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Isometric & Orthographic Projections - Coggle Diagram
Isometric & Orthographic Projections
Isometric Projection
3D design through the use of three-dimensional drawings, the drawings are also known as axonometric projection
Isometric Axes
In the image on the left, the three axes shown (in blue, red and green) are 120° apart.
Orthographic Drawings
A simple way of representing engineering design drawings is by using orthographic projections. Orthographic projections are a collection of 2D drawings used to define a 3D model.
six (6) possible projections
Front, Back, Top, Bottom, Left, and Right Views.
Three of these views can give us a complete representation
First and Third Angle Projections
First and Third Angle Projections
first and third angle projections are methods used to represent three-dimensional objects in two dimensions
first angle projection, the object is placed between the observer and the plane of projection
third angle projection, 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 lines
represent features of an object that are visible in a particular view.
typically drawn as solid, thick lines to ensure they stand out clearly on the drawing
Hidden lines
represent features that are not visible in a particular view.
lines are usually drawn as dashed lines to differentiate them from visible lines.
Center lines
indicate the centers of holes, cylinders, and other symmetrical features
lines are typically drawn as alternating long and short dashes.