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Full Section
The cutting plane line extends straight though the object, generally at the centerline of symmetry.
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Half Section
- The cutting plane passes half way through the object, removing one fourth of the object.
- • Half sections are most applicable to symmetrical objects to show both the interior and exterior in a single view.
- • A centerline is used between the sectioned and the unsectioned half.
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Offset Section
To include features that do not appear in a straight line, the cutting plane may be offset to pass through the features. Offsets or bends created by the cutting plane are not shown on the section view.
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Aligned Section
The cutting plane is offset to pass through features that are then rotated into a plane perpendicular to the line of sight of the section view.
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Broken-Out Section
Where only a portion of the object needs to be shown in the section. The section is limited by a short (freehand) break line. No cutting plane line is required.
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Revolved Section
A cutting plane line is passed through the object and revolved 90° in place towards the plane of the drawing. Used to show the cross section of a spoke, bar, rib, etc.
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Removed Section
- A section that is not a direct projection from the view with the cutting plane. The section view is generally moved from its normal projection position, but must remain in its true orthographic orientation.
- • Removed sections are often drawn at a scale different from the view it was taken from.
- • Center lines may extend from the imaginary cutting plane to the removed section provided it is symmetrical.
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Ribs/Webs/Keyways
Webs, ribs, gear teeth and other like features are not sectioned to avoid giving a false impression of the parts thickness.
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What is the function of a section view?
To show complicated interiors of parts that are difficult to interpret through the use of hidden lines.
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Explain the function of the cutting plane line and it’s application for the different section view types.
- To indicate the location of the imaginary cut made to reveal interior details.
- Identify the line of sight for the individual view in the part through the use of arrows.
- If 2 or more sections are present; identify the particular sections through the use of letter identifiers.
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Explain the application of section lines and their forms.
- Cast iron, .125” uniformly spaced thin lines, is the general-purpose section line.
- Section lines should all be at the same angle for a single part. Section lines at different angles on the same drawing indicate more than one part.
- Section lines should not be drawn vertical, horizontal or parallel to an adjacent object line of the drawing.
- Section lines can identify the general class of material such as steel, brass or rubber.
- Thin items such as gaskets or sheet metal are shown unsectioned.
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