Axonometric projection is shown in Figure 2.3. This is the same as perspective projection except that the projectors are parallel. This
means that there are no vanishing points. In axonometric projection, the object can be placed at any orientation with respect to the viewer. For convenience, axonometric projection can be divided into three classes depending on the orientation of the object. These are trimetric, dimetric and isometric projections (see Figure 2.4).
Trimetric projection is by far the most common in that the object is placed at any position with respect to the viewer such that the angles c~ and [3 are unequal and the foreshortening in each of the three axes is unequal. The three sides of the cube are of different lengths.
This is shown in the left-hand drawing in Figure 2.4. The 'tri' in trimetric means three. In dimetric projection, the angles 0t and 13 are the same as shown in the middle drawing in Figure 2.4. This results in equal foreshortening of the two horizontal axes. The third vertical axis is foreshortened to a different amount. The 'di' in dimetric means there are two 'sets' of axes. The particular class of axonometric projection in which all the three axes are foreshortened to an equal amount is called isometric projection. In this case the foreshortening is the same as seen in the right-hand drawing in Figure 2.4. In this case, the angles a and 13 are the same
and equal to 30 ~ The foreshortening of each of the three a~:es is identical. The term 'iso' in isometric projection means similar.
Isometric projection is the most convenient of the three types of axonometric projection because of the convenience of using 30 ~ angles and equal foreshortening. Isometric projection will be considered in detail in the following section.
Engineering Drawing for Manufacture
by Brian Griffiths
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