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Half Sections. If the cutting plane is passed halfway through an object, and one-quarter of the object is removed, the resulting section is a half section. A half section has the advantage of showing both inside and outside configurations. It is frequently used for symmetrical objects.
- Section Views – Engineering Graphics and Design
A half section view means that you are only removing a...
- Section Views – Engineering Graphics and Design
A half section view means that you are only removing a quarter of an object. This type of view is ordinarily used when the object is symmetrical or if you only need to show a portion of a complex assembly.
A Half Sectional View slices half of the object to reveal interior on one side and external features on the other. It's ideal for symmetrical objects. An Offset Sectional View displays unaligned internal features by using a staggered cutting plane, showing a 'zigzag' cut effect.
- Full Sections. A Full section view is where the entire part or assembly is cut on a single plane. The generated section view that is created may form part of the same view as the reference view, permitted the correct projection method (first or third angled projection) is used.
- Half Section. The half section view may be used where a part or assembly is symmetrical about the centerline of the part or assembly. This will save space on the drawing with over population of reference and section views.
- Partial Section. A Partial section is used when only a certain portion of a part or assembly is cut in order to show important detail or geometry. The whole part or assembly is not sectioned as that may minimize the other information show.
- Revolved Section. A revolved section is a section that is made at a certain point in a part and revolved 90° to show the cross section of the part. The part can be broken to show the revolved section or the revolved section can be superimposed on the part itself.
- Section Lining. The lines in the figure above, which look like saw marks, are called section lining. They are found on most sectional views, and indicate the surface which has been exposed by the cutting plane.
- Full Sections. When a cutting plane line passes entirely through an object, the resulting section is called a full section Fig. 7 illustrates a full section.
- Half Sections. If the cutting plane is passed halfway through an object, and one-quarter of the object is removed, the resulting section is a half section.
- Broken Out Sections. In many cases only a small part of a view needs to be sectioned in order to show some internal detail. In the figure below, the broken out section is removed by a freehand break line.
The sectioned view provides a much clearer “picture” of the part. This view is arrived at by cutting the part, as shown in the front view, along a sectioning line (actually a plane) and by removing the right half of the part, as shown in Figure 3.3.2 on the next page.
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Architectural drawings use section views to reveal the interior details of walls, ceilings, floors, and other elements of the building structure. Sectional drawings are multi-view technical drawings that contain special views of a part or parts, which reveal interior features.
