These heavy-duty milling machine milling head can simultaneously process several surface. Each milling head has a separate motor (power up to 150 kW), speed change mechanism, the control mechanism and the spindle components. Processing, the workpiece and subsequently installed in the table for vertical feed motion. Heavy-duty milling machine (table 6 × 22 m) of the total weight of 850 tons. Milling machine and some variants to accommodate different processing objects. ① gantry milling and boring machine: the beam milling can be boring with milling and boring head, the shaft (sleeve or ram) to the feed motor for axial movement and a fine-tuning device, fine-tune the speed as low as 5 mm / min. ② bridge milling machine: processing table and the workpiece does not move, while the gantry moves. It features small footprint, carrying capacity, gantry travel up to 20 meters, or special expertise to facilitate the processing of heavy workpieces.