1. Auto CAD 2I Revision By Cesar Mendoza

2. Drawing Instruments 1.Drawing Board 2.Tee Square 3.Set of Triangles 30 60 and the 45 4.Pencils 5.Erasers 6.Compass 7.Protractor 8.Ruler 9.Circular Template 10.Eraser

3. Drawing paper

4. Layout drawing paper

5. Line type

6. Module 2: Geometric Construction Bisecting a Straight Line

7. Bisecting an Angle

8. Constructing a regular hexagon given one side length.

10. Tangency

11. Exercises

13. Freehand Pictorial Sketching

15. Isometric Projection

16. Exercise

17. Isometric Drawing

19. Isometric drawing of circles and cylinders

20. Exercises

21. Module 5: Orthographic Projection

22. Principle views

26. Fig. 5.8:A second example of the third angle projection

28. 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).

30. 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

31. Half Section

32. 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.

33. 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

34. Thank you for listening