SECTIONS

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SECTIONS

• A section view clarifies the shape and location
  of the internal features. In a section view the
  object is sliced with an imaginary cutting plane.
  The portion closest to the viewer is removed so
  that the internal features of the object are
  visible.

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Section Line Symbols
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Full Section

• In a full section, the cutting plane goes all the
  way across the object in a straight line. The
  section is typically drawn in an adjacent view
  and replaces the orthographic view. Here, the
  front view is now drawn as a full section.

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Full Section

• The internal features normally shown with hidden
  lines are now represented with visible lines.
  The portion of the object where the cutting plane
  slices through material is crosshatched with
  light section lines.

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Half Section

• Half sections are useful for showing both the
  internal features and external features of an
  object. In the sectional view, half of the object
  appears as a section and the other half appears
  as a normal view. Typically, hidden lines are
  not shown on the half section.

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Offset Section

• In order to pass the cutting plane through the
  holes and slots the cutting plane line must
  sometimes bend at 90 angles to form an offset
  section. The bend in the cutting plane line does
  not create a visible line in the section view.

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Broken-Out Section

• To illustrate interior features, a portion of the
  object is imaginatively broken away and the
  interior features are drawn in section. A jagged
  line is used to indicate the break and separate
  the section from the normal exterior view.
  Hidden lines are included in the normal view.

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Revolved Section

• A revolved section shows a cutting plane
  perpendicular through the feature. The material
  cut with the cutting plane is then rotated 90
  and the measurements are projected to the
  adjacent view. This revolved section is drawn
  directly on the adjacent view.

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Removed Section

• If there is not room or if the drawing becomes
  too cluttered, the section can be drawn adjacent
  to the view as a removed section. Similar to the
  revolved section, the main difference is the
  location of the sectional drawing.