1. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
Lecture #5
SECTION VIEW
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
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2. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
This week
You will learn creating sectional views.
The steps to follow are:
Cutting plane
Kind of section views (full, half, etc.)
Section line symbols
Conventional practice
Assembly sections
Creating section views in AutoCAD
Assignment # 4
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
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3. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
Principles
CREATING SECTIONS
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
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4. Sectional views are usually produced
To clarify details of the object
To illustrate internal features clearly
To reduce the number of hidden detail lines
To facilitate the dimensioning of internal features
To show the shape of the cross-section
To show clearly the relative positions of forming an assembly
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
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5. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
Sectional views
Newly visible edges cut by cutting plane are crosshatched with section lining.
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

6. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
Cutting plane
Cutting plane is a plane that imaginarily cuts
the object to reveal the internal features.
Cutting
plane
Cutting plane line
Section lines
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
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7. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
Cutting plane line
Cutting plane line is an edge view of the cutting plane.
Indicate the path
of cutting plane.
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

8. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
Cutting plane line
TS & ISO
standard
Center line
Viewing
direction
This course
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

9. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
Cutting plane line
Thick line
ANSI
standard
Viewing
direction
Thick line
Viewing
direction
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

10. Labeling cutting plane
Note that each section (A-A and B-B) is completely independent.
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
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11. Visualizing cutting plane
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12. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
Principles
KIND OF SECTIONS
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
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13. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
Kind of sections
1. Full section
2. Offset section
3. Half section
4. Broken-out section
5. Revolved section (aligned section)
6. Removed section (detailed section)
7. Aligned section
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
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14. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
Kind of sections
Broken-out
Offset section
Aligned section
Revolved section
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
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15. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
Offset section view
The view is made by passing the bended cutting plane completely through the part.
Do not show the edge views
of the cutting plane.
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

16. Broken-out section view
The view is made by passing the cutting plane normal to the viewing direction and removing the portion of an object in front of it.
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

17. Broken-out section view
A break line is used to separate the sectioned portion from the unsectioned portion of the view.
Break line is a thin continuous line (0.25) and is drawn freehand.
There is no cutting plane line.
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

18. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
Principles
SECTION LINING
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19. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
Section line symbols
Uniformly spaced by an interval of about 2.5 mm
Not too close together
Uniformly thin, not varying in thickness
Distinctly thinner than visible lines
Neither running beyond or not stopping short of visible outline
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

20. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
Section line symbols
The section lines are different for each of material’s type.
For practical purpose, the cast iron symbol is used most often for any materials.
Cast iron,
Malleable iron
Steel
Concrete
Sand
Wood
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
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21. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
Section line symbols
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

22. Rules of lines in section view
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
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23. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
Principles
CONVENTIONAL PRACTICE
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24. Conventional Practice
There are some exceptions to the general rules of sectioning:
Webs, ribs, lugs, spokes,
Shafts, rods, spindles,
Bolts, nuts and thin washers.
Rivets, dowels, pins and cotters.
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
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25. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
Terminology
Rib and Web are thin, flat feature of an object that acts as a structural support.
Rib
Rib
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
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26. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
Terminology
A web or rib is a strengthining or supporting part of a component.
Web
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
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27. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
Terminology
Spoke is the rod radiating from the hub to the rim of a wheel.
Hub
Hub
Spoke
Rim
Spoke
Rim
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
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28. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
Terminology
Lug is an ear which is built as portion of an object for attachment.
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
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29. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
Rib in sections
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
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30. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
Lug in sections
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
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31. Treatment of web & spoke
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
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32. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
Assembly section
Views show how the parts fit together
Individual components are identified by the use of numbers
Adjacent components are hatched with a different properties (angle or scale)
Standard components such as bolts, nuts are not hatched
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
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33. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
Assembly section
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

34. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
Principles
CREATING SECTION VIEW IN AUTOCAD
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
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35. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
HATCH command
From icon menu
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36. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
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37. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
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38. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
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39. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
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40. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
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41. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

42. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
GRADIENT command
From icon menu
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
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43. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

44. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
The following week
MIDTERM EXAM #1
HOMEWORK #1
SUBMISSION
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

45. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
Assignment #4
Page
222
Figure
7.57
You will sketch and complete views
Submit the assignment on time
Upload file into NINOVA
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU