Geometric Characteristics of Tungsten Carbide Drill Bit Ⅳ

In last part we know that the lip angle of a tungsten carbide drill bit changes with the point angle and determines cutting speed, and the drill bits have various lengths according to their purposes. This part will go on discussing the geometric characteristics of tungsten carbide drill bits.

5. The shank: different shapes of shank are used for tungsten carbide drill bits. Some are simply the most appropriate for the chuck used; in other cases particular combinations of shank and chuck give performance advantages, such as allowing higher torque, greater centering accuracy, or efficient hammering action. Most drill bits for consumer use have straight shanks. For heavy duty drilling in industry, bits with tapered shanks are sometimes used.

6. The diameter-to-length ratio of the tungsten carbide drill bit is usually between 1:1 and 1:10. Much higher ratios are possible (e.g., "aircraft-length" twist bits, pressured-oil gun dril bits, etc.), but the higher the ratio, the greater the technical challenge of producing good work.

(To be continued. This article is divided into several parts. Here is part 4. For part 3, please refer to http://news.chinatungsten.com/en/tungsten-information/80548-ti-10418; for part 5, please refer to http://news.chinatungsten.com/en/tungsten-information/80550-ti-10420)

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