Title: An Introduction to Orthographic and Isometric Projection in Engineering Drawing
1(No Transcript)
2A 3D Picture Rigid Shaft Coupling
3How to represent such complicated 3D objects on
2D Drawing sheets ?
The Answer is the Different Methods of
Engineering Drawing
4The 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
5Orthographic Projection of the Rigid Shaft
Coupling shown in slide 1
6What is Engineering Drawing
7What is Engineering Drawing
8Types of Lines
9Curves Needed to Learn by Beginners
Involute
10Curves Needed to Learn by Beginners
Archimidian Spiral
11Types of Projections
12Orthographic 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.
13Principal Planes Horizontal
14Principal Planes Vertical
15Principal Planes Profile
163 Principal Planes Combined
Rays of light
17Projection of a Point
A
Rays of light
18Projection of a Point
P
A
V
A
A
A
H
19Projection on 3 principal planes
203 views of a point
21Projection of a Line
A
B
22Projection of an Oblique Line 3 Views
23Projections of a Horizontal Line
A
B
24Projection 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
253 Views of a line Frontal Line
261st Angle Projection Solid
27Projection of a solid
283 views of a solid 1st angle
PP
GL
29Projection of a solid
30Views in 4 Quadrants
31Views in 4 Quadrants
No to lt2
32Views in 4 Quadrants
33Views in 4 Quadrants
No to lt4
343rd Angle Projection Solid
353rd Angle Projection
36Multi-view Projections
37Multi-view Projections
38First Angle Third Angle conventions
1st Angle
3rd Angle
392 Views of a Cone
402 Views of a Hexagonal Prism
412 Views of a Solid
423 Views of a Solid
43Sectional Views
44Passing Sectional Plane
Object after section
Full Sectional Front View
Throw away the front part
A
A
A
Top View
45Full Sectional F-View
46Full Sectional Front View
Sectional F-View
F
T-View
47Half Sectional Front View
Sectional F-View
T-View
48Isometric 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".
49Isometric Projection
50Isometric 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.
51Isometric 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.
52Isometric Circle
53Isometric Projection
54Isometric Dimension
55Cotter Joint
56THANK YOU