Unit 1 orthographic projection engineering graphics

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1. Dr.R. GANESAMOORTHY.B.E.,M.E.,Ph.d.Dr.R. GANESAMOORTHY.B.E.,M.E.,Ph.d.
Professor –Mechanical EngineeringProfessor –Mechanical Engineering
Saveetha Engineering CollegeSaveetha Engineering College
Tandalam Tandalam
Chennai.Chennai.
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2. Orthographic projections
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.
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3. Orthographic Projection
Multi-view drawings provide the most accurate
description of 3D objects and structures for engineering,
manufacturing, and construction requirements
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
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4. Conventional Projections
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5. `
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ORTHOGRAPHIC PROJECTIONS

6. Orthographic projections
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7. 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)
Arrangement of views
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8. Representation of orthographic views
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9. Representation of orthographic views
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10. Representation of orthographic views
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11. Representation of orthographic views
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12. Representation of orthographic views
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13. Representation of orthographic views
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14. Representation of orthographic views
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15. Representation of orthographic views
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16. Representation of orthographic views
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17. Representation of orthographic views
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18. Representation of orthographic views
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19. Representation of orthographic views
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20. Representation of orthographic views
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21. Representation of orthographic views
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22. Representation of orthographic views
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23. Representation of orthographic views
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24. Representation of orthographic views
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25. Representation of orthographic views
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26. Representation of orthographic views
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27. Representation of orthographic views
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28. Representation of orthographic views
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