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3.11 Making an Isometric Drawing

Rectangular objects are easy to draw using box construction, which consists of imagining the object enclosed in a rectangular box whose sides coincide with the main faces of the object. For example, imagine the object shown in the two views in the Step by Step feature at right enclosed in a construction box, then locate the features along the edges of the box as shown.

The Step by Step feature on the next page shows how to construct an isometric drawing of an object composed of all “normal” surfaces. Normal is used technically to mean “at right angles.” A normal surface is any surface that is parallel to the sides of the box. Notice that all measurements are made parallel to the main edges of the enclosing box—that is, parallel to the isometric axes. No measurement along a nonisometric line can be measured directly with the scale, as these lines are not foreshortened equally to the normal lines. Start at any one of the corners of the bounding box and draw along the isometric axis directions.


3.43 Isometric drawings are not typically dimensioned. When they are, the dimensions should appear in the same plane as the isometric axes and read from the bottom of the sheet or aligned in the isometric planes. (Courtesy of Brandon Wold.)

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