1. Orthographic Drawing

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

3. Perspective Projection
Source, at a definite distance.

4. Orthographic Drawing
Source, at an infinite distance

5. Four Types of Projection

6. Six Standard Views
TOP
REAR
RIGHT
LEFT
FRONT
BOTTOM

7. Six Standard Views

8. Six Standard Views

9. Orthographic Drawing

10. Orthographic Drawing

11. Orthographic Drawing

12. Unfolding the Glass Box

13. Top & Right Side Views

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

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

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

17. bounded by straight lines, or curves.
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.

18. Edge View

19. True View

20. Foreshortened View

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

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

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

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

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

26. Shortened & Angled
Shortened & Angled
Oblique Edge

27. Angles

28. A corner or point, intersection of 3 planes
Vertices
A corner or point, intersection of 3 planes

29. Meaning of a Point
A vertex
Point view of an edge

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

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

32. Used to indicate symmetrical axes of circles
Center Lines
Used to indicate symmetrical axes of circles

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

34. Now : Guess the object....

35. So the Quiz Object....

36. Guess the object....

37. The object .... Is a rectangular prism

38. Guess the object....

39. The object ... Is a cylindrical prism

40. Third Angle Projection...

41. So The Object...

47. THAT’S IT FOR TODAY!
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