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Isometric & Orthographic Projections - Coggle Diagram
Isometric & Orthographic Projections
Isometric Projection
Definition: A 3D drawing where all axes are drawn at 120° to each other
Key Features
3 sides visible at once (front, top, side)
Equal scale on all axes
No perspective distortion
Used For
Concept design
Visualizing 3D objects quickly
Orthographic Projection
Definition: A 2D representation of each side of an object
Key Views:
Front view
Top view
Side view (left or right)
Layout :
Typically uses third-angle projection
Views arranged in a grid
Used For:
Manufacturing drawings
Engineering and architecture plans
First and Third Angle Projections
To represent three-dimensional objects in two dimensions. These projections are essential for accurately conveying the dimensions and geometry of a part or assembly.
First Angle is commonly used in European countries.
The orthographic projections are on the opposite side.
Third Angle Projection is commonly used in U.S.
The orthographic projections are on the same side.
Types of Lines in Orthographic Drawings
Hidden lines are used to represent features that are not visible in a particular view. These lines are usually drawn as dashed lines to differentiate them from visible lines.They help to convey the internal or hidden features of an object, which are not directly observable from the outside.
Center lines are used to indicate the centers of holes, cylinders, and other symmetrical features. These lines are typically drawn as alternating long and short dashes.
Visible lines are used to represent features of an object that are visible in a particular view. These lines are typically drawn as solid, thick lines to ensure they stand out clearly on the drawing.