·Carving and milling operating method ·Hardware processing and production process flow ·What are the main objects for CNC lathe? · Main classification of vertical machining centers for CNC gantry drilling and tapping machines ·CNC CNC processing function ·What are hardware accessories? ·The causes of bearing problems in CNC engraving and milling machines ·The roughness of the workpiece of the high -speed processing center ·Advantages of CNC processing ·Explain the pinhole problem of hardware die castings?