SECTIONING - Sectional Views

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Sectional Views

 

Lecture content

What is a section view?

 

A sectional view or a 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.

 

What is this? An ugly rock? Hover your mouse over the image and find out.

 

Geode

 

Lecture content

Creating a section view.

 

  1. The part is cut using an imaginary cutting plane.
  2. The unwanted portion is mentally discarded exposing the interior construction.

 

Cutting plane

Section view example

 

Section view drawing

 

Lecture content

Lines used in section views.

 

Cutting Plane Line: Used to show where the object is being cut. (Phantom line type)

 

Cutting plane line type

 

Lines used in section views

 

Section Lines: Used to indicate where the cutting plane cuts the material. Section lines are thin and the symbols (type of lines) are chosen according to the material of the object. Section lines are generally drawn at a 45° angle.

 

Section line symbols

 

Lecture content

Rules of Sectioning

 

Rule 1: A section lined area is always completely bounded by a visible outline.

 

Rule 2: The section lines in all areas should be parallel. Section lines shown in opposite directions indicate a different part.

 

Rule 3: All the visible edges behind the cutting plane should be shown.

 

Rule 4: Hidden features should be omitted in all areas of a section view. Exceptions include threads and broken out sections.

 

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