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Section Views. Lecture 10. Topics For Today. Sections Views Why section views are needed Types of section views References TG Chapter 5 QUIZ – Wednesday/Thursday – Sections Lab 3 – Thursday/Wednesday – Springs & Levers Read the lab notes and procedures before coming to lab.

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section views

Section Views

Lecture 10

Autumn Quarter

topics for today
Topics For Today
  • Sections Views
    • Why section views are needed
    • Types of section views
    • References
      • TG Chapter 5
  • QUIZ – Wednesday/Thursday – Sections
  • Lab 3 – Thursday/Wednesday – Springs & Levers
    • Read the lab notes and procedures before coming to lab

Autumn Quarter

section views1
Section Views
  • Goals
    • Recognize various kinds of section views, make full and half section views.
    • Improve visualization of interior features.

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section views2
Section views are used when important hidden details are in the interior of an object.

These details appear as hidden lines in one of the orthographic principal views; therefore, their shapes are not very well described by pure orthographic projection.

Section Views

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types of section views
Types Of Section Views
  • Full sections
  • Half sections
  • Offset sections
  • Revolved sections
  • Removed sections
  • Broken-out sections

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cutting plane
Cutting Plane
  • Section views show how an object would look if a cutting plane (or saw) cut through the object and the material in front of the cutting plane was discarded

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cutting plane line
Cutting Plane Line
  • Precedence of Lines

Center Line

Hidden Line

Object Line

Cutting Plane

Line

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section lines
Section Lines
  • Section lines (crosshatching) are used to show where the cutting plane passed through solid material

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full section view

Hidden Lines are Visible

Full Section View
  • In a full section view, the cutting plane cuts across the entire object
  • Note that hidden lines become visible in a section view

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full section view1
Full Section View
  • Shows cutting plane in the top view
  • Makes a full section on the front view

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full section view2

Visible lines omitted

Incorrect

Correct

Full Section View
  • Note how the cutting plane is drawn and how the crosshatching lines mark the surfaces of material cut by the cutting plane.
  • No hidden lines on the section view, if possible.
  • Note: Interior lines behind cutting plane became visible.

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multiple sectioned views

SECTION A-A

B

A

A

SECTION B-B

B

Multiple Sectioned Views

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half section view
Half Section View

The cutting planes do not cut all the way through to the object. They cut only half way. They intersect at the centerline.

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half section view1
Half Section View
  • Half Section used mainly for symmetric objects

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revolved sections
Revolved Sections
  • Revolved sections examples show the shape of an object’s cross-section superimposed on a longitudinal view

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removed sections

A

Section B-B

A

Section A-A

B

B

Section C-C

C

C

Removed Sections

Removed sections are like revolved sections but moved aside. Note how they are named.

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broken out sections
Broken Out Sections

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offset sections
Offset Sections

Offset sections are used to show interior features that do not lie along a straight line

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offset sections1
Offset Sections

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conventional revolutions
Conventional Revolutions
  • Used to make section views clear and avoid confusion
  • Associated with objects that have holes, ribs, spokes, or lugs in any combination equally spaced in a circular fashion
  • Not projected orthographically to section view
  • Examples to follow

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conventional hole revolutions
Conventional Hole Revolutions
  • Note no hidden lines

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conventional rib revolutions
Conventional Rib Revolutions
  • Note: Ribs not crosshatched

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