engineering drawing an introduction. engineering drawing importance
TRANSCRIPT
Engineering Drawing
An Introduction
Engineering Drawing
Importance
Graphic Language & Effectiveness
Try writing the description of these pictures……………
Graphic Language & Effectiveness
And let someone attempt to make a sketch or visualize from your description.
………………..………Or these pictures
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
Engineering Drawing
Process
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 sketchesused 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
Problem Definition
Exploration of Ideas
Design
Analysis
Refinement and Optimization
Implementation
Visualize
Sketches
Geometric model
Detail drawings& 3D model
Engineering Drawing In Design Process
Design
Analysis
Refinement and Optimization
Implementation
Visualize
Sketches
Geometric model
Detail drawings& 3D model
Engineering Drawing In Design Process
Problem Definition
Exploration of Ideas
Analysis
Refinement and Optimization
Implementation
Visualize
Sketches
Geometric model
Detail drawings& 3D model
Engineering Drawing In Design Process
Problem Definition
Exploration of Ideas
Design
Refinement and Optimization
Implementation
Visualize
Sketches
Geometric model
Detail drawings& 3D model
Engineering Drawing In Design Process
Problem Definition
Exploration of Ideas
Design
Analysis
Visualize
Sketches
Geometric model
Detail drawings& 3D model
Engineering Drawing In Design Process
Problem Definition
Exploration of Ideas
Design
Refinement and Optimization
Analysis
Implementation
Visualize
Sketches
Geometric model
Detail drawings& 3D model
Engineering Drawing In Design Process
Problem Definition
Exploration of Ideas
Design
Implementation
Analysis
Refinement and Optimization
Engineering Drawing
Standards
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
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
Engineering Drawing
Drawing Sheet
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)
Drawing space
Title block
dBorder lines
Drawing Sheet : Orientation & Margin
A3 297 x 420
Engineering Drawing
Drawing Scale
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
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.
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
Engineering Drawing
Lettering
- 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 inthickness of stroke.
Inappropriate spacebetween letters
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.
Basic Strokes
Straight Slanted CurvedHorizontal
1 1 2
3
“I” letter “A” letter
1
2
3
4 5
6
“B” letter
Examples
Leave the space between words equal to the spacerequires for writing a letter “O”.
Example
Sentence Composition
ALL DIMENSIONS ARE INMILLIMETERS
O O OOUNLESS
OTHERWISE SPECIFIED.O
Engineering Drawing
Line Types
Basic Line Types &Application
Continuous
DashChain
Style
Thickness Thick Thin 1. Dimension line2. Extension line3. 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
Basic Line Types An Example
Basic Line Types