Introduction%20to%20Engineering%20Section%20Views%20-%201

1
Introduction to EngineeringSection Views - 1

• Agenda
• Why section views are needed
• Types of section views
• Reference
• Bertoline, Chapter 3, Sections 3.1-3.4

2
Section Views

• 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.

3
Types Of Section Views

• Full sections
• Half sections
• Offset sections
• Broken-out sections
• Revolved sections
• Removed sections

4
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 is
  removed

Figure 3.3
5
Section Lines

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

Figure 3.9
6
Section Lines

• Section lines can be used to show different
  types of materials or different parts of the same
  material.
• Refer to text for a complete list (Figure 3.8)

7
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

8
Full Section View

• Show cutting plane in the top view
• Make a full section on the front view

9
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.

10
Half Section View

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

11
Half Section View

• Half Section used mainly for symmetric objects

12
Video 17Drawing Full and Half Sections
13
Assignment 32 Full Half Sections Handout

• Read Bertoline, Chapter 3, Sections 3.1-3.4
• Assignment 32 (Start in Class)
• Follow the instructions to make full and half
  section views on the handout provided.
• On a piece of isometric grid paper, draw an
  isometric view of a full section of the object in
  Assignment 32.