What are axonometric drawings? How many are there? What are their respective features?
I. formation of Axonometric drawingsA axonometric drawing is a Cartesian coordinate system of space objects and their spatial positions, which is projected onto a single projection surface in parallel with the projection method without projecting from any coordinate plane. As shown in figure 5.1-1.An axis chart having all the properties of parallel projection. Such as:1. parallelism: parallel lines of objects on objects, parallel to each other on axonometric drawings.2. contrast: the ratio of the length of the two line segment on the object or the two line in the same line remains unchanged on the axonometric drawing.3., solid shape: the parallel axis of objects on the projection surface of the line and plane, in the axis of the map to reflect the real length and shape.When the projection direction S is perpendicular to the projection surface, a positive axis map is formed; when the projection direction S is tilted to the projection surface, an oblique axonometric drawing is formed.
Isometric drawings are drawn as follows:Axonometric projection projection direction of S axis perpendicular to the projection between P, and determine the position of an object in space three coordinate planes and axonometric projection surfaces are inclined, on the three coordinate axis and the angle of axonometric projection is equal, the object plane parallel to the plane of the three coordinate isometric projection of the shape and size of the changes are the same, therefore, the object is quite a strong sense of stereo projection axis.
The item is wrong and should be isometric.Definition of isometric drawings:The body is positioned so that its three coordinate axes have the same angle (about 35 DEG 16 ') with the axonometric projection mask, and then the axonometric projection surface is projected as a positive projection. The axonometric drawings made in this way are called isometric drawings.
