Dimensional accuracy of the steel test method

One kind of three-dimensional precision steel test method, the following steps: a: mark measurement points on the primary node steel, and collecting three-dimensional coordinates of each node to form a set of measurement points; II: Steel transferred in the computer theoretical models, to give the theoretical point coordinates and the measuring point corresponding, to form a theoretical point set; 3: select any four measuring points not in the same plane and four theoretical points corresponding to the calculated initial parameters of the coordinate transformation; four: calculating the optimum coordinate conversion parameters least square method with constraints; five: optimal parameter set points for the measured three times a coordinate rotation and translation calculated according to the measured point to the vicinity of the theoretical conversion set point set, and a new point set; six: analysis theory Found point set and the set point coordinates after conversion contrast, the respective deviation value obtained steel. The present invention can accurately analyze the three-dimensional deviation of each measurement point of steel, steel to facilitate size adjustment, greatly improving work efficiency.