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GE 8152 - ENGINEERING GRAPHICS
Dr.R.Ganesamoorthy.
Professor / Mechanical Engineering.
Chennai Institute of Technology.
GE8152- ENGINEERING GRAPHICS UNIT-1 ORTHOGRAPHIC PROJECTION
UNIT-1 ORTHOGRAPHIC PROJECTION
GE8152- ENGINEERING GRAPHICS UNIT-1 ORTHOGRAPHIC PROJECTION
In orthographic projections, the principle views  Front view, Top view, & Side views
of an object are drawn by the direct observation.
These views are drawn from the pictorial view of an object. The pictorial view is a
three dimensional representation.
By observing pictorial view, it is very easy to visualize the shape when the object is
viewed from front, top & sides.
Multi-view drawings provide the most accurate description of 3D objects and
structures for engineering, manufacturing, and construction requirements
GE8152- ENGINEERING GRAPHICS UNIT-1 ORTHOGRAPHIC PROJECTION
In engineering, there are two systems of projection:
First Angle Projection  Europe, Asia and former European colonies in Africa and
parts of Australia
Third Angle Projection  Used in the USA and Canada, in Africa where American
development is taking place and parts of Australia
GE8152- ENGINEERING GRAPHICS UNIT-1 ORTHOGRAPHIC PROJECTION
Conventional Projections:
GE8152- ENGINEERING GRAPHICS UNIT-1 ORTHOGRAPHIC PROJECTION
ORTHOGRAPHIC PROJECTIONS :
GE8152- ENGINEERING GRAPHICS UNIT-1 ORTHOGRAPHIC PROJECTION
ORTHOGRAPHIC PROJECTIONS :
Views What Seen
Front view Length and Height(width not consider)
Top view Length and width(Height not consider)
Side view Height and width(Length not consider)
GE8152- ENGINEERING GRAPHICS UNIT-1 ORTHOGRAPHIC PROJECTION
REPRESENTATION OF ORTHOGRAPHIC VIEWS :
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GE8152- ENGINEERING GRAPHICS UNIT-1 ORTHOGRAPHIC PROJECTION
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GE8152- ENGINEERING GRAPHICS UNIT-1 ORTHOGRAPHIC PROJECTION
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GE8152- ENGINEERING GRAPHICS UNIT-1 ORTHOGRAPHIC PROJECTION
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GE8152- ENGINEERING GRAPHICS UNIT-1 ORTHOGRAPHIC PROJECTION
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GE8152- ENGINEERING GRAPHICS UNIT-1 ORTHOGRAPHIC PROJECTION
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GE8152- ENGINEERING GRAPHICS UNIT-1 ORTHOGRAPHIC PROJECTION
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GE8152- ENGINEERING GRAPHICS - UNIT-1 PLANE CURVES
Thank you

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