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New type PCB micro drill

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Update time : 2017-11-06 17:37:20
In the printed circuit board (PCB) industry, the diameter of the drill is less than 3.175mm commonly known as micro-drill, referred to as micro-drilling. This kind of micro-drill is usually made of cemented carbide. At present, the conventional PCB drill has two symmetrical cutting edges and two symmetrical spiral grooves, which are divided into ST and UC according to the shape of the front end of the drill.
PCB micro drill bit
The greater the ratio of length to diameter, the greater the tendency to bend. Reducing the aspect ratio can reduce the flexing force and prevent the bit from breaking and increasing the hole diameter error. Usually the hole depth is more than 3 times the diameter is "deep hole", while the micro-drill hole depth generally exceed this limit, the deeper hole requires bit has a larger aspect ratio. At present, it is theoretically possible to produce PCB micro-drills with a minimum diameter of 0.05 mm. The conventional double-edged drill two helical groove forms weaken the rigidity of the drill bit, and easily breakable drills when the drill diameter is small. Therefore, in recent years single slot, , Multi-blade and other micro-drill structure.