8- sectional views
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Sectional ViewsSectional ViewsKCEC 1101
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Section views are an important aspect of design and documentation and are used to improve clarity and reveal interior features of the parts and structures.
Figure shows a regular multiview drawing and a
sectioned multiviewdrawing 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 on used of an imaginary cutting plane that cut through the object to reveal interior features
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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
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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
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Visible surfaces and edges that represent a change of plane behind the cutting plane are drawn in section view.
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Example of defining a cutting Example of defining a cutting plane on a CAD modelplane on a CAD model
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Placement Placement of cutting of cutting
plane linesplane linesThe cutting plane line is placed in the view where the cutting plane appears on edge.
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Standard cutting plane line stylesStandard cutting plane line styles
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ANSI standard ANSI standard section lines for section lines for various materialsvarious 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
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Section view typesSection view typesThere are many different types of section views used on technical drawings:
Full sectionHalf sectionBroken-out sectionRevolved sectionRemoved sectionAssembly sectionAuxiliary section
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Full sectionFull section
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Haft SectionsHaft Sections
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BrokenBroken--out sectionout section
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Revolved sectionRevolved section
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Removed sectionRemoved section
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Removed sectionRemoved section
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Offset sectionOffset section
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Multiple Multiple offset sectionoffset section
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Assembly sectionAssembly section
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Auxiliary sectionAuxiliary section
Full auxiliary view Partial auxiliary view
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Special sectioning conventionsSpecial sectioning conventionsRibs, 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.
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Webs in section viewsWebs in section viewsThin features such as webs, are left unsectioned when cut parallel to the feature by the cutting plane
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Aligned sectionsAligned sectionsAligned 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
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Aligning spokes in the section views is the conventional method of representation
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Aligning lugs in the section views is the conventional method of representation
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Conventional Conventional breaksbreaks
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.
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A section view created on 3A section view created on 3--D D CAD modelCAD model
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