About basics of Engineering Graphics

2. INTRODUCTION
• Engineering graphics is used to represent the
real thing through drawings either manually or
using software.
05-Feb-19 2
M.KUMARASAMY COLLEGE OF
ENGINEERING

3. • It is a technical drawing.
• It can express shape, size, finish accurately
and clearly.
05-Feb-19 3
M.KUMARASAMY COLLEGE OF
ENGINEERING

4. • Engineering drawing
• Technical drawing
• Design of a variety components related to
engineering
05-Feb-19
M.KUMARASAMY COLLEGE OF
ENGINEERING
4

5. • The most necessary techniques of drawings
involved are,
• Orthographic projection
• Perspective projection
• Isometric projection
05-Feb-19
M.KUMARASAMY COLLEGE OF
ENGINEERING
5

6. METHODS OF EXPRESSION
IN ENGINEERINNG
GRAPHICS
05-Feb-19
M.KUMARASAMY COLLEGE OF
ENGINEERING
6

7. METHODS OF EXPRESION
• There are three methods of writing graphical
language. They are,
• Freehand drawing
• With hand-held instrument
• By computer
05-Feb-19 7
M.KUMARASAMY COLLEGE OF
ENGINEERING

8. 05-Feb-19 8
M.KUMARASAMY COLLEGE OF
ENGINEERING
ENGINEERING
GRAPHICS
MANUAL
DRAWING
COMPUTER
DRAWING
1.Free hand drawing
2.Hand-held drawing
Auto CAD

9. MANUAL DRAWING
05-Feb-19
M.KUMARASAMY COLLEGE OF
ENGINEERING
9

10. • FREE HAND DRAWING
• Sketching lines without instruments other
than pencils and erasers
05-Feb-19 10
M.KUMARASAMY COLLEGE OF
ENGINEERING

11. • HAND-HELD DRAWING
• Drawings are drawn using instruments
• Represent in a neat manner
• Instruments like scale, compass, protractor, etc,.
Used
• Used for scale
05-Feb-19 11
M.KUMARASAMY COLLEGE OF
ENGINEERING

12. DRAWING INSTRUMENTS USED
IN ENGINEERING GRAPHICS
05-Feb-19
M.KUMARASAMY COLLEGE OF
ENGINEERING
12

13. DRAWING INSTRUMENTS
• Engineering related objects like building,
bridges, machines are represented in size,
shape, materials, etc,.
05-Feb-19 13
M.KUMARASAMY COLLEGE OF
ENGINEERING

14. DRAWING INSTRUMENTS
• Some of the drawing instruments are,
• Drawing board
• Drawing sheets
• Pencils
• Drafter
05-Feb-19
M.KUMARASAMY COLLEGE OF
ENGINEERING
14

15. 05-Feb-19
M.KUMARASAMY COLLEGE OF
ENGINEERING
15
•Compass
•Protractor
•Scale
•Tapes
•Eraser
•Clips etc,.
DRAWING INSTRUMENTS

16. DRAWING BOARD
• Drawings are drawn using this board
• Made up of best seasoned timber
• Top of the board must be flat
05-Feb-19 16
M.KUMARASAMY COLLEGE OF
ENGINEERING

17. DRAWING BOARD TYPES
05-Feb-19
M.KUMARASAMY COLLEGE OF
ENGINEERING
17
DRAWING BOARD LENGTH X WIDTH X THICKNESS (mm)
D0 1500 X 1000 X 25
D1 1000 X 700 X 25
D2 700 X 500 X 15
D3 500 X 350 X 15

18. DRAWING SHEETS
• White papers of good quality drawing sheets
used
• There are 5 types of sheets are used. They are,
A0, A1, A2, A3, A4
• Each type of sheet has different sizes
05-Feb-19 18
M.KUMARASAMY COLLEGE OF
ENGINEERING

19. • Drawing sheet sizes
05-Feb-19 19
M.KUMARASAMY COLLEGE OF
ENGINEERING
Designation Sheet size (mm)
A4 210 X 297
A3 297 X 420
A2 420 X 594
A1 594 X 841
A0 841 X 1188

20. DRAFTER
• Most important tool in engineering drawing
• Performs the function of set square, T-square,
scale and protractor
• Parallel and perpendicular lines are possible
by moving the arms
05-Feb-19 20
M.KUMARASAMY COLLEGE OF
ENGINEERING

21. PENCILS
• Accuracy and neatness of diagram depends on
quality of the pencil used
• 3 variety types of pencil are used. They are,
• HB - for border lines, letterings, etc,.
• H - for dimension lines, centre line, etc,.
• 2H - for projection lines, extension lines, etc,.
05-Feb-19 21
M.KUMARASAMY COLLEGE OF
ENGINEERING

22. LINES
05-Feb-19 22
M.KUMARASAMY COLLEGE OF
ENGINEERING

23. TYPES OF LINES
• The types of lines include,
• Continuous thick
• Continuous thin
• Chain thin
• Dashed Thick
• Chain thin double dashed
05-Feb-19
M.KUMARASAMY COLLEGE OF
ENGINEERING
23

24. • Continuous thick
Used for visible of outlines and edges
• Continuous thin
Used for imaginary lines, intersection
lines, dimension lines, projection line
05-Feb-19 24
M.KUMARASAMY COLLEGE OF
ENGINEERING

25. • Chain thin
_ ___ _ ___ _ Used for centre lines, trajectory
• Dashed thick
_ _ _ _ _ _ _ Used for hidden outlines
05-Feb-19 25
M.KUMARASAMY COLLEGE OF
ENGINEERING

26. COMPUTER DRAWING
05-Feb-19 26
M.KUMARASAMY COLLEGE OF
ENGINEERING

27. AUTOCAD
• Example for computer aided drawing is
AutoCAD
• 2D and 3D computer aided drafting software
application
• Used for making blueprints
05-Feb-19 27
M.KUMARASAMY COLLEGE OF
ENGINEERING

28. AutoCAD Drawing
05-Feb-19
M.KUMARASAMY COLLEGE OF
ENGINEERING
28

29. • In free hand or hand – held drawing error may
occured
• Dimensions are not in accurate points
• In computer aided drafting (AutoCAD) there
wont be any mistakes
• Time taken is less
05-Feb-19
M.KUMARASAMY COLLEGE OF
ENGINEERING
29

30. APPLICATIONS OF
ENGINEERING DRAWING
05-Feb-19
M.KUMARASAMY COLLEGE OF
ENGINEERING
30

31. APPLICATIONS
• Civil Engineering
• For construction of bridges, buildings and for
making maps
• Mechanical Engineering
• For designing machines, bike parts, car parts,
etc,...
05-Feb-19
M.KUMARASAMY COLLEGE OF
ENGINEERING
31

32. APPLICATIONS
• Electronics and Communication
Engineering
• For understanding circuit connections and
component diagrams
05-Feb-19
M.KUMARASAMY COLLEGE OF
ENGINEERING
32

33. THANK YOU
05-Feb-19
M.KUMARASAMY COLLEGE OF
ENGINEERING
33