Coordinate planes for main types of product drawing

The international organization for Standardization has developed a series of standards for the implementation of electronic geometrical models of products, where coordinate systems have been introduced for the first time. However, it is not considered in the electron models that the different functional purposes of both the coordinate planes and axis are differed. In order to improve the quality of project documentation developed with the help of electronic models, the geometric specifications of coordinate systems were determined, coordinate planes and axes were established to perform six basic 2D projections of the product. A new geometrical specification "informativeness" is introduced as the number of product degrees of freedom restricted by the base, coordinate plane or axis. The coordinate system of the product is materializes by a set of its design datums with a total informativeness of 6. Coordinate planes of the rectangular coordinate systems have the informativeness of 3,2 and 1, the coordinate axes -4,2 and θ (zero).