Drill Bit Information

There are numerous reasons to use different drill bits. Different bits are created for certain tasks such as expanding holes making holes or finishing holes. Selecting the right bit for the job makes the project easier.

Some bits are used to start a hole. Some are designed for hard materials as are some designed for the softer material. Based on the material and the type of hole to be drilled there is a bit designed specifically for each job.

Twist drill bits are used to drill holes in various materials such as wood plastic and metal. The bits come in different sizes. The common sizes are .05 mm in length going up to 100 mm in length. The sizes of the bits are calculated on the diameter of the hole the twisted bit will cover. An example of this calculation is a bit sized .05 mm for the .002 mm diameter hole. The twist drill bit of 100 mm is for the 39 mm.

The point angle of the drill bit is another consideration. The different point angle of the drill bits adds more applications. A 118-degree point angle bit is considered the most flexible point angle. Even though the bits can be used for different purposed there are bits available for specific tasks and specialties.

Then a twisted drill bit does not have a point angle it is used for making holes with a flat bottom. It is important to realize these types of bits are sensitive to the positioning of the bit and any movement or variation while drilling the hole can cause mistakes for the intended hole.

The center drill bits are available in sizes one to six. They are used more frequently in hard materials such as metal. The bits have two purposes. The first purpose is to start a begin hole for twist bits with the 150 degree angle for core drill bits for larger bits and for reamer drill bits. The center bit is used to outline the center hole and prepares it for making the holes in harder materials. The second purpose for the center bit is to create a conical indentation for work with a lathe project.