The drill types of PCB drill bit control drilling machine: the drill bits for PCB drilling include straight shank Fried Dough Twists drill, fixed shank Fried Dough Twists drill and fixed shank shovel drill. Straight handle Fried Dough Twists drills are mostly used for single head drilling machines to drill simple printed boards or single panels. Now they are rarely seen in large printed board manufacturers, and their drilling depth can reach 10 times the drill diameter. When the substrate layer is not high, using a drill sleeve can avoid drilling deviation. At present, most manufacturers use CNC drilling machines, which use fixed shank drill bits made of hard alloy and can achieve automatic replacement of drill bits. High positioning accuracy, no need to use drill sleeves. Large helix angle, fast chip removal speed, suitable for high-speed cutting. Within the full length range of the chip removal groove, the diameter of the drill bit is an inverted cone, resulting in less friction with the hole wall during drilling and higher drilling quality. The common drill stem diameters are 3.00mm and 3.175mm.

PCB drill bits are mainly used for PCB manufacturing: printed circuit boards (PCBs) are made of several layers of resin material bonded together, and are internally wired with copper foil. There are 4, 6, and 8 layers. Drilling accounts for 30-40% of the cost of printed circuit boards, and mass production often requires specialized equipment and drills. A good PCB drill bit is made of high-quality hard alloy material, which has excellent characteristics such as high rigidity, high hole position accuracy, good hole wall quality, and long service life