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

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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

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.
• 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.

### Section 1:Orthographic Projection & Multi-view Drawings

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
• 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
• 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
• Each view has a specific location as to where it is placed in reference to others.
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
Examples

INCORRECT

CORRECT

Guided Practice:
• Create a multi-view drawing of this object.
• Label each view of your drawing.
Guided Practice:
• Create a multi-view drawing of this object.
• Label each view of your drawing.
Independent Practice:
• Create a multi-view drawing of the following two objects.
• Label each view of your drawings.

### Section 2:Line Types &Precedence of 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:
• Thin, dashed line
• Used to show hidden features within an object which can not be seen from the outside of the object.
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: The order in which different line types appear in an drawing based on importance.
Guided Practice:
• Create a multi-view drawing of this object.
• Label each view of your drawing.
• Include visible, hidden, and center lines
Guided Practice:
• Create a multi-view drawing of this object.
• Label each view of your drawing.
• Include visible, hidden, and center lines
Independent Practice:
• Create a multi-view drawing of the following two objects.
• Label each view of your drawings.
• Include visible, hidden, and center lines