1. Chapter 5 Technical Sketching & Shape description
Instructor: M.Yaqub

3. Technical Sketching
Sketching Material: only paper, pencil and eraser is required for free hand sketching.
Types of sketches: Can be Isometric, oblique, multi-view or perspective.
Scale: Generally drawn not to scale but in correct proportions.

18. The most important rule in free hand sketching is keep the sketch in proportion

31. Perspective view: one vanishing point

33. Views of Objects A pictorial view can not describe the object fully.
In industry, a complete information is required about shape and size.
To provide all information, a number of views are used called multi-view projection.
The three principal dimensions are depth, height and width. Any two can be shown in one view.

37. Front view: From where the object is mostly used.

39. Necessary Views

55. Meanings of Lines: Visible line could be 1) Intersection of two surfaces 2) Edge view of a surface 3) Contour view of a curved surface

56. Precedence of Lines
A visible line always takes precedence over a hidden or center line (A and B in Fig. 5-49).
A hidden line takes precedence over a center line (C in Fig. 5-49).
Ends of the center line are shown in A and C