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ENGINEERING DRAWING

ENGINEERING DRAWING. B.Tech I -YEAR -I SEM ( CE151AD ) Prepared By: Mr. ALAMODI USAMA BIN ABDUL AZIZ. Ass istant Professor Department of Civil Engineering. 1. Orthographic Drawing. Multiview Projection. Projection  a view of an object Is a photograph enough to describe an object?

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ENGINEERING DRAWING

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  1. ENGINEERING DRAWING B.Tech I -YEAR -I SEM (CE151AD) Prepared By: Mr. ALAMODI USAMA BIN ABDUL AZIZ AssistantProfessor Department of CivilEngineering 1

  2. Orthographic Drawing

  3. Multiview Projection • Projection  a view of an object • Is a photograph enough to describe an object? • A number of views, systematically arranged...

  4. Perspective Projection Source, at a definite distance.

  5. Orthographic Drawing Source, at an infinite distance

  6. Four Types of Projection

  7. Six Standard Views TOP REAR RIGHT LEFT FRONT BOTTOM

  8. Six Standard Views

  9. Six Standard Views

  10. Orthographic Drawing

  11. Orthographic Drawing

  12. Orthographic Drawing

  13. Unfolding the Glass Box The Glass Box

  14. Top & Right Side Views

  15. Third Angle Projection T Mitter Line D/2 D/2 D/2 D/2 F R A transparent picture plane is set up between object and the station point of an observer’s eye.

  16. Third Angle Projection Mitter line can only be used when the views are placed equidistantly. ?????

  17. First Angle Projection (Europe & Asia) Mitter Line R F The observer looks through the object to the planes of projection. D/2 D/2 D/2 D/2 T

  18. Views of Surfaces • To effectively create and interpret multiview projections, you have to consider the elements that make up most solids: • SURFACES • bounded by straight lines, or curves.

  19. Edge View

  20. True View

  21. Foreshortened View

  22. Normal Surface Parallel to the plane of projection (true shape&size)

  23. Perpendicular to a plane, but inclined or tipped to adjacent planes. Edge vien on perp. Plane, fs view on inclined planes Inclined Surface

  24. Tipped to all planes. FS on all planes. Oblique Surface

  25. True length in adjacent planes Point on perpendicular Plane. Normal Edge

  26. True length in parallel plane (angled) Shortened on adjacent planes (vertical / horizontal) Inclined Edge

  27. Shortened & Angled Shortened & Angled Oblique Edge

  28. Angles

  29. Vertices • A corner or point, intersection of 3 planes

  30. Meaning of a Point • A vertex • Point view of an edge

  31. Meaning of a Line • Visible or hidden: • An edge (intersection between 2 surfaces) • Edge view of a surface • Limiting element of a curved surface

  32. Hidden Lines Dashed hidden lines are used to represent features that would be hidden behind other surfaces.

  33. Center Lines Used to indicate symmetrical axes of circles

  34. Order of Drawing • Block out the views • Locate centerlines • Start details and arcs first • Draw dominant details • Check your views

  35. Now : Guess the object....

  36. So the Quiz Object....

  37. Guess the object....

  38. The object .... Is a rectangular prism

  39. Guess the object....

  40. The object ... Is a cylindrical prism

  41. Third Angle Projection...

  42. So The Object...

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