1. Engineering Drawing
An Introduction

2. Engineering Drawing
Importance

3. Graphic Language & Effectiveness
Try writing the description of these pictures……………

4. Graphic Language & Effectiveness
………………..………Or these pictures
And let someone attempt to make a sketch or visualize from your description.

5. Graphic Language & Effectiveness
It can be found that …
The word language is
inadequate
for describing the
size, shape and features
completely as well as concisely.

6. Engineering Drawing
Process

7. Engineering Drawing In Design Process
Visualization
is the ability to mentally picture things that do not exist
Problem identification
& exploration of ideas
Visualize
Draw , design and record initial ideas
Sketches
Communication
the design solution should be communicated to others without ambiguity
Created from sketches
used or analysis
Geometric model
Refine, optimize
& record the precise data for production process or implementation
Detail drawings
&
3D model
Documentation
permanent record of the solution

8. Engineering Drawing In Design Process
Problem Definition
Visualize
Exploration of Ideas
Sketches
Design
Geometric
model
Analysis
Refinement and Optimization
Detail drawings
& 3D model
Implementation

9. Engineering Drawing In Design Process
Problem Definition
Visualize
Exploration of Ideas
Sketches
Design
Geometric
model
Analysis
Refinement and Optimization
Detail drawings
& 3D model
Implementation

10. Engineering Drawing In Design Process
Problem Definition
Visualize
Exploration of Ideas
Sketches
Design
Geometric
model
Analysis
Refinement and Optimization
Detail drawings
& 3D model
Implementation

11. Engineering Drawing In Design Process
Problem Definition
Visualize
Exploration of Ideas
Sketches
Design
Geometric
model
Analysis
Refinement and Optimization
Detail drawings
& 3D model
Implementation

12. Engineering Drawing In Design Process Refinement and Optimization
Problem Definition
Visualize
Exploration of Ideas
Sketches
Design
Geometric
model
Analysis
Refinement and Optimization
Detail drawings
& 3D model
Implementation

13. Engineering Drawing In Design Process
Problem Definition
Visualize
Exploration of Ideas
Sketches
Design
Geometric
model
Analysis
Refinement and Optimization
Detail drawings
& 3D model
Implementation

14. Engineering Drawing
Standards

15. Standards Definition Why Necessary
Drawing standards are set of rules that govern how technical drawings are represented.
Why Necessary
Drawing standards are used so that drawings convey
the same meaning to everyone who reads them.

16. Standard Code Country Code Full name ANSI
American National Standard Institute
USA
JIS
Japanese Industrial Standard
Japan BS
British Standard UK AS
Australian Standard
Australia
Deutsches Institut für Normung
DIN
Germany
ISO
International Standards Organization

17. Engineering Drawing
Drawing Sheet

18. Drawing Sheet : Standard size
Trimmed paper of
a size A0 ~ A4. A4 A3
Standard sheet size (JIS)
A x 297
A x 420
A x 594
A x 841
A x 1189 A2 A1 A0
(Dimensions in millimeters)

19. Drawing Sheet : Orientation & Margin
Border
lines
A x 420
Drawing space
Title block

20. Engineering Drawing
Drawing Scale

21. Drawing Scales : Definition
Length, size
Scale is a ratio between the linear dimension of a drawn representation of an object and the actual object. : 1 2 10 20
Drawing
Actual

22. Drawing Scales : Designation
Designation of a scale consists of the word “SCALE”
followed by the indication of its ratio, as follows
SCALE 1:1 for full size
SCALE X:1 (X > 1) for an enlargement scales
SCALE 1:X (X > 1) for a reduction scales
Drawing scale is commonly found in a title block.

23. Drawing Scales : Standard scale
Standard reducing scales are
1:2, 1:5, 1:10, 1:20, 1:50, 1:100
Standard enlarging scales are
2:1, 5:1, 10:1, 20:1, 50:1, 100:1

24. Engineering Drawing
Lettering

25. Recommendation Text’s style on the drawing Examples
must have the following
2 properties
Examples
GOOD
Not uniform in style.
Legibility
- Shape
Space between letters
Space between words
Not uniform in height.
Not uniformly vertical.
Uniformity
Not uniform in
thickness of stroke.
- Size (or text height) - line thickness
Inappropriate space
between letters

26. Style (this course) Gothic vertical style.
Begin the sentence, phrase or word with a capital letter.
Text height 2~3 mm.
Space between lines of text is about of text height.
Height of the lower-case letter is about 2/3 of that of a
capital letter.

27. Basic Strokes Straight Slanted Horizontal Curved Examples “I” letter
“A” letter
“B” letter 4 5 1 1 1 2 6 3 3 2

29. Sentence Composition ALL O DIMENSIONS O ARE O IN MILLIMETERS O UNLESS
Leave the space between words equal to the space requires for writing a letter “O”.
Example
ALL O
DIMENSIONS O
ARE O IN
MILLIMETERS O
UNLESS
OTHERWISE O
SPECIFIED.

30. Engineering Drawing
Line Types

31. Basic Line Types &Application
Thickness
1. Dimension line
2. Extension line
3. Leader line
Thick
Thin
Visible line
Style
Continuous
Hidden line
Dash
Chain
Center line
1. Visible line
represent features that can be seen in the current view.
2. Dimension line
Extension line
Leader line
indicate the sizes and location of features.
3. Hidden line
represent features that can not be seen in the current view.
4. Center line
represents symmetry, path of motion, centers of circles,
axis of axisymmetrical parts

32. Basic Line Types An Example

33. Basic Line Types