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Sectional, Detailed, Broken Views: Basic Topics Advanced Topics Exercises

1) Sectional views show the interior of an object by imagining a cut through the object. Section lines indicate where the cut is made and arrows show the portion kept. 2) There are different types of sections - full sections cut all the way through, half sections expose one half while keeping the other half exterior visible. Offset sections cut at an angle to show features not in the same plane. 3) Exercises provide practice creating different section views like full, half and offset sections by visualizing cuts through objects based on given views and understanding section line conventions.

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Muhammad Ali Khan
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309 views49 pages

Sectional, Detailed, Broken Views: Basic Topics Advanced Topics Exercises

1) Sectional views show the interior of an object by imagining a cut through the object. Section lines indicate where the cut is made and arrows show the portion kept. 2) There are different types of sections - full sections cut all the way through, half sections expose one half while keeping the other half exterior visible. Offset sections cut at an angle to show features not in the same plane. 3) Exercises provide practice creating different section views like full, half and offset sections by visualizing cuts through objects based on given views and understanding section line conventions.

Uploaded by

Muhammad Ali Khan
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Sectional, Detailed,

Broken Views

Basic Topics
Advanced Topics
Exercises
Sectional Views
 A sectional view or section looks
inside an object.
→ Sections are used to clarify the interior
construction of a part that can not be clearly
described by hidden lines in exterior views.
→ By taking an imaginary cut through the
object and removing a portion, the inside
features may be seen more clearly.
Creating a Section View
The part is cut
using an imaginary
cutting plane.
Creating a Section View
 The unwanted portion is mentally discarded
exposing the interior construction.
Section Example
Sectional view label

Notice how the


cut material is
shown.

Notice how the


cutting plane is
indicated.
Lines Used in Section Views
Shows where Section
the part is being Lines
cut.

Arrows point to
the portion being
kept.
Lines Used in Section Views
 Section Lines: Section lines are used to
indicate where the cutting plane cuts the
material.
→ Section lines are thin lines.
→ Section line symbols are chosen according
to the material of the object
→ Section lines are generally drawn at a 45
angle.
Lines Used in Section Views
Common Section Line Symbols
Lines Used in Section Views
Common Section Line Symbols

More section line symbols shown in Fig. 4


Rules of Sectioning
 Rule 1:
A section
lined area is
always
completely
bounded by a
visible outline.
Rules of Sectioning
 Rule 2:
The section lines in
all areas should be
parallel.
→ Section lines
shown in opposite
directions indicate
a different part.
Rules of Sectioning
 Rule 3: All the visible edges behind the
cutting plane should be shown.
Rules of Sectioning
 Rule 4:
Hidden features should
be omitted in all areas of
a section view.
→ Exceptions include
threads and broken out
sections.
Exercise
Types of Sections
The type of section used depends on
the situation and what information
needs to be conveyed.

Types of sections
→Full Section
→Half Section
→Offset Section
→etc …
Full Section
 To create a full section, the cutting plane
passes fully through the object.
→ Used in many cases to avoid having to
dimension hidden lines.
Exercise 2

Full Section
Exercise 2
 Given the top and right side views, sketch
the front view as a full section.
→ The material used is steel.
Fill in the visible lines in the front full sectional view
Fill in the section lines in the front full sectional view
Section lines are
bounded by Visible features
visible lines behind the cutting
plane are shown.
Half Section
 A half
section
exposes the
interior of one
half of an
object while
retaining the
exterior of the
other half.
Half Section
 Half sections
are used
mainly for
symmetric
objects or
assembly
drawings.
Half Section
 A centerline
is used to
separate the
two halves.

 Hidden lines
should not be
shown on
either half.
Exercise 4

Half Section
Exercise 4
 Given the front and right side views,
sketch the top view as a full section and
create a half sectioned front view.
→ The material is brass.
Fill in the visible lines in the top full section view.
Fill in the section lines in the top full section view.
Fill in the visible lines in the right side half section view.
Fill in the section lines in the right side half section view.
Center line divides
the halves

No hidden lines
Offset Section
 An offset section is produced by bending
the cutting plane to show features that
don’t lie in the same plane.
Exercise 5

Offset Section
Exercise 5
 Given the front and top views, sketch the
three missing section views in their
appropriate places. The material is cast
iron.

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