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- Section drawing Section drawing A section drawing (also called a section, or sectional drawing) depicts a structure as though it had been sliced in half or cut along an imaginary plane, usually at a vertical orientation, allowing the viewer to see the interior of a building and, if applicable, its different levels or floors.
www.moma.org/collection/terms/section-drawing
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What is a sectional drawing?
What is a section drawing?
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What is a sectional view?
What is a section view in a mechanical drawing?
- General Principles
- Section Lines and Symbols
- Cutting Planes
- Main Principles of Placement of Sectional Views
A sectional view represents the part of an object remaining after a portion is assumed to have been cut and removed.The exposed cut surface is then indicated by section lines.Hidden features behind the cutting plane are omitted, unless required for dimensioning or for definition of the part.Section lines, or hatching, that represent the cut surface usually consist of thin parallel lines, as shown below, drawn at an angle of approximately 45° to the principal edges or axes of the part. For most purposes, the general use symbol of cast iron is used. When it is desired to indicate differences in materials, for example on assembly drawing...
Cutting plane lines which show where the cutting plane passes through the object, represent the edge viewof the cutting plane and are drawn in the view(s) adjacent to the section view. Here the cutting plane is drawn as an edge in the top view, which is adjacent to the sectioned front view. This is a frontal cutting plane. Lines of sight should alw...
Whenever practicable, and except for revolved sections, you should project sectional views perpendicular to the cutting plane and place it in the normal position for third angle projection.You should never show the views in first angle projected position on a third angle projection drawing.When the preferred placement is not practical you may remove the sectional view to some other convenient position on the drawing, but it must be clearly identified, usually by two capital letters,...Normally, you should not change orientation of the view, but if this becomes necessary, you must state the number of degrees through which it is revolved.Section views are used extensively to show features of an object or an assembly that are not easily visible from the exterior. This method can be used with both simple and complex objects and involves the use of a cutting plane that dictates what portion of the object you want to remove to reveal a more complex interior.
Sectional drawings are multiview technical drawings that contain special views of a part or parts, a view that reveal interior features. In the figure a regular multiview drawing and a sectioned multiview drawing of the same part in the front view, the hidden features can be seen after sectioning.
In these cases, a special view called a section, or sectional view, should be drawn. A sectional view shows an object as if part of it were cut away to expose its insides (see Figure 8-1B). To best understand sectional views, imag-ine that a wide-blade knife has cut through an object.
When sketching an object or part that requires a sectional view, they are drawn by eye at an angle of approximately 45 degrees, and are spaced about 1/8” apart. Since they are used to set off a section, they must be drawn with care.
A section drawing is one that shows a vertical cut transecting, typically along a primary axis, an object or building. The section reveals simultaneously its interior and exterior profiles, the interior space and the material, membrane or wall that separates interior from exterior, providing a view of the object that is not usually seen.
