Podcast
Questions and Answers
What is the primary purpose of a section view in orthographic projection?
What is the primary purpose of a section view in orthographic projection?
What is the primary purpose of an Offset Section View?
What is the primary purpose of an Offset Section View?
What is the recommended angle for section lines when the outline of the object has 45o lines?
What is the recommended angle for section lines when the outline of the object has 45o lines?
What type of section view is used to show the internal details of an asymmetrical object?
What type of section view is used to show the internal details of an asymmetrical object?
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In an Aligned Section View, what is typically done with ribs and spokes?
In an Aligned Section View, what is typically done with ribs and spokes?
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What is the purpose of a Revolved Section View?
What is the purpose of a Revolved Section View?
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Which organization provides standards for section lines for various materials?
Which organization provides standards for section lines for various materials?
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In a section view, what should be omitted?
In a section view, what should be omitted?
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What is the purpose of a cutting plane in a section view?
What is the purpose of a cutting plane in a section view?
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What is the characteristic of section lines in a section view?
What is the characteristic of section lines in a section view?
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Study Notes
Sectional Views
- Orthographic views showing all hidden lines may not be clear enough to describe an object's internal details.
- Section views are used to overcome this shortcoming by imagining that part of the object has been cut away and shown in a cross-sectional view.
- The cut line is called a "cutting plane", and can be done in several ways.
Section Lining
- Lines should never be parallel or perpendicular to the object lines.
- If the outline of the object has 45° lines, 30° or 60° lines should be used.
- Assemblies with several parts should be lined with varying angle section lines.
Section Lining - Line Placement Breaks
- ANSI Standard Section Lines for Various Materials are set by the American National Standards Institute Mechanical and Aerospace Engineering Dept., SJSU.
Types of Section Views
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- Full section view: the cutting plane line passes fully through the part, and the section-lined areas are those portions that have been in actual contact with the cutting-plane.
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- Half section view: used for symmetrical objects, the cutting-plane line cuts halfway through the part and removes one quarter of the material.
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- Offset section view: used to show parts and features that do not line up with each other, the cutting-plane line does not travel in a straight line.
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- Aligned section view: usually used on symmetrical circular parts, the cutting-plane line is placed to show the most detail.
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- Broken-out section view: removes a small amount of material to show the interior details, used to enhance the orthographic view by giving the viewer a better look at key interior details.
Section View Guidelines
- All visible edges and contours behind the cutting plane should be shown.
- Hidden lines should be omitted in section views.
- A section view should always be bounded by a visible outline.
- There should be no lines in the hatched area.
- Section lines should be in the same direction.
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Description
This quiz introduces sectional views, a technique used to describe an object's internal details by imagining a part of it has been cut away and shown in a cross-sectional view. Learn about cutting planes, section lining, and line placement rules.
