O

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O
O
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Draw the isometric view from the two views given
FV
TV
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DRAW ISOMETRIC VIEW OF A CIRCLE IF IT IS A TV OR
FV. FIRST ENCLOSE IT IN A SQUARE. DRAW A RHOMBUS
REPRESENTING THE SQUARE IN ISOMETRIC FOUR CENTER
METHOD JOIN OBTUSE ANGLE CORNERS TO THE MID
POINT OF THE OPPOSITE SIDES 4 CENTERS ARE 1, 2,
3, AND 4 AS SHOWN WITH 1 AND 2 AS CENTERS, DRAW
ARCS AB AND DC WITH 3 AND 4 AS CENTERS, DRAW ARCS
AD AND BC
2
2
4
3
4
3
1
1
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Isometric view of circle Method of points
l
d
k
8
k
a
d
8
j
j
4
e
1
l
a
4
1
e
7
5
7
i
3
2
f
3
i
5
c
2
g
h
c
b
h
6
f
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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
g
b
4 points can be obtained as the end points of the
diameters drawn parallel to the axes
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DRAW ISOMETRIC VIEW OF THE FIGURE SHOWN WITH
DIMENTIONS (ON RIGHT SIDE) CONSIDERING IT FIRST
AS horizontal AND THEN vertical
IF FRONT VIEW
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Draw a cylinder of height 50 mm and diameter 30
mm i) With axis horizontal, ii) With axis vertical
CYLINDER WITH AXIS VERTICAL
CYLINDER WITH AXIS HORIZONTAL
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ISOMETRIC VIEW OF A
FRUSTOM OF CONE STANDING ON H.P. ON
ITS LARGER BASE.
FV
TV
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Construction
Final
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Isometric view of a sphere

• All 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)

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Sphere resting on a square platform
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.
P1
Sphere is touching the platform at P and not P1
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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
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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

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ISOMETRIC VIEW OF PENTAGONALL PRISM WITH AXIS
HORIZONTAL
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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
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HALF CYLINDER STANDING ON H.P. ( ON ITS
SEMICIRCULAR BASE)
HALF CYLINDER LYING ON H.P. ( with flat face //
to H.P.)
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ISOMETRIC VIEW OF FRUSTOM OF PENTAGONAL PYRAMID
PROJECTIONS OF FRUSTOM OF PENTAGONAL PYRAMID ARE
GIVEN. DRAW ITS ISOMETRIC VIEW.