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Isometric Projection

Isometric projections show all three dimensions of an object in a single view with each dimension shown at equal angles of 120 degrees to each other. Dimensions need to be converted to isometric scale for accurate representation in drawings. An example shows an isometric view drawn from given orthographic views of an object.

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126 views38 pages

Isometric Projection

Isometric projections show all three dimensions of an object in a single view with each dimension shown at equal angles of 120 degrees to each other. Dimensions need to be converted to isometric scale for accurate representation in drawings. An example shows an isometric view drawn from given orthographic views of an object.

Uploaded by

rahul
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Isometric Projections:

It is a type of pictorial projection in which all three dimensions of an


object are shown in one view.
In this, an object is so placed that, its three mutually perpendicular edges are
equally inclined with the plane of projection. So all three dimensional axes appear
at equal inclinations with each other (120o).

b c
Isometric Planes:
The planes representing the faces of the cube are called Isometric Planes.

Isometric scale:
When one holds the object in such a way that all three dimensions are visible then
in the process all dimensions become proportionally inclined to observer’s eye
sight and hence appear apparent in lengths.

In practice, while drawing isometric projection, it is necessary to convert true


lengths into isometric lengths.
D
4

2 C
4

1 3

0
1
450
0 300
A B

Isometric scale ( Line AC ) required for Isometric Projection


A

B D
120o

E C 120o
120o

F H

30o 30o
M G N Base Line
T.V.

F.V. L.H.S.V.

T.V.
T.V

R.H.S.V F.V

T.V
Isometric view if the Shape is
SHAPE
F.V. or T.V.
D
H
RECTANGLE D
A D A
C C
A

B C B B
B
H
TRIANGLE 3 B
ISOMETRIC 1 B 1 3
OF A A
PLANE FIGURES 3
1
2 A 2 2
4
PENTAGON H E
1 E 1
4 D 4
D
E
A D A
1 3
3 A C
C
2 3 B B
B C 2 2
Ellipses can be in any of three planes
34
60

25

L= 60 mm
H= 25 mm X
D= 34 mm
Example 2
Draw isometric drawing from given orthographic view

O
Solution 2
Isometric Projections

SH1131 SEM-II Engineering Graphics


Isometric Projections

SH1131 SEM-II Engineering Graphics


Isometric Projections

SH1131 SEM-II Engineering Graphics


Isometric Projections

SH1131 SEM-II Engineering Graphics


Isometric Projections

SH1131 SEM-II Engineering Graphics


Isometric Projections

SH1131 SEM-II Engineering Graphics


Isometric Projections

SH1131 SEM-II Engineering Graphics


FV 40

X O 10 Y
100
10
25
TV
10 30 10
25
30 R O
20 D
FV
40

10
O
30 D 45

10
50
O

80

TV
HEX PART
30
20
20
40
20

O 50
20
15

O 30
100 60
34
60

25
L= 60 mm
H= 25 mm
D= 34 mm

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