Unit 7 Sectional View
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Transcript of Unit 7 Sectional View
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UNIT 7 :
SECTIONAL VIEW
Ken Youssefi Mechanical and Aerospace Engineering Dept., SJSU 1
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Ken Youssefi Mechanical and Aerospace Engineering Dept., SJSU 2
Section Views
Orthographic views showing all hidden lines may not be
clear enough to describe an objects internal details.
This shortcoming can be overcome by imagining that part
of the object has been cut away and shown in a cross-sectional view. This view is called a section view.
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Ken Youssefi Mechanical and Aerospace Engineering Dept., SJSU 3
Type of Section Views
Full section view
Offset section view (multiple offset views)
Half section view Broken section view
Aligned and Revolved section views
Removed view
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Ken Youssefi Mechanical and Aerospace Engineering Dept., SJSU 4
Section ViewFull Section
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Ken Youssefi Mechanical and Aerospace Engineering Dept., SJSU 5
Section ViewOffset Section
Offset cutting plane
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Ken Youssefi Mechanical and Aerospace Engineering Dept., SJSU 6
Section ViewMultiple Offset Sections
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Ken Youssefi Mechanical and Aerospace Engineering Dept., SJSU 7
Section ViewHalf Section
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Ken Youssefi Mechanical and Aerospace Engineering Dept., SJSU 8
Section ViewBroken Section
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Ken Youssefi Mechanical and Aerospace Engineering Dept., SJSU 9
Section ViewAligned & Revolved Section
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Ken Youssefi Mechanical and Aerospace Engineering Dept., SJSU 10
Section View
Removed sections placed
outside of the view
Hatch lines
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Ken Youssefi Mechanical and Aerospace Engineering Dept., SJSU 11
Section Viewreview
All visible edges and contours behind the cutting plane should be shown.
Hidden lines should be omitted in section views.
A section view should always be bounded by a visible outline.
There should be no lines in the hatched area.
Section lines should be in the same direction.
Use standard section lines (hatch) to show materials.
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Ken Youssefi Mechanical and Aerospace Engineering Dept., SJSU 12
Breaks and Sectioning
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Ken Youssefi Mechanical and Aerospace Engineering Dept., SJSU 13
ANSI Standard Section Lines
for Various Materials
ANSI-31
ANSI-133
ANSI-134
American
National
Standards
Institute
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Section Lining
Ken Youssefi Mechanical and Aerospace Engineering Dept., SJSU 14
MaterialsCommon
materials
The symbol for cast iron
can be used for most
section views.
Refer to any common
drafting text for additional
symbols.
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Ken Youssefi Mechanical and Aerospace Engineering Dept., SJSU 15
Section Lining
45 degree angle lines should be used.
1/8 between lines.
All lines should be uniformly spaced
Thin sections may be blackened in
completely
Spacing lines by eye increases speed
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Ken Youssefi Mechanical and Aerospace Engineering Dept., SJSU 16
Section LiningLine Placement
Lines should never be parallel or
perpendicular to the object lines.
If the outline of the object has 45 degree
lines, 30 or 60 degree lines should be used.
Assemblies with several parts should be
lined with varying angle section lines.