sectional drawing views
Post on 15-Nov-2014
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Sectional Drawing Views Sections, or sectional views, are used
to describe the interior portions of an object that are otherwise difficult to visualize
Section views are used to get rid of the confusing hidden lines. They are a way to, in our imagination, cut through an object and create an orthographic view inside the object. It is as if the object were cut in two. Normally the sectional view takes the place of a regular view.
Section Lines Usually drawn equally spaced and at a
45°angle ( alternative angles: 30°,60°)
Larger parts have larger spacing May not be drawn parallel or
perpendicular to any line of the object Never draw horizontal or vertical Draw at opposite angles on adjacent
parts Use general section lines or coded
section lines
The material that is supposedly cut is "Hatched" with patterns. The patterns often depict the actual material of the object. The most commonly used is the cast iron or general use.
Cutting Plane Line
A thick line that represents the edge view of a cutting plane through a part.
The cutting plane line is capped on the ends with arrowheads that show direction of sight of the sectional view.
The cutting plane line and related sections should be labeled with letters beginning with “A.”
Slicing a Part
Click here for the Slicing the Part Animation
Click here to the Cutting Plane Animation
Types of Sections
Full Sections Half Sections Offset Sections Aligned Sections Revolved Sections Removed Sections
The cutting plane extends straight through the object. Notice that the 45 ° sections are shown where the cutting plane cuts through the actual material of the object.
Full Sections
Click here for the Full Section Animation
Half Sections Half Section Views are used primarily on
symmetrically shaped objects. They cut through half of the object.
Click Here for the Half Section Animation
Offset Sections Offset Section Views are like full section views
except that the Cutting Plane bends to follow certain features inside the object.
Click Here for the Offset Section Animation
Revolved Sections Revolved Views are a shortcut way to show a section view that
shows the internal shape of an object without creating a completely separate section view. The cutting plane passes through the object at the desired location and is revolved, in place, to show the section view.
Click Here for the Revolved Animation
Removed Sections Type of section that is moved from its normal position
to a more convenient position on the drawing.
Aligned Sections Used when it is important to include details of a part by bending
the cutting plane. The cutting plane and the feature are imagined to be aligned or revolved before the section view is created.
Click Here for the Aligned Animation
Conventional Breaks Conventional Breaks are a way of depicting a very long
object without showing the entire length. It is often used for objects like solid shaft or a length of tubing.
Broken Out Sections Used when only a small part of a view needs to be
sectioned to show detail of construction.
Ribs and Webs
Rib and Web are thin, flat feature of an
object that acts as a structural support.
Spoke
Spoke is the rod radiating from the hub to the rim of a wheel. Spokes are not sectioned.
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Rim
Spoke
Spoke
Rim
HubHub
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