The document discusses engineering drawing tools and techniques. It provides details on traditional drawing tools like T-squares, triangles, pencils in different grades, templates, and erasers. It also covers topics like freehand sketching, geometric constructions for circles and arcs, line types, lettering, orthographic projections, and drawing standards. Orthographic projections produce multi-view or axonometric drawings to accurately depict an object's shape and size from different angles according to established technical drawing conventions and standards.
Download link: https://www.researchgate.net/publication/318852873_Engineering_Drawing_-_I
DOI: 10.13140/RG.2.2.22512.56328
An engineering drawing is a type of technical drawing, used to fully and clearly define requirements for engineered items, and is usually created in accordance with standardized conventions for layout, nomenclature, interpretation, appearance size, etc.
Its purpose is to accurately and unambiguously capture all the geometric features of a product or a component. The end goal of an engineering drawing is to convey all the required information that will allow a manufacturer to produce that component.
Download link: https://www.researchgate.net/publication/318852873_Engineering_Drawing_-_I
DOI: 10.13140/RG.2.2.22512.56328
An engineering drawing is a type of technical drawing, used to fully and clearly define requirements for engineered items, and is usually created in accordance with standardized conventions for layout, nomenclature, interpretation, appearance size, etc.
Its purpose is to accurately and unambiguously capture all the geometric features of a product or a component. The end goal of an engineering drawing is to convey all the required information that will allow a manufacturer to produce that component.
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11. Straight Line
1. Hold the pencil naturally.
2. Spot the beginning and end points.
3. Swing the pencil back and forth between the points, barely
touching the paper until the direction is clearly established.
4. Draw the line firmly with a free and easy wrist-and-arm
motion
14. Small Circle
Method 1 : Starting with a square
1. Lightly sketching the square and marking the mid-points.
2. Draw light diagonals and mark the estimated radius.
3. Draw the circle through the eight points.
Step 1 Step 2 Step 3
15. Method 2 : Starting with center line
Step 1 Step 2 Step 3
1. Lightly draw a center line.
2. Add light radial lines and mark the estimated radius.
3. Sketch the full circle.
Small Circle
16. Arc
Method 1 : Starting with a square
Method 2 : Starting with a center line
17. Basic Strokes
Straight Slanted CurvedHorizontal
1 1 2
3
Examples : Application of basic stroke
“I” letter “A” letter 1
2
3
4 5
6
“B” letter
19. The text’ s body height is about 2/3 the height of a capital
letter.
Suggested Strokes SequenceLower-case letters
20. GOOD
Not uniform in style.
Not uniform in height.
Not uniformly vertical or inclined.
Not uniform in thickness of stroke.
Area between letters not uniform.
Area between words not uniform.
Example : Good and Poor Lettering
21. 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
OUNLESS
OTHERWISE SPECIFIED.O
23. 1. Try to write a description of
this object.
2. Test your written description
by having someone attempt
to make a sketch from your
description.
Effectiveness of Graphics Language
The word languages are inadequate for describing the
size, shape and features completely as well as
concisely.
You can easily understand that …
24. Graphic language use lines to represent the surfaces,
edges and contours of objects.
A drawing can be done using freehand, instruments
or computer methods.
Composition of Graphic Language
The language is known as “drawing” or “drafting” .
25. Freehand drawing
The lines are sketched without using instruments other
than pencils and erasers.
Example
26. Instrument drawing
Instruments are used to draw straight lines, circles, and
curves concisely and accurately. Thus, the drawings are
usually made to scale.
Example
29. Elements
Drawing comprises of graphics language
and word language.
Graphics
language
Describe a shape
(mainly).
Word
language
Describe size, location and
specification of the object.
30. Basic Knowledge for Drafting
Graphics
language
Word
language
Line
types
Geometric
construction Lettering
Projection
method
33. PROJECTION THEORY
The projection theory is based on two variables:
1) Line of sight
2) Plane of projection (image plane or picture plane)
The projection theory is used to graphically represent
3-D objects on 2-D media (paper, computer screen).
34. Line of sight is an imaginary ray of light between an
observer’s eye and an object.
Line of sight
Parallel projection
Line of sight
Perspective projection
There are 2 types of LOS : parallel convergeand
35. Plane of projection is an imaginary flat plane which
the image is created.
The image is produced by connecting the points where
the LOS pierce the projection plane.
Parallel projection Perspective projection
Plane of projection Plane of projection
38. 5
Orthographic projection is a parallel projection technique
in which the parallel lines of sight are perpendicular to the
projection plane
MEANING
Object views from top
Projection plane
1
2
3
4
51 2 3 4
39. ORTHOGRAPHIC VIEW
Orthographic view depends on relative position of the object
to the line of sight.
Two dimensions of an
object is shown.
Three dimensions of an object is shown.
Rotate
Tilt
More than one view is needed
to represent the object.
Multiview drawing
Axonometric drawing
40. Orthographic projection technique can produce either
1. Multiview drawing
that each view show an object in two dimensions.
2. Axonometric drawing
that show all three dimensions of an object in one view.
Both drawing types are used in technical drawing for
communication.
NOTES
ORTHOGRAPHIC VIEW
41. Axonometric (Isometric) Drawing
Easy to understand
Right angle becomes obtuse angle.
Circular hole
becomes ellipse.
Distortions of shape and size in isometric drawing
Advantage
Disadvantage Shape and angle distortion
Example
43. Multiview Drawing
It represents accurate shape and size.Advantage
Disadvantage Require practice in writing and reading.
Multiviews drawing (2-view drawing)Example
53. Basic Line Types
Types of Lines Appearance
Name according
to application
Continuous thick line Visible line
Continuous thin line Dimension line
Extension line
Leader line
Dash thick line Hidden line
Chain thin line Center line
54. Visible lines represent features that can be seen in the
current view
Meaning of Lines
Hidden lines represent features that can not be seen in
the current view
Center line represents symmetry, path of motion, centers
of circles, axis of axisymmetrical parts
Dimension and Extension lines indicate the sizes and
location of features on a drawing
57. Exercise
• Complete three orthographic views of the
object shown on the next slide.
• Include visible, hidden, and center lines
where appropriate.
• You will be given 7 minutes.
61. Introduction
Standards are set of rules that govern how technical
drawings are represented.
Drawing standards are used so that drawings convey
the same meaning to everyone who reads them.
62. 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
63. Partial List of Drawing Standards
JIS Z 8311 Sizes and Format of Drawings
JIS Z 8312 Line Conventions
JIS Z 8313 Lettering
JIS Z 8314 Scales
JIS Z 8315 Projection methods
JIS Z 8316 Presentation of Views and Sections
JIS Z 8317 Dimensioning
Code number Contents
64. Drawing Sheet
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)
65. Drawing space Drawing
space
Title block
d
d
c
c
c
Border
lines
1. Type X (A0~A4) 2. Type Y (A4 only)
Orientation of drawing sheet
Title block
Sheet size c (min) d (min)
A4 10 25
A3 10 25
A2 10 25
A1 20 25
A0 20 25
66. Drawing Scales
Scale is the ratio of the linear dimension of an element
of an object shown in the drawing to the real linear
dimension of the same element of the object.
Size in drawing Actual size
Length, size
:
67. Drawing Scales
Designation of a scale consists of the word “SCALE”
followed by the indication of its ratio, as follow
SCALE 1:1 for full size
SCALE X:1 for enlargement scales
SCALE 1:X for reduction scales