Multiview Drawings

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• Multiview Drawings

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• Explain the relationship between an orthographic
  projection and a multiview drawing.
• Explain three visualization principles for
  multiview drawings.
• Identify and define the three dimensions of an
  object.
• Define the three regular views.

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• Identify three principal planes of projection.
• Identify the three types of flat surfaces.
• Explain characteristics of cylindrical surfaces.
• Explain characteristics of fillets, rounds, and
  runouts.
• Identify differences between third-angle and
  first-angle projection.

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Orthographic Projection

• Created by projecting the points of a
  three-dimensional object onto a two-dimensional
  plane

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Multiview Projection

• Orthographic projection consisting of
  systematically arranged views to describe an
  object

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Definition Summary

• Orthographic projection, multiview projection,
  and multiview drawing are interchangeable terms
• Represents the main type of drawing views used in
  industrial prints

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Selection of Views

• Six normal views
• Front
• Back
• Top
• Bottom
• Right side
• Left side

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Selection of Views

• Three regular views commonly used in education
• Front
• Top
• Right side

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Selection of Views
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Dimensions of an Object

• Height is how tall the object is, as measured on
  the front view
• Width is how wide the object is, as measured on
  the front view
• Depth is how deep the object is from front to
  back
• Each dimension appears twice in the three regular
  views
• Length and breadth are terms not used

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Dimensions of an Object
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Three Orientation Possibilities

• Perpendicular
• Parallel
• Inclined

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Three Projection Possibilities

• Edge view
• True size and shape
• Foreshortened shape

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Three Principal Planes of Projection

• Frontal plane
• Horizontal plane
• Profile plane

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Three Types of Flat Surfaces

• Normal

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Three Types of Flat Surfaces

• Inclined

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Three Types of Flat Surfaces

• Oblique

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Cylindrical and Curved Surfaces
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Meanings of a Multiview Line

• AEdge view of a flat or curved surface
• BIntersection of two surfaces (just an edge)
• CMaximum contour of a curved surface

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First-Angle and Third-Angle Projection

• Dividing space into quadrants
• Historical development of projection theory used
  two planes to divide space
• After projections, the two planes are revolved
  into one, with quadrants two and four collapsed

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First-Angle and Third-Angle Projection
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Third-Angle Projection

• Used in the United States

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First-Angle Projection

• Used in Europe

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• What is the relationship between orthographic
  projection and a multiview drawing?

Each view in a multiview drawing is based on
orthographic projection
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• What are the three basic dimensions of any object?

Height, width, and depth
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• What are the three regular views on a multiview
  drawing?

Front, top, and right side
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• What are the three principal planes of projection?

Frontal, horizontal, and profile
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• Briefly describe the three visualization
  principles for multiview drawings.

Principle One A flat surface is oriented
perpendicular, parallel, or inclined to a plane
of projection. Principle Two All flat surfaces
appear as either a line, true size and shape, or
foreshortened. Principle Three All surfaces
appear in every view.
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• What are the three types of flat surfaces?

Normal, inclined, and oblique
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• Briefly explain the characteristics of
  cylindrical surfaces in multiview drawings.

Cylindrical surfaces are made up of thousands of
elements. If a flat surface is tangent to the
cylindrical surface, no line appears at the
element of tangency.
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• Explain characteristics of fillets, rounds, and
  runouts.

Fillets are interior rounded edges. Rounds are
exterior rounded edges. A line may be shown in
projection for fillets and rounds if needed for
clarity. Runouts occur when a rounded corner
intersects a curved surface and the edge tails
out. Runouts are usually represented in
projection.
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• What is the difference between third-angle and
  first-angle projection?

In third-angle projection, the object resides in
the third angle of space, resulting in the top
view being located above the front view. In
first-angle projection, the object resides in the
first angle of space, resulting in the top view
being located below the front view.