Orthographic Projections, ContinuedIsometricprojectionsThe term isometric means equal measure. When principal edges or axesmake equal angles with the plane of projection and are equally foreshortened,the result is an isometric projection. Because all angles and lengths areequal, you can used the same scale for the entire layout. The three edges thatintersect nearest the location of the observer are known as the isometric axes(O) and are 120° apart. The three surfaces shown are referred to asisometric planes. Lines parallel to the isometric axes are called isometriclines. Lines not parallel to the isometric axes are called nonisometric lines.You can generally draw isometric projections without additional auxiliary orrevolved views. Most exploded views use isometric projection. Isometricaxes and isometric lines are easily constructed with a 30°/60° triangle.Isometric projection is the most frequently used type of axonometricprojection.Figure 6-14 is a cube in isometric projection.Figure 6-14.—An isometric projection of a cube.Continued on next page6-17

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