The parallel and lengthy relationship between the drawing elements of the constructed X and Y parallel matrix was solved to remove redundant elements in the curve chain and labeled the absolute dimensions of the remaining valid elements. It divides the dimensions into the absolute dimensions within the cure chain and the relative dimensions between the curve chains.
According to the internal relation between the features of 3D model feature and elements of 2D drawing, the curve chain was established to reflect the geometric topological structure between the elements.
An automated method based on the curve chain was proposed for dimensioning of engineering drawings for the mechanical products.
