1) The document discusses drawing isometric views of various geometric solids and objects from given orthographic views or descriptions. 2) Methods for drawing isometric views include using a triangular pyramid cut by an inclined plane as an example, drawing cones and frustums of cones cut by inclined planes, and constructing isometric views from given orthographic projections. 3) Techniques like the four centre method and using reference circles are described for accurately constructing isometric views of objects that are sections of solids or have curved surfaces.

1. ISOMETRIC VIEW
M. Sundra Pandian, M.E., M.B.A.
Asst. Professor, Department of Mechanical Engineering,
Sri Ramakrishna Institute of Technology,
Coimbatore - 64010

2. 4’
4
1
Frustum
x y
a
c
d
e
f
b
o
o’
a’ b’ c’ d’
(e’)
(f’)
1’
2’ 3’(5’)
(6’)
1
2 3
4
5
6
p q
r
s
p’ q’
7’ 8’
q’
p’ r’
30°
30°
s’
8’
7’
10’
9’
B
C D
E
F
A
2
3
5
6

3. E
b
a
c
3
3
1
Truncated Solids
Draw the isometric view of a triangular pyramid of base side 30 mm and height 60
mm resting on its base on H.P., such one of its base edge is parallel to V.P. It is cut by a
plane perpendicular to V.P. and inclined at an angle of 45° to H.P. , bisecting the axis.
x y
e f
a’ b’
g’ h’
o
o’
c’
1’
3’
2’
F
C
H
G
I
J
A
O
2
1
B
3
O’

4. H
1’
2’ (8’)
3’ (7’)
4’ (6’) 5’
1
2
8 7
3
5
4
6
Section of Cone
Draw the isometric view of a right circular cone of base diameter 50 mm and height
80 mm resting on its base on h.p. and axis parallel to v.p. it is cut by a plane perpendicular to
v.p. and inclined at an angle of 60° to h.p. at a point on the axis 50 mm above the base
x y
a
b
c
d
e
f
g
h
p q
r
s
a’ e’
o
o’
V
U
W
T
Q
R
P
S
O’
1
O
A C
E
G
F
D
B
Method of Points

5. Section of Cylinder
Draw the isometric view of a frustum cone of base diameter 60 mm and
height 70 mm with a sphere of diameter 40 mm placed centrally above it.
x y
a
b
c
d
e
f
g
h
p q
r
s
a’ e’
o
o’
O’
H O
A C
E
G
F
D
B
Four Centre Method
5’
2’(8’)
1’
3’ (7’)
4’(6’)
P
Q
R
S
O’’
R1 R2
R3
R4
R1 for arc ‘AHG’ R2 for arc ‘CDE’
R3 for arc ‘GFE’ R4 for arc ‘ABC’

6. Orthographic to Isometric
Draw the isometric view for the given Orthographic views.

7. Orthographic to Isometric
Draw the isometric view for the given Orthographic views.

8. Orthographic to Isometric
Draw the isometric view for the given Orthographic views.

9. Orthographic to Isometric
Draw the isometric view for the given Orthographic views.

10. Orthographic to Isometric
Draw the isometric view for the given Orthographic views.

11. Orthographic to Isometric
Draw the isometric view for the given Orthographic views.