1

O

F.V. and S.V.of an object are given. Draw it’s isometric view.

40 20

30 SQUARE

20

50

60

30

10

F.V.L.S.V.

O O

FV

TV

Draw the isometric view from the two views given

3

41

4

2

3

A B

D C

1

4

2

3A

BD

C

DRAW ISOMETRIC VIEW OF A CIRCLE IF IT IS A TV OR FV.

FIRST ENCLOSE IT IN A SQUARE.DRAW A RHOMBUS REPRESENTING THESQUARE IN ISOMETRICFOUR CENTER METHODJOIN OBTUSE ANGLE CORNERS TO THE MID POINT OF THE OPPOSITE SIDES4 CENTERS ARE 1, 2, 3, AND 4 AS SHOWNWITH 1 AND 2 AS CENTERS, DRAW ARCS AB AND DCWITH 3 AND 4 AS CENTERS, DRAW ARCS AD AND BC

5

Isometric view of circle – Method of points

a

e

i

g

f

h

d

cb

j

l k

a

d

c

b

1 4

32

e

l

1

2

4

3

Draw diagonals of the enclosing square

Mark points 1, 2, 3, 4 on the circle and measure their distances from the edges of the rectangle

Mark corresponding distances in the isometric view to obtain the points 1,2, 3, 4

j

k

gf

i

h

4 points can be obtained as the end points of the diameters drawn parallel to the axes

57

6

8

5

7

6

8

6

25 R

100 MM

50 MM

DRAW ISOMETRIC VIEW OF THE FIGURE SHOWN WITH DIMENTIONS (ON RIGHT SIDE) CONSIDERING IT FIRST AS horizontal AND THEN vertical

IF TOP VIEW

IF FRONT VIEW

CYLINDER WITH AXIS HORIZONTAL

CYLINDER WITH AXIS VERTICAL

Draw a cylinder of height 50 mm and diameter 30 mmi) With axis horizontal, ii) With axis vertical

ISOMETRIC VIEW OF A FRUSTOM OF CONE STANDING

ON H.P. ON IT’S LARGER BASE.

FV

TV

40 20

60

X Y

9

Construction

Final

10

40

10

50

80

10

30

25

FV

TV

O

O

F.V. & T.V. of an object are given. Draw it’s isometric view.

11

Isometric view of a sphereAll orthographic views of a sphere are a circle with radius = radius of the sphere

When drawing the isometric view from the 3 orthographic views, we therefore get 3 ellipses as shown

The isometric view is therefore drawn as a circle enclosing the 3 ellipses

The circle radius is approximately 1.22 times the actual sphere radius

Therefore when we draw an isometric view which includes a spherical feature, we either draw the sphereical feature with 1.22 x radius and rest normal size OR

We draw the circle normal size and decrease the rest of the figure (0.82 times)

12

The following figures show the orthographic and isometric views of a sphere resting on a square platform.

The isometric view of the sphere is shown. Spherical scale, is used to obtain the radius of the sphere in isometric view.

The square platform in the isometric view is drawn using the original dimensions.

Note the point of contact P of the sphere with the platform which is the point of intersection of the diagonals of the square.

Sphere resting on a square platform

P1

Sphere is touching the platform at P and not P1

Sphere with normal radius

The rectangular slab has a shortened length of side.

Sphere radius Other dimensions

1.22 times Normal

Normal 0.82 times

14

NOTE

• In this course:– No hidden lines are to be drawn in an isometric

view– No dimensioning is to be done on an isometric

view– Orthographic views are convenient for marking

dimensions and viewing all features of an object– Isometric views are for getting an idea of how the

object will look in 3-D

15

O

O

20

2015

30

6030

20

20

40

100

50

HEX PART

F.V. and S.V.of an object are given. Draw it’s isometric view.

O

16

H

L

1

2

3

4

A

B

C

D

E

ISOMETRIC VIEW OF PENTAGONALL PRISM WITH AXIS HORIZONTAL

1

2 3

4

A

B C

D

E

50

PROBLEM: A SQUARE PYRAMID OF 30 MM BASE SIDES AND 50 MM LONG AXIS, IS CENTRALLY PLACED ON THE TOP OF A CUBE OF 50 MM LONG EDGES.DRAW ISOMETRIC VIEW OF THE PAIR.

50

30

HALF CYLINDER LYING ON H.P.

( with flat face // to H.P.)

HALF CYLINDER STANDING ON H.P.

( ON IT’S SEMICIRCULAR BASE)

ISOMETRIC VIEW OF

FRUSTOM OF PENTAGONAL PYRAMID

4020

60

1

2 3

4

y

A

B

C

D

E

40 20

60

x

FV

TV

PROJECTIONS OF FRUSTOM OF PENTAGONAL PYRAMID ARE GIVEN.

DRAW IT’S ISOMETRIC VIEW.

SOLUTION STEPS:

FIRST DRAW ISOMETRIC OF IT’S BASE.

THEN DRAWSAME SHAPE AS TOP, 60 MM ABOVE THE BASE PENTAGON CENTER.

THEN REDUCE THE TOP TO 20 MM SIDES AND JOIN WITH THE PROPER BASE CORNERS.