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- Sometimes it is not necessary to cut the whole part to show the section view. Objects that are symmetrical about a centre line you may draw having one half as a multiview and the other half in section view.
www.mcgill.ca/engineeringdesign/step-step-design-process/basics-graphics-communication/sectioning-techniqueSectioning Technique | Engineering Design - McGill University
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Objects that are symmetrical about a centre line you may draw having one half as a multiview and the other half in section view. In such situation. Cutting plane line is shown across the whole part; Section plane through center line of a symmetric part can be omitted; Hidden lines in half sections are usually omitted.
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.
- 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.
- Cutting Plane. A surface cut by the saw in the drawing above is a cutting plane. Actually, it is an imaginary cutting plane taken through the object, since the object is imagined as being cut through at a desired location.
- Cutting Plane Line. A cutting plane is represented on a drawing by a cutting plane line. This is a heavy long-short-short-long kind of line terminated with arrows.
- 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 section Half sections are useful when drawing a sym-metrical object. Both the inside and the out-side can be shown in one view. Use a centerline where the exterior and half-sectional views meet because the object is not actually cut. In the top view, show the complete object because no part is actually removed. If the direction of viewing is
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.
HALF SECTIONS •If a cutting plane passes halfway through an object, the result is a half section. •Expose the interior and retain the exterior. •It is often used for symmetrical objects, not for detail drawings.
