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Tungsten Carbide PCB Drills

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A great many holes of very small diameter must be drilled in printed circuit boards (PCBs) used by electronic equipment. Most PCBs are made of highly abrasive fiberglass, which quickly wears steel drills, especiallygiven the hundreds or thousands of holes on most circuit boards. Tosolve this problem, solid tungsten carbide twist bits, which drill quicklythrough the board while providing a moderately long life, are almost always used. Tungsten carbide PCB drill bits are estimated to outlast high speed steel bits by a factor of ten or more. Other options that are out on the market and used in some situation are a diamond drill bit, or a diamond coated drill bit.

In industry, virtually all drilling is done by automated machines, and the bits are often automatically replaced by the equipment as they wear, as even solid carbide bits do not last long. Tungsten carbide PCB drill bits typically mount in a collet rather than a chuck, and come with standard-size shanks, often with pre-installed stops to set them at an exact depth every time when being automatically chucked by the equipment.

Due to the high rotational speeds—these bits are used at 30,000 to 100,000 RPM or even higher—their small size, and the brittleness of the material, even the slightest wobble of an operator's hand will shatter one, as will accidental contact with almost any object. Due to their brittleness these bits cannot be used in a hand drill, and even most moderately expensive drill presses will have too low a speed and too much chuck wobble to use them without breaking them.

Resharpened and easily available tungsten carbide PCB drills have historically been used in many prototyping and home PCB labs, using a high-speed rotary tool (such as a Moto-Tool by Dremel) in a stiff drill-press jig. If used for other materials these tiny drills must be evaluated for equivalent cutting speed vs material resistance to the cut (hardness) as the drill's rake angle and expected feed per revolution are optimised for high-speed automated use on fiberglass PCB substrate.

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1.Tungsten Carbide
2.Tungsten carbide Bar
3.Tungsten carbide Rod
4.Tungsten Carbide Nozzle
5.Tungsten Carbide Button
6.Tungsten Carbide Inserts

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