Textbook of Engineering Drawing, Second Edition

9.6 Textbook of Enginnering Drawing------------------

9.2.4 Non-Isometric Lines

In an isometric projection or drawing, the lines that are not parallel to the isometric axes are called
non-isometric lines. These lines obviously do not appear in their true length on the drawing and can
not be measured directtly. These lines are drawn in an isometric projection or drawing by locating
their end points.
Figure 9.7 shows the steps in constructing an isometric drawing of an object containing non-
isometric lines from the given orthographic views.
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Fig. 9.7

9.3 Methods of Constructing Isometric Drawing

The methods used are :

1. Box method.


2. Off-set method.