/var/www/apps/conversion/tmp/scratch_7//upload.wikimedia.org/wikipedia/commons/a/ac/An_Artillery_Park.jpghttp://localhost/var/www/apps/conversion/tmp/scratch_7//upload.wikimedia.org/wikipedia/commons/7/7a/Leonardo_cannons.JPGhttp://localhost/var/www/apps/conversion/tmp/scratch_7//upload.wikimedia.org/wikipedia/commons/7/70/DaVinciTankAtAmboise.jpeg


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PreambleFlying Contributions of Leonardo da Vinci

The flight ofa bird

A Flying Machine

Parachute

Aerial screw (Helicopter)
http://localhost/var/www/apps/conversion/tmp/scratch_7//upload.wikimedia.org/wikipedia/commons/3/37/Leonardo_da_Vinci_helicopter.jpghttp://en.wikipedia.org/wiki/File:Leonardo_flying_machine.JPGhttp://localhost/var/www/apps/conversion/tmp/scratch_7//upload.wikimedia.org/wikipedia/commons/c/c5/Leonardo_Design_for_a_Flying_Machine,_c._1488.jpghttp://localhost/var/www/apps/conversion/tmp/scratch_7//upload.wikimedia.org/wikipedia/commons/d/d4/Leonardo_flight_of_bird.JPG


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PreambleAnatomical Contributions of Leonardo da Vinci

Anatomical study

of the arm

Studies of Embryos

Study of the proportions

of the head

Sectional view of skull
http://localhost/var/www/apps/conversion/tmp/scratch_7//upload.wikimedia.org/wikipedia/commons/a/ae/View_of_a_Skull_III.jpghttp://en.wikipedia.org/wiki/File:Proportions_of_the_Head.jpghttp://localhost/var/www/apps/conversion/tmp/scratch_7//upload.wikimedia.org/wikipedia/commons/c/c9/Da_Vinci_Studies_of_Embryos_Luc_Viatour.jpghttp://en.wikipedia.org/wiki/File:Studies_of_the_Arm_showing_the_Movements_made_by_the_Biceps.jpg


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Preamble

About 15 years ago, we used to teach Engineering Drawing in 3semesters. At that time, we could give good exposure in sketching,

drawing, machine design and 2D&3D CAD modeling. Since we

have only one course now, we shall focus on manual drawings and

some exposure to 2D CAD.

There will not be any formal training in sketching. However, you

shall reserve a plain notebook exclusively for this course. After

every lecture class, practice the problems in the sketch book and

bring them to the class.

In this course, you will use only drafting board and instruments to

render your drawings. However, our dream is to evolve this course

in which we train you in sketching skills that you will convert into

accurate models using CAD.


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Preamble

During the course of a design, only the last few sketches will beconverted into drawings or CAD model. We even want you in future

to convert your ideas into physical models using totally modern

automatic machines such as Rapid Prototyping (3D Printing) or

CNC machines.

We do curve fitting. Often curves vary in curvature along their

length. So, choosing the gap between the sample points is

important as we have to finally draw a freehand curve over these

points.


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Preamble

We need to cover a vast syllabus in 13 sheets. So, it is importantfor you to spend adequate time before coming to these lectures as

well as the drawing sessions.

Quickly skim through Chapters 1-5 of N.D. Bhats book that cover

the basic things such as- Use of drawing instruments

- Sheet layout and Freehand sketching

- Lines, Lettering and Dimensioning

- Scales- Geometrical constructions


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PreambleDrawing Sheet & Board

Use only A3 (420 x 297) drawing sheets.

Fix the sheets firmly on all four corners with cello tapes. No clips or

pins are allowed.

Bring a good cello tape dispenser, paper cutter and scissors for this

purpose.

Before fixing the sheet, remove any cello tape of the previous use

on the drawing board and repeat the same while leaving the hall.

Use the tilting of the drawing board.


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PreamblePencil

Do not use conventional pencils and sharpeners. Use 0.5mm diacollet pencil.

Bring at least 2 pencils, one for HB and the other for 2B.

Staedler brand is recommended. If you use Staedler, use their lead

only.

In addition to the standard black lead, RED color leads are also

available but are more expensive. You are welcome to use them.

You will find them useful when you construct overlapping objects.


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PreambleGuidance in the Drawing Hall

One professor and some TAs/ RAs will be available in the hall toguide you.

You are also welcome to discuss with your friends.


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PreambleCompensatory Classes

80% attendance is compulsory.

All sheets shall be completed. Otherwise, you will loose marks.

When you miss, compensate by contacting any of the four RAs (not

TAs).

No girl student will work alone in the drawing hall at any time.


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Thank You!K.P. Karunakaran

Professor

Department of Mechanical Engineering

Indian Institute of Technology Bombay

Powai, Mumbai-400076, INDIA

Tel.: 022-25767530/ [email protected]

www.me.iitb.ac.in/~karuna

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