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Isometric Sketching | Up
Utilitiesman Volume 01 - Manual for electric, plumbing, water and other utilities | Next
Figure 1-5. Interior Electrical Plan |
Figure 1-4.—Structural plan wall sections.
isometric drawing, you have the option of drawing
it to scale.
The isometric drawing follows certain rules or
conventions to show three dimensions on a flat surface.
These rules are as follows:
1. Vertical lines in an orthographic elevation
remain vertical in an isometric sketch.
2.
Horizontal lines in an orthographic elevation are
projected at an angle of 30 degrees and 60 degrees in an
isometric drawing.
COMPARISON OF ISOMETRIC AND
ORTHOGRAPHIC DRAWINGS
Compare the simple rectangular block shown
in the orthographic representation in view A,
figure 1-7, and the three-dimensional-view
isometric representation in view B. Notice that the
vertical lines of the orthographic drawing and
isometric drawing (views A and B) remain
vertical. The horizontal lines of the orthographic
drawing are NOT horizontal in the isometric
drawing but are projected at 30-degree and 60.
degree angles, and the length of the lines remain
the same in the isometric as they were in the
orthographic.
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