Tungsten Carbide Brad Point Drill Bit Ⅴ

In last part we know that the shape of brad points is important to the cut effects of tungsten carbide brad point drill bits, which requires different features for specific tasks. This part will talk about the other applications of brad point drill bits in other materials.

Tungsten carbide brad point drill bits are ordinarily available in diameters from 3–16 mm (0.12–0.63 in).Brad point drill bits work also well in most plastics, nylon, fiber, fiberglass and many other man made materials. Conventional twist drill bits in a hand drill, where the hole axis is not maintained throughout the operation, have a tendency to smear the edges of the hole through side friction as the drill bit vibrates.

In metal, the tungsten carbide brad point drill bit is confined to drilling only the thinnest and softest sheet metals in a drill press. The bits have an extremely fast cutting tool geometry: no point angle and a large (considering the flat cutting edge) lip angle causes the edges to take a very aggressive cut with relatively little point pressure. This means these bits tend to bind in metal; given a workpiece of sufficient thinness, they have a tendency to punch through and leave the bit's cross-sectional geometry behind.

(The End. This article is divided into 5 parts, and this is part 5. For part 4 please refer to http://news.chinatungsten.com/en/tungsten-information/80399-ti-10363)

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