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.

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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

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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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