METHOD OF CNC MILLING PCB

The technology of circuit board CNC milling includes selecting the feed position, compensation method, positioning method, frame structure, and CNC tool point, which are all important aspects to ensure the accuracy of milling. The following are the precision control methods of PCB board milling. Feed direction and compensation method: When milling the external contour of the printed circuit board, feed in the opposite direction. This is commonly referred to as up-milling. When milling frames or slots inside PCB circuit boards, the surface milling method is used. Positioning methods can be divided into two types; one is internal positioning, and the other is external positioning. Positioning is also very important for process designers. Generally, the positioning plan should be determined during the early production of PCB circuit boards. Internal precise positioning is a commonly used method. To put it bluntly, internal positioning is to select mounting holes, plug holes, or other non-metallic holes in the printed circuit board as positioning holes. The relative position of the holes strives to be on opposite corners and try to choose large-sized holes. Plated through holes cannot be used. Under the premise of ensuring the precise positioning of the printed circuit board, the fewer the total number of nuts, the better.