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Isometric & Orthographic Projections - Coggle Diagram
Isometric & Orthographic Projections
Isometric
Equal measure
Isometric drawing
Constructed on 3 axes
120 degree from each other
Orthographic Drawings
Orthographic Projections
Simple way of representing engineering design drawings
6 possible views
Front + Top + Right Side View combination is commonly used
First and Third Angle Projections
First Angle
object is placed between the observer and the plane of projection, resulting in the views being projected onto the opposite side of the plane.
Third Angle
the plane of projection is between the observer and the object, causing the views to be projected onto the same side of the plane.
Types of Lines in Orthographic Drawings
Visible Line
Represent feature of an object that are visible in a particular view
Drawn as solid thick line
Hidden Line
represent features that are not visible in a particular view
drawn as dashed lines
Center Line
indicate the centers of holes, cylinders, and other symmetrical features.
drawn as alternating long and short dashes