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Orthographic Projections
Dr. Hodge Jenkins
MAE 205
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Projection and Views
(E) Isometric
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Projection and View Types
Orthographic
Projection
Views
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Oblique
• Front, Side , Top views
• Flat 2-D Front & Back
• Side slopes at 30-45 degree angle
• Circles only round on Front &
Back
• Front is drawn to scale
• Side length is often shortened to
half scale
• Best for hand sketching
• NO HIDDEN LINES
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Isometric
• 2 sides and a top view
• Each side is drawn to scale
• Circles always appear as ellipses
• Each side is at a 30-degree angle
from horizontal as shown
• Common for use in engineering
• assembly drawings
• NO HIDDEN LINES
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Motor Assembly Drawing (Isometric)
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MULTI-VIEW ORIENTATION6 ORTHO VIEWS POSSIBLE
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MULTI-VIEW ORIENTATION3 VIEW ARE TYPICAL
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Orthographic ProjectionsMULTI-VIEW ORIENTATION: 3 VIEWS
• 3 or 6
2-D VIEWS
• MIN. OF 3
VIEWS
• FRONT, TOP
SIDE
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Orthographic Projections
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LINE WEIGHTS AND PRIORITY
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Hidden Lines& Center Lines
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Views have proper
orientation& locations
(FRONT, TOP, SIDE)
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Looking Isometric Examplesto create Isometrics
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More Examples
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Isometric: Next Topic