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Engineering graphics(orthographic projection)

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Engineering graphics(orthographic projection)

1. 1. PROJECTION VISHAL SRIVASTAVA B.Sc.(Hons) CS 115138 Tuesday, December 03, 2013 1
2. 2. Projections (1)  Projections transform points from n (here, n = 3) dimensional space into a space of dimension less than n (here, n = 2)  Points to be considered,  Location of object  Location of observer  Plane of projection  Projectors Tuesday, December 03, 2013 2
3. 3. Projections (2) Projections Parallel/ Cylindrical Oblique Perspective/ Conical Orthographic One-Point Cabinet Cavalier Three-Point Multi-view First-angle Fourth-angle Other Third-angle Second-angle Axonometric Isometric (30°) Tuesday, December 03, 2013 Two-Point Di-metric Trimetric 3
4. 4. Perspective Projections Tuesday, December 03, 2013 4
5. 5. Parallel Projections Tuesday, December 03, 2013 5
6. 6. Parallel Projections  Projectors are parallel to each other but not perpendicular to projection plane  Effective in pictorially representing objects Tuesday, December 03, 2013 6
7. 7. Axonometric The object is tilted and all three coordinate axes are visible in any one view (PP projection plane) Tuesday, December 03, 2013 7
8. 8. Orthographic (Orthogonal) The object is at rest and two coordinate axes are visible in any one view (PP projection plane) Tuesday, December 03, 2013 8
9. 9. Multiview Projections  Front surfaces of object is parallel to plane of projection  Projectors or line of sights are perpendicular to projection plane  Projectors are parallel to each other and originate from any point on object Tuesday, December 03, 2013 9
10. 10. Multiview Projections Tuesday, December 03, 2013 10
11. 11. The six views Tuesday, December 03, 2013 11
12. 12. Angles  First angle projection – European System  Third angle projection – American System Tuesday, December 03, 2013 12
13. 13. First Angle Projection Tuesday, December 03, 2013 13
14. 14. First Angle Projection 1 How to draw plan and elevation? Tuesday, December 03, 2013 14
15. 15. First Angle Projection 3 Points to remember: • The ‘front view’ (or elevation) is the view with maximum information. •The ‘plan’ is below the ‘elevation’ (in projection). •The ‘end view’ is placed on the right if viewed from left side of object and on the left if viewed from right side. •‘End view’ and plan face inwards from ‘elevation’. Tuesday, December 03, 2013 15