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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. PCB 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 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.
厦门中钨在线科技有限公司一直致力于生产高质量的硬质合金产品,如果您有任何相关的问题或者询价,欢迎致信 sales@chinatungsten.com , 或致电:0592 5129696
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