A new measuring system of flexible electronic checking fixture on industrial robot is proposed to overcome the disadvantages of the real special checking fixture commonly used in industrial production – high cost

poor flexibility and low automation. Vision sensor is fixed on the terminal tool of industrial robot which is taken as flexible automation platform. Teach the robot to run the programmed measuring path to get local result and calibrate the transformation relationship from every local sensor system to global system. Repetitive position error of robot in this process is one important influencing factor to the overall system accuracy. An optical precise measuring method is presented to amend the whole result real-timely that another camera is taken as control camera combined with global control points fixed on the supporting assembly to measure repetitive position error. Result is compared with CAD digital module in computer to realize the virtual flexible checking fixture function. Experimental result shows that the overall three-dimensional root mean square (RMS) error of fourteen space point is 0.101mm. The principle of method is reasonable. It can overcome the limitation of real checking fixture such as high cost

heavy waste and losing accuracy affected by anthropic factor and realize high accuracy

flexibility and automation checking measurement.