An Introduction to Orthographic and Isometric Projection in Engineering Drawing - PowerPoint PPT Presentation

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Title: An Introduction to Orthographic and Isometric Projection in Engineering Drawing


1
(No Transcript)
2
A 3D Picture Rigid Shaft Coupling
3
How to represent such complicated 3D objects on
2D Drawing sheets ?
The Answer is the Different Methods of
Engineering Drawing
4
The present show aims at demonstrating methods of
Engineering Drawing that are generally learnt by
students of diploma graduate engineering
students. Orthographic projection is one such
method
5
Orthographic Projection of the Rigid Shaft
Coupling shown in slide 1
6
What is Engineering Drawing
7
What is Engineering Drawing
8
Types of Lines
9
Curves Needed to Learn by Beginners
Involute
10
Curves Needed to Learn by Beginners
Archimidian Spiral
11
Types of Projections
12
Orthographic Projection
  • The orthographic projection shows the object as
    it looks from the front, right, left, top,
    bottom, or back, and are typically positioned
    relative to each other according to the rules of
    either first-angle or third-angle projection.
  • The origin and vector direction of the
    projectors, also called projection lines, differs.

13
Principal Planes Horizontal
14
Principal Planes Vertical
15
Principal Planes Profile
16
3 Principal Planes Combined
Rays of light
17
Projection of a Point
A
Rays of light
18
Projection of a Point
P
A
V
A
A
A
H
19
Projection on 3 principal planes
20
3 views of a point
21
Projection of a Line
A
B
22
Projection of an Oblique Line 3 Views
23
Projections of a Horizontal Line
A
B
24
Projection of a Frontal Line
AB is parallel to Front plane, called Frontal
Line. Other similar lines are Horizontal
Profile lines.
True lengths are obtained.
True lengths are obtained for these lines.
B
25
3 Views of a line Frontal Line
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1st Angle Projection Solid
27
Projection of a solid
28
3 views of a solid 1st angle
PP
GL
29
Projection of a solid
30
Views in 4 Quadrants
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Views in 4 Quadrants
No to lt2
32
Views in 4 Quadrants
33
Views in 4 Quadrants
No to lt4
34
3rd Angle Projection Solid
35
3rd Angle Projection
36
Multi-view Projections
37
Multi-view Projections
38
First Angle Third Angle conventions
1st Angle
3rd Angle
39
2 Views of a Cone
40
2 Views of a Hexagonal Prism
41
2 Views of a Solid
42
3 Views of a Solid
43
Sectional Views
44
Passing Sectional Plane
Object after section
Full Sectional Front View
Throw away the front part
A
A
A
Top View
45
Full Sectional F-View
46
Full Sectional Front View
Sectional F-View
F
T-View
47
Half Sectional Front View
Sectional F-View
T-View
48
Isometric projection
  • The isometric projection show the object from
    angles in which the scales along each axis of the
    object are equal.
  • Isometric projection corresponds to rotation of
    the object by 45 about the vertical axis,
    followed by rotation of approximately 35.264
    arcsin(tan(30)) about the horizontal axis
    starting from an orthographic projection view.
  • "Isometric" comes from the Greek for "same
    measure".

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Isometric Projection
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Isometric projections
  • The projection is obtained on a plane which is
    equally inclined to all three principal planes
  • Isometric projections and Isometric drawings are
    represented on plane paper by drawing Isometric
    axes, Isometric lines and Isometric planes.

51
Isometric projections
When a cube is kept in a particular position then
it gives Isometric axes, Isometric lines and
Isometric planes. Particular position When a
cube is resting on HP on corner G and diagonal EC
is perpendicular to VP.
CB, CD, CG meeting at C making an angle 120 deg
are Isometric axes. Lines parallel to Isometric
axes are isometric lines, planes representing the
faces are isometric planes.
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Isometric Circle
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Isometric Projection
54
Isometric Dimension
55
Cotter Joint
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