6 Section Views

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• Explain the characteristics of a drawing that features a full section view.

• Describe the characteristics of a half section view.• Describe the characteristics of an offset section

view.• Identify the characteristics of a view that features a

broken-out section.• Identify the characteristics of a sectional view that

features aligned features.

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• Compare revolved sections and removed sections and identify the characteristics of these sections.

• Explain conventional practices applied to section views.

• Identify the proper representation of partial sections and outline sections.

• Identify the proper representation of separate parts in an assembly section view.

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Section Views

• Created by an imaginary cutting plane slicing through the material

• An orthographic view

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Section View Lines

• Lines used in section views:– Section lines– Cutting-plane lines

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Full Section View

• Section view that cuts “fully” through a part• Often through the central axis or center plane

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Half Section View

• Section view that cuts “halfway” through a part• Often removes a quarter of the object

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Offset Section View

• Section view with a cutting plane that is offset through important features

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Aligned Section View

• Section view cutting through a cylindrical object with an odd number of features

• Some features are aligned with a main vertical axis

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Broken-Out Section View

• Section view with a cut portion broken out• Does not cut “fully” through the part• Requires a short break line

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Revolved Section View

• Section view that cuts “fully” through a cross-sectional shape

• Shape is revolved directly on the regular view

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Removed Section View

• Section view shown out of projection with the regular views

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Conventional Practice in Section Views

• Even though a rib is cut, section lines do not appear in that area

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Sections in Assembly Drawings

• Section view of assembled parts• Requires section lines at different spacing and

angles

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• What identifies a full section view?

One-half of the object is removed

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• What identifies a half section view?

One-quarter of the object is removed

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• What is an offset section view?

A section view in which the cutting plane is not a single plane, rather offset through important features.

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• On which type of object is an aligned section typically drawn?

A cylindrical object with an odd number of features

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• What is a broken-out section?

A section view where a small portion of a part is exposed to show interior construction.

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• What is the difference between a revolved section and a removed section?

They are similar, but a removed section is shown in another place on the drawing, whereas a revolved section is shown directly on the view.

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• What is a conventional practice?

When a drafter breaks the rules or principles of projection for the sake of clarity, but standard references outline rules for the exception.

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• What is an outline section?

A section view in which the section lining is only drawn along the visible lines.

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• How are individual parts identified in a section view of an assembly?

Differing angles and spacing of section lines is used for each unique part.