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Sectional Views KCEC 1101
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Section views are an important aspect of design documentation and are used to improve clarity and reveal interior features of the parts and structures. e
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Figure shows a regular multiview drawing and a sectioned multiview drawing of the same part I the front view; the hidden features can be seen after sectioning.
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Cutting plane: Traditional section views are based of an imaginary cutting plane that cut through the object to reveal interior features e
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Sectional views are used in every engineering discipline. In 3D views, sectional technical illustration are used to describe interior features of complicated assemblies (see figure below).
Sectional views
An important reason for using section views is to reduce the number of hidden lines in a drawing. However, when a minimum number of hidden lines are needed to represent features other than primary one shown by the section
Optional use of hidden lines
Visible surfaces and edges that represent a change of plane behind the cutting plane are drawn in section view.
Example of defining a cutting plane on a CAD model
Placement of cutting plane lines The cutting plane line is placed in the view where the cutting plane appears on edge.
Standard cutting plane line styles
ANSI standard section lines for various materials The angle at which section lines are drawn is usually 45 degrees to the horizontal, but this can be changed for adjacent parts shown in the same section (135 degrees) The sectional lines should be evenly equal space and should be thinner than visible lines
Section view types There are many different types of section views used on technical drawings: Full section Half section Broken-out section Revolved section Removed section Assembly section Auxiliary section
Full section
Haft Sections
Broken--out section out section
Revolved section
Removed section
Removed section
Offset section
Multiple offset section
Assembly section
Auxiliary section
Full auxiliary view
Partial auxiliary view
Special sectioning conventions Ribs, webs, and lugs are special types of features commonly found in mechanical components. These types of features require special treatment in section views.
Adding section lines to these features would give the false impression that the part is thicker than it really is.
Webs in section views Thin features such as webs, are left unsectioned when cut parallel to the feature by the cutting plane
Aligned sections Aligned sections are special types of orthographic drawings used to revolve or align special features of parts in order to clarify them or make them easier to represent in section
Aligning spokes in the section views is the conventional method of representation
Aligning lugs in the section views is the conventional method of representation
Conventional breaks
Conventional breaks are used for revolved section views or for shortening the view of an elongated part, such as a shovel handle or vehicle axle.
