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Auto CAD 2I Revision. By Cesar Mendoza. Drawing Instruments. Drawing Board Tee Square Set of Triangles 30 60 and the 45 Pencils Erasers Compass Protractor Ruler Circular Template Eraser. Drawing paper. Layout drawing paper. Line type. Module 2: Geometric Construction. - PowerPoint PPT Presentation
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Auto CAD 2IRevisionBy Cesar Mendoza
Drawing Instruments
1. Drawing Board2. Tee Square3. Set of Triangles 30 60 and the 454. Pencils5. Erasers6. Compass7. Protractor8. Ruler9. Circular Template10. Eraser
Drawing paper
Layout drawing paper
Line type
Module 2: Geometric Construction
• Bisecting a Straight Line
Bisecting an Angle
Constructing a regular hexagon given one side length.
Tangency
Exercises
Freehand Pictorial Sketching
FREEHAND DRAWING : MAKE A FREEHAND PENCIL DRAWING OF EACH OBJECT ON THE ISOMETRIC GRID.
NAME: CLASS: DATE:
1 2
3 4
1 2
4 3
T
Isometric Projection
Exercise
Isometric Drawing
Isometric drawing of circles and cylinders
Exercises
Module 5: Orthographic Projection
Principle views
Fig. 5.8:A second example of the third angle projection
H
8
2
43
15
7
6
910
1
2
4
3
8
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FIRST ANGLE PROJECTION
The drawing show pictorial and orthographic views of the same block. Complete the table on the right by matching the letters on the pictorial view with the numbers on the orthographic views.
NAME: ID.NO DATE:
Module 6: Sectional Views • 1.Introduction to Sectional Views • • A sectional view is that view seen beyond an imaginary plane
passing through an object at right angles to the direction of sight. Sectional views are used to show the interior construction or details of hidden features that can not be shown clearly by outside views.
• The cutting plane on which a section has been taken is indicated by a heavy dash line. Arrow heads at the ends of the cutting plane lines are used to indicate the direction in which the sections are viewed. See Fig 6.1 (a, b).
2.Types of sectional views
• Full Section• A full section view is made by passing an imaginary cutting
plane fully through an object. The figure shows an imaginary cutting plane passing fully through an
Half Section
Rib and Web Sections• The thin webs are not normally sectioned even though they
lie in the section plane, according to ISO recommendations. A good way to accept these exceptions to the general rule are to imagine how complicated the drawing would look if they are sectioned.
3.Hatching• Hatching lines are thin lines and should preferably be inclining
at 45 degrees. They should be evenly spaced. If there are two or more adjacent sectioned parts, the hatching lines should either be of different spacing or different direction. (See Fig 6.6.) However, hatching pattern should be the same for separate areas of a single object
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