4. Introduction
The purpose of a “Multiview Drawing” is to
represent a three dimensional object on a two
dimensional sheet of paper or in a two
dimensional drawing space.
Multiview Drawings are used by Engineers,
Architects and Contractors to Design and build
tiny objects such as microchips or large objects
such as buildings, shopping centers, bridges etc.
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6. Bus is represented by six views, the
front, top, sides, back and bottom.
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7. Orthographic Projections
Ortho is a Greek word, which means “Perpendicular”.
Orthographic Projections – here the line of sight is perpendicular
to the viewer.
By definition, for each element of a orthographic projection drawing
you required three dimensions.
Height (H)
Width (W) / Length (L)
Depth (D)
But while drawing, only two of the three dimensions can be shown.
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8. 6 Principle Views
The 6 principle views are created by looking at the object,
straight on, in the directions indicated.
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9. Orthographic Projection Views
When constructing an orthographic projection, we need to include
enough views to completely describe the true shape of the part.
Complex part = more views
Simple part = less views
The standard views used in an orthographic projection are;
Front view
Top view
Side view (Right or Left Side View)
The remaining 3 views usually don’t add any new information.
Always pick the view which will help in describing the object with
highest clarity.
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10. Projection Method
Third angle projection is normally used in the US while Europe uses the
First Angle projection.
Note the symbols at the bottom of each one will tell you which projection
that you are viewing.
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Third-angle
Projection
First-angle
Projection
12. Each of the view show only 2 out of 3
dimensions (Height, Length, Depth)
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13. Glass Box Approach..!!!
Most powerful technique to understand orthographic
projections is a method known as Glass Box Approach.
Here the object is suspended inside the transparent glass box
with the help of strings.
After this the views are freeze from each direction,
(each of the six sides of the box).
At the end the box is unfold to get the views.
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14. The object is placed & image is
projected on the sides of a box.
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15. The box is unfolded & three views are
visible on plane of paper.
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17. View Alignment
The front and top views are aligned vertically and share the
same width dimension.
The front and side views are aligned horizontally and share the
same height dimension.
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