3. Graphic Language & Effectiveness
Try writing the description of these
pictures……………
4. Graphic Language & Effectiveness
And let someone attempt to make a sketch or visualize
from your description.
………………..………Or these pictures
5. The word language is
inadequate
for describing the
sizesize, shapeshape and featuresfeatures
completely as well as concisely.
It can be found that …
Graphic Language & Effectiveness
7. Engineering Drawing
In Design Process
Problem identification
& exploration of ideas
Visualize
Sketches
Geometric model
Detail drawings
&
3D model
Draw , design and
record initial ideas
Created from sketches
used or analysis
Refine, optimize
& record the precise
data for production
process or
implementation
Visualization
is the ability to mentally
picture things that do not
exist
Communication
the design solution
should be communicated
to others without
ambiguity
Documentation
permanent record of the
solution
8. Problem Definition
Exploration of Ideas
Design
Analysis
Refinement and
Optimization
Implementation
Visualize
Sketches
Geometric
model
Detail drawings
& 3D model
Engineering Drawing
In Design Process
15. Standards Definition
Drawing standards are set of rulesset of rules that govern how
technical drawings are represented.
Drawing standards are used so that drawings conveyconvey
the same meaningthe same meaning to everyone who reads them.
Why Necessary
16. ISO International Standards Organization
Standard Code
ANSI American National Standard InstituteUSA
JIS Japanese Industrial StandardJapan
BS British StandardUK
AS Australian StandardAustralia
Deutsches Institut für NormungDINGermany
Country Code Full name
18. Drawing Sheet : Standard size
Trimmed paper of
a size A0 ~ A4.
Standard sheet size
(JIS)
A4 210 x 297
A3 297 x 420
A2 420 x 594
A1 594 x 841
A0 841 x 1189
A4
A3
A2
A1
A0
(Dimensions in millimeters)
21. Drawing Scales : Definition
Drawing Actual
Length, size
:
ScaleScale is a ratio between the linear dimension of a
drawn representation of an object and the actual object.
1 2
20
10
22. 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 enlargementenlargement scales
SCALE 1:X (X > 1) for a reductionreduction scales
Drawing Scales : Designation
Drawing scale is commonly found in a title block.
23. Standard reducing scales are
1:2, 1:5, 1:10, 1:20, 1:50, 1:100
Drawing Scales : Standard scale
Standard enlarging scales are
2:1, 5:1, 10:1, 20:1, 50:1, 100:1
25. - Size (or text height)
- line thickness
- Shape
- Space between letters
- Space between words
Recommendation
LegibilityLegibility
UniformityUniformity
Text’s style on the drawing
must have the following
2 properties
Examples
GOOD
Not uniform in style.
Not uniform in height.
Not uniformly vertical.
Not uniform in
thickness of stroke.
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.
29. Leave the space between words equal to the space
requires for writing a letter “O”.
Example
Sentence Composition
ALL DIMENSIONS ARE IN
MILLIMETERS
O O O
O UNLESS
OTHERWISE SPECIFIED.O
31. Basic Line Types &Application
Continuous
Dash
Chain
Style
Thickness Thick Thin 1. Dimension line
2. Extension line
3. Leader line
Center line
Hidden line
Visible line
represent features that can be seen in the current view.
represent features that can not be seen in the current view.
represents symmetry, path of motion, centers of circles,
axis of axisymmetrical parts
indicate the sizes and location of features.
1. Visible line
3. Hidden line
4. Center line
2. Dimension line
Extension line
Leader line
