Auto CAD 2I Revision By Cesar Mendoza
Drawing Instruments 1.Drawing Board 2.Tee Square 3.Set of Triangles and the 45 4.Pencils 5.Erasers 6.Compass 7.Protractor 8.Ruler 9.Circular Template 10.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
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
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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