Types: Isometric Sketch
The isometric projection is the basis for the typical three-dimensional engineering sketch. The three axes of the isometric sketch form mutual 120 degrees angles with each other (see Figure 1). Alternatively, there is a left axis at 30 degrees upward from the horizontal, a right axis at 30 degrees upward from the horizontal, and a 90 degrees vertical axis. The proportions along each axis are in the ratio 1:1:1. The term Isometric means equal (iso) length (metric). Circles on the isometric planes appear as ellipses in isometric sketches. Isometric grids are a convenient aid in sketching isometric drawings with both straight edges (see Figure 2) and circular features (see Figure 3).
College of Engineering at UT Austin
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