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Orthographic Projection, multi-view drawings, & Precedence of lines. North Carolina State University Spring 2013. What You Will Learn:. Define Orthographic Projection. Correctly label the placement of the six standard views of an object drawing.

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orthographic projection multi view drawings precedence of lines

Orthographic Projection, multi-view drawings, & Precedence of lines

North Carolina State University

Spring 2013

what you will learn
What You Will Learn:
  • Define Orthographic Projection.
  • Correctly label the placement of the six standard views of an object drawing.
  • Identify which views are needed when creating a multi-view drawing of an object.
  • Create a multi-view drawing with the correct views from a given object.
  • Identify different types of lines used for drafting.
  • Identify which line types have precedence over others.
  • Create multi-view drawings using different line types.
orthographic projection
Orthographic Projection
  • Orthographic Projection: (n) a parallel projection technique that creates a 2-D image of 3-D objects or structures on an image plane perpendicular to the lines of sight.
  • In The U.S. we use a method called Third Angle Projection
  • Used to represent all aspects of a 3-D object by only using 2-D drawings
glass box method
Glass Box Method
  • View each object as if it were in a glass box.
  • When unfolding the box you have the 6 views of projection.
the 6 views of projection
The 6 Views of Projection
  • Top – Looking down on an object (birds eye view)
  • Front – ALWAYS the most descriptive
  • Right Side – To the right of the front view
  • Bottom – opposite of the top
  • Left Side – opposite of the right
  • Back – opposite of the front
proper layout of a multi view
Proper Layout of a Multi-View
  • Each view has a specific location as to where it is placed in reference to others.
creating a multi view drawing
Creating a Multi-View Drawing
  • Only use the views necessary to visualize the full object. (Typically: top, front, right side)
  • Sometimes only two views are necessary such as when drawing a cylinder
examples1
Examples

INCORRECT

CORRECT

guided practice
Guided Practice:
  • Create a multi-view drawing of this object.
  • Label each view of your drawing.
guided practice1
Guided Practice:
  • Create a multi-view drawing of this object.
  • Label each view of your drawing.
independent practice
Independent Practice:
  • Create a multi-view drawing of the following two objects.
  • Label each view of your drawings.
visible lines
Visible Lines:
  • Thick and Bold
  • Often called construction lines or object lines
  • Used for the outer edges and visible features of an object.
hidden lines
Hidden Lines:
  • Thin, dashed line
  • Used to show hidden features within an object which can not be seen from the outside of the object.
center lines
Center Lines:
  • Thin lines with alternating long and short dashes.
  • Show the center of both visible and hidden circular features such as holes, cylinders, etc.
precedence of lines
Precedence of Lines
  • Precedence of Lines: The order in which different line types appear in an drawing based on importance.
guided practice2
Guided Practice:
  • Create a multi-view drawing of this object.
  • Label each view of your drawing.
  • Include visible, hidden, and center lines
guided practice3
Guided Practice:
  • Create a multi-view drawing of this object.
  • Label each view of your drawing.
  • Include visible, hidden, and center lines
independent practice1
Independent Practice:
  • Create a multi-view drawing of the following two objects.
  • Label each view of your drawings.
  • Include visible, hidden, and center lines