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3 AXONOMETRIC PROJECTIONS
3.1 BASIC CONCEPTS, DETERMINATIONS, CLASSIFICATION

Practical receptions of construction of visual images– axonometric projections and technical
drawings are based on the theory of axonometric and perspective projections.
Visual images have a large practical value, they are widely used in different spheres of
activity. A necessity in an visual image arises up at reading of drawing of an article, when it is
difficult to imagine its structural form. A person who is not familiar with the methods of the
ortogonal planning on three planes of projections, is hardly be able to imagine immediately what is
shown in fig. 3.1.

Figure 3.1 – Visual images

Axonometric projections are used to facilitate the process of spatial imagination. The example
of this drawing is shown in figure 3.2. The view of a cube with a cut in a axonometric projection
and its projection on three planes is shown.

Figure 3.2 – Axonometric projections

Consequently, with the help of axonometric projections we can show the structure of the
whole article and the structure of its separate parts, technological processes of treatment,
assembling and installing. Axonometric projections are used for the transmission of the technical
project of an author while planning and constructing new articles.
While looking at the visual depiction of an object, you get to know about it only on the basis
of the unique appearance which is presented from one immobile point of view. Most of the
component parts of an object, which find out its form on the whole might be seen on the visual
depiction. Separate parts of an object must not fully close other its parts.
A view, got at parallel projections of an object together with the axes of rectangular co-
ordinates of х, y, z to which it is taken in space, on some plane 0 П is called an axonometric

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