1. Module 6: Sectional Views
AutoCAD 2D_I
Module 6: Sectional Views

2. Module Objectives
Differentiate the different types of sectional views.
Create sectional views drawing from a given isometric or oblique drawings.
Define hatching and explains it’s function

3. Introduction to Sectional Views

4. 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.

5. Introduction to Sectional 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 the following figures

7. Types of sectional views

8. Types of sectional views
Half Section
Full Section
Non-sectioned parts
Rib and Web Sections
Next

9. Full Section
A full section view is made by passing an imaginary cutting plane fully through an object.
Next

10. Full Section
In a multiview drawing, a full section view is placed in the same position that an unsectioned view would normally occupy. that is, a front section view would replace the traditional front view
Next

11. Full Section
The figure below shows an imaginary cutting plane passing fully through an object and half of it being removed.
Next

12. Back

13. Half Section
Half sections are created by passing an imaginary cutting plane halfway through an object and one quarter of it is removed.
Next

14. Half Section
Hidden lines are omitted on both halves of the section view. External features of the part are drawn on the unsectioned half of the view. A center line, not an object line, is used to separate the sectioned half from the unsectioned half of the view
Next

15. Half Section
Half section views are most often used on parts that are symmetrical, such as cylinders. See the following figures
Next

16. Back

17. Rib and Web Sections
The thin webs are not normally sectioned even though they lie in the section plane, according to ISO recommendations.
Next

18. Rib and Web Sections
A good way to accept these exceptions to the general rule are to imagine how complicated the drawing would look if they are sectioned.
Next

19. Rib and Web Sections
See the following figure. The ribs are sectioned when they lie across the section plane.
Next

20. Back

21. Non – Sectioned Parts
For extremely thin parts of less than 4 mm thickness, the parts should be Shown in solid without section lines. It is common practice to show standard parts 'in the round' or un-sectioned views as shown in the following figures
Next

22. Next

23. Back

24. Hatching

25. Hatching
Hatching lines are thin lines and should preferably be inclining at 45 degrees. They should be evenly spaced.

26. Hatching
If there are two or more adjacent sectioned parts, the hatching lines should either be of different spacing or different direction. See the following figures. However, hatching pattern should be the same for separate areas of a single object.

28. Examples on Sectioning

29. Examples on Sectioning
Next

30. Three views without sections.
Back

31. Full section in front (elevation).
Back

32. Full section in the side view.
Back

33. Half section in Front elevation and half section in side view.
Back

34. Worksheets and class Activities

35. Worksheets and Homework
Next

36. Worksheet 1
Match the correct section view with the corresponding drawing. Write the correct sectional view letter beside the drawing number in the space provided
Next

38. Worksheet 2
Match the correct section view with the corresponding drawing. Write the correct sectional view letter beside the drawing number in the space provided.
Next

40. Worksheet 3
Use an A3 size drawing sheet to redraw the following views: 1. The top view. 2. The complete sectional front view at A-A. 3. The side view.
Next

41. Back

42. Homework
Using the THIRD angle projection, draw the following ORTHOGRAPHIC views of component shown below. 1. A complete sectional side view from arrow S. 2. A front view from arrow F. 3. A plan view from arrow P
Next

43. Back

44. The End