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W3L6 - Coggle Diagram
W3L6
3D Design Drawings
Isometric Drawing
Meaning: Isometric = Equal measure
Principal edges equally inclined to viewer
Edges shown in true length
Axes divided by 120° angles
Vertical lines remain vertical
Views in Axonometric Projection
6 possible views: Front, Back, Top, Bottom, Left, Right
Common combination for full representation:
Front + Top + Right Side Views
Optional combinations based on detail:
Front + Bottom + Right (if bottom has more details)
Some views omitted due to symmetry:
Back is inverse of Front
Bottom is inverse of Top
Left is inverse of Right
First Angle Projection
Object between observer & projection plane
Views projected onto opposite side of plane
Third Angle Projection
Projection plane between observer & object
Views projected onto same side of plane
Types of Lines in Engineering Drawings
Visible Lines
Represent visible edges/features
Solid, thick lines
Hidden Lines
Represent features not visible in view
Dashed lines
Center Lines
Indicate centers of holes, cylinders, symmetry
Alternating long and short dashes