Date post: | 22-Dec-2015 |
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Chapter 5Technical Sketching & Shape
description
Instructor: M.Yaqub
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.
The most important rule in free hand sketching is
keep the sketch in proportion
Perspective view: one vanishing point
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.
Front view: From where the object is mostly used.
Necessary Views
Meanings of Lines: Visible line could be 1) Intersection of two surfaces2) Edge view of a surface3) Contour view of a curved surface
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