In the first part, we discovered some basic and common types of drill bits, including twist bit, tile bit and masonry bit. They are manufactured for drilling through almost all of the materials and are suitable for many familiar works. However, as you start working on some more complicated DIY or home-improving project, you should know that some other drill bits types are more uncommon and are designed for specific advanced purposes. Getting to learn how to use them probably will help you become a better driller.
1. Flat wood drill bits
A flat wood bit has the ability to cut through the material and form a wider, flat-bottom hole with an addition mini hole at the center. The center part of the bit helps us mark the location we want to cut through, while both side parts help us to widen the hole. As a result, this drill bits type is most effective when the screw has a shape that need to be recessed in the bottom of the hole.
Similar to any other drill bits, a flat wood drill bit has its set drawbacks. Firstly, it can break the backside of the wood into many small fragments, so we need a backing board to reduce this. The second drawback of flat wood drill bits is that even if they are designed to drill large hole, their shape makes it harder to widen an existing hole.
2. Hole saw drill bits
I think all of us can imagine how a hole saw bit looks like after hearing its name. A hole saw drill bit is simply a combination of a normal drill bits and a hole saw around. These special drill bits come in a variety of diameters and tooth sizes and they have the ability to form large, clean and smooth diameter holes.
A hole saw drill bit would be at its best when drilling with low RPM and a minimal force, because you will not want the saw to slip out of the spot you are drilling. If the drill bit has already cut through the material but the blade hasn’t, you should flip the material upside down and let the hole saw blade do its work.
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3. Spur point drill bits
Sometimes you can hear people call this a wood bit or dowel bit as it is produced mainly for wood-cutting purposes. It has a center bit, which help us mark the drilling location, two raised spurs to keep the hole straight, and the spirals mission is to remove wood fragments from the hole and keep the hole smooth and clean.