AXONOMETRIC PROJECTIONS (from the Greek words "axon", which means "axis", and "metreo", which means "measure" * EN: axonometric projections; DE: axonometric Projektionen; FR: projections axonometriques; ES: proyecciones axonometricas; RU: аксонометрические проекции) are the visual images of the object using its parallel projection on the plane together with the associated system of the three mutually orthogonal coordinates. According to the dependence on the angle s between the direction of the projection and the plane of the projection, they distinguish the right angle and oblique angle axonometric projections.
The rectangular spatial coordinates (and the basic dimensions of the object, which is depicted, which are parallel to them) are distorted during the axonometric projecting in the certain proportions. They distinguish the axonometric projections isometric (the indicators of the distortion along the all axes are identical), dimetric (identical along the two axes), trimetric (are different along the all axes). During the oblique projecting (according to the Polke theorem), they adopt any three straight lines on the plane of the drawing that intersect in the one point as the axonometric axes, and the three arbitrary finite numbers, which ensure the simplicity of the construction, visibility, and convenient measuring of the drawing, as the indicators of the distortion.
The axonometric projections are used in the mining craft for the imaging of the certain complicated modules of the mining workings (Figure) or of the geological structures, and for the preparation of the special plans of the mining works (ventilation, emergency, power equipment, and others).
The primary source materials for the construction of the axonometric projections of the mining workings and the geological structures are the horizontal (level plans) and vertical cross sections. They perform the construction of the axonometric images according to the coordinates with the help of the auxiliary grids and the stencil axonographs.
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