In the circuit board production process, the drilling step plays a key role in ensuring the accuracy and functionality of the PCB. Before starting, you need to prepare the cut sheet and drilling machinery. This involves the size, material and thickness of the appropriate sheet, as well as selecting the right drill bit and drilling tool. 
Place the PCB board correctly on the drilling machine table, and use the positioning fixture to ensure its accurate position. This is done to prevent drilling deviation and avoid adverse effects caused by subsequent assembly and welding. 
According to the design drawings of PCB, extract the corresponding drilling data, and accurately set the position of the drill bit. Each drill bit corresponds to a specific hole position and hole diameter. Then start the drilling equipment for operation. 
In drilling operation, it is necessary to keep the drill bit stable and the penetration rate uniform, so as to avoid problems such as drill bit fracture or hole position deviation.