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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

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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

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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 the interior of an object.

  • Full sections

  • Half sections

  • Offset sections

  • Revolved sections

  • Removed sections

  • Broken-out sections

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Cutting plane
Cutting Plane the interior of an object.

  • 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 the interior of an object.

  • Precedence of Lines

Center Line

Hidden Line

Object Line

Cutting Plane

Line

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Section lines
Section Lines the interior of an object.

  • 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 the interior of an object.

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 the interior of an object.

  • 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 the interior of an object.

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 the interior of an object.

B

A

A

SECTION B-B

B

Multiple Sectioned Views

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Half section view
Half Section View the interior of an object.

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 the interior of an object.

  • Half Section used mainly for symmetric objects

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Revolved sections
Revolved Sections the interior of an object.

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

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Removed sections

A the interior of an object.

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 the interior of an object.

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Offset sections
Offset Sections the interior of an object.

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

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Offset sections1
Offset Sections the interior of an object.

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Conventional revolutions
Conventional Revolutions the interior of an object.

  • 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 the interior of an object.

  • Note no hidden lines

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Conventional rib revolutions
Conventional Rib Revolutions the interior of an object.

  • Note: Ribs not crosshatched

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Conventional spoke revolution

Note: Spokes not crosshatched the interior of an object.

Conventional Spoke Revolution

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Holes and ribs in combination
Holes and Ribs in Combination the interior of an object.

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