Tungsten Carbide Brad Point Drill Bit Ⅳ

In last part we know that tungsten carbide brad point drill bits have two types and the drill bits for soft wood have round outlining spurs while those for hard wood have sharp ones, and we shall not mix them up in different tasks..This part we will explain the two basic types of brad point drill bit.

Another feature of the tungsten carbide brad point drill that could affect its cutting ability is the actual brad or pyramid point in the center. Although the sole purpose of the brad point is to guide the drill through the material and keep it running straight, the shape of the brad point can affect the results. The brad itself does not actually cut the wood. It mainly scrapes and pushes the wood aside. If the base of the brad point is too thick or fat, the drill will be much harder to push especially in hardwoods. A brad that is too thin will allow the drill to cut freely but may break off in the process. It is also very important that the brad is exactly centered at the point of the drill. An off-center brad can cause a drill to cut larger than it actually measures.

We often vary the length of the brad point to achieve different results. A longer brad can be used when a hole needs to be drilled on an angle instead of straight into the wood. Drilling as much as 45 degrees or even 60 degrees from vertical is possible by extending the length of the brad. A shorter than normal brad may be required in the case of a hole that needs to be drilled close to but not through the back of the material.

(To be continued. This article is divided into 5 parts, and this is part 4. For part 3 please refer to http://news.chinatungsten.com/en/tungsten-information/80398-ti-10362; for part 5, please refer to http://news.chinatungsten.com/en/tungsten-information/80400-ti-10364)

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