Tungsten Carbide Micro Drills and Micro DrillingⅠ

Micro drilling is characterized not just by small drills but also a method for precise rotation of the micro drills and a special drilling cycle. In addition, the walls of a micro drilled hole are among the smoothest surfaces produced by conventional processes. This is largely due to the special drilling cycle called a peck cycle.

The smallest tungsten carbide micro drills are of the spade type. The drills do not have helical flutes as do conventional tungsten carbide drills and this makes chip removal from the hole more difficult. Drills with a diameter of 50 micrometers and larger can be made as twist drills. Drills smaller than this are exclusively of the spade type because of the difficulty in fabricating a twist drill of this size.

 (To be continued. This article is divided into several parts and this is part 1, for part 2 please refer to http://news.chinatungsten.com/en/tungsten-information/79982-ti-10251)

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