The rectifier bridge circuit consists of four rectifier diodes and four wire leads. The silicon diodes are quadratic in shape with a barrel-like cross-section. These diodes are rubber-edge coated for protection, but this characteristic hinders automatic transport and manipulation. The four diodes must be precisely positioned to ensure correct polarities, and must strictly account for the classification of the voltage range into quality classes composed of 3–7 levels. The assembly of rectifier bridges requires precise positioning to within ±0.05 mm. Because of labor shortages and quality variation characteristic of manually assembled bridges, robotized assembly was selected. All other alternatives were disregarded because of higher costs on the limited flexibility of automation equipment. The Seiko robot model RT 2000 was chosen for its high speed (1 s manipulation time for one diode), and for its high precision of positioning (± 0.05 mm.) The robot was equipped with vacuum gripper constructed in-house. The gripper contains a sensor for diode measurements and presence detection, as well as a control for blowing off dioded which might stick to the gripper. Before bridge-assembly, the diodes are stored in 16 × 58 matrix pallets to ensure that during the pick-up contact time of nearly 70 ms, automatic electronic testing is performed and repeated three times. This assures reliable results despite the presence of noise and industrial radio-magnetic hum. The diodes are assembled in special pallets containing 80 bridges (20 × 4) with pre-inserted lead wires. This work cell built around the robots serves five storage pallets at once, and there is one 40-min run, in which about 400 bridges are assembled. The robot controller works with the automatic tester based on the diode-classification microprocessor. This configuration allows for a complete statistical tally of all the diodes manipulated in a working day. The algorithm controlling the manipulation process involves the automatic generation of free positions for the diode tested in terms of the polarity, electronic parameter classification, and recent position in a bridge. The pick-up positions are selected by the program using a master scheme, with software options to account for empty positions and unsuccessfully retrieved diodes. These diodes activaté the gripper sensor, which in turn signals the robot controller to continue to the next pick-up position. In this manner, manipulation is made smoother, and time is saved. The method for determining vacant positions in the rectifier bridge pallets is also relevant. By using expert calculations, all the assembled locations of bridges (four diodes with two polarities) are erased at each step; only for vacant positions is the location saved. When a new vacant position is required, the algorithm for calculating the next position is activated.