It’s easier to get the job done right the first time if you know what drill bit to use and when to use it. However, since these tools are so versatile, there are a lot of different drill bits available for different uses. If you understand what each of them does, you can ensure the success of your project. Look no further if you are new to drilling and using drill bits. To make buying and using drill bits as easy as possible, we have put together the ultimate drill bit guide.
What is a Drill Bit?
A drill bit is a cutting tool used to create holes in materials by removing material from their surfaces, typically of circular cross-section. Various drill bits are available in various sizes and shapes that can drill holes into a vast array of materials.
Parts of Drill Bit
A drill bit has the following parts:
Point
The point on the end of the drill is shaped like a cone and it is used as the point of the drill. The point of the drill is generally 180 degrees in orientation.
Shank
There is an end to the drill called a shank that fits into the drilling machine and is used for driving the drill.
Body
Known as the body, the part of the drill that lies between the shank and the pointed end is called the body.
Tang
It is the part of the shank that extends into the spindle of the machine that is called the tang.
Flutes
It is the flutes that are found on the body of the drill that forms spiral grooves. As a rule, they perform three types of tasks: first, they cut metal to create cutting edges, then they make curls out of chip material, and finally, they make sure the cooling fluid reaches the cutting edge.
Land
The land is defined as the distance from the body to the body between the flutes, which goes the length of the body. Another term for it is the margin.
Body Clearance
Body clearance refers to the diameter of the part of the body that is slightly smaller than the diameter of the drill. When the drill is in contact with the hole, the friction between them is decreased.
Web
Webs are the parts of the flutes that separate them from each other during drilling.
Neck
The neck is the part that connects the shank of the drill to the body of the drill.
Types of Drill Bits
Carbide drill bits manufacturer makes numerous types of drill bits. These
Wholesale solid carbide drill bits can be:
Twist Drill Bits
The tip of a twist drill bit is a simple bevelled tip, with a straight shaft and no bend. Wood, composite boards, and metal can all be drilled with them. For the most part, you will be using drill bits up to about 12mm, so you should consider a set of HSS bits in a range of sizes. Keeping them in your toolbox after use will help prevent rust. Whenever possible, store them in metal cases. On twist drill bits designed specifically for wood, spur points are commonly found to help drill straight holes.
Masonry Drill Bits
With the use of a hammer action drill and masonry bits, you will be able to make holes in walls and solid floors that will be easy to repair. The shaft consists of a straight piece with a tooth at the tip. In addition to this, it will also help the drill bit to bite into the material more effectively, as it will remove debris from the hole as well. As you are most likely not going to use all three sizes: 5mm, 6mm or 7mm, it is unlikely that you will need to purchase a full set of masonry bits.
Flat Wood Bits
These are special bits of wood. These carbide drill bits manufacturers are designed especially for drilling larger holes. The diameter of these bits of wood ranges from less than 6mm to more than 40mm. Buying them as needed is fine; just store them in their plastic sleeves if you are not using them all.
Core Drill Bits
They are made by enclosing a metal cone and teeth around the end of the masonry drill bit. During the cutting process, the outer ring of the masonry bit allows it to make a large-bore hole. A core drill also plays a significant role in removing the core of bricks and blocks, which is specifically used for the transportation of electrical and plumbing cables.
Countersink Drill Bit
There is a wide, short drill bit called a carver bit intended to make a conical recess in wood or metal that will fit the head of a screw. To achieve a neater finish, the head of the screw can be flush with the material. Having this handy tool in your toolbox is useful.
Screwdriver Bits
You can use a cordless drill to use as a power screwdriver for a variety of tasks as it comes with a few different screwdriver bits. There is a possibility that your home does not already have any, in which case you could buy them at any DIY store in a set. I would recommend that if you buy a set of good quality, they will last you for many years to come.
Drill Bits for Different Materials
There are several different types of drill bits available depending on the material that you intend to drill. Let us review the three different types of drill bits that are available:
Metal drill bits
For non-ferrous metals, it would be a good idea to use drill bits with partially ground tips. Several metals can be tapped from these materials, such as aluminium, copper, brass, zinc, iron, and non-alloy steel. To drill stainless steel, drills that are made of cobalt-aluminium High-Speed Steel or drill bits that are coated with titanium are required. The cost of these drill bits is slightly more than for normal HSS drill bits, but they have the advantage of drilling complex metals without a high level of drill bit wear.
Wood drill bits
Having a long blade with two pre-cut spurs, they are suitable for drilling cleanly and effectively through wood, as they have a long centring tip and two pre-cut spurs.
Concrete drill bits
Using hammer drills or SDS drills in conjunction with these drills may be used for drilling holes through masonry and concrete. To accomplish rotary drilling, however, the wall must be made of thin, porous perforated stones. Boarded walls and porous bricks can also be used. The drill tip of a masonry drill bit should be soldered with tungsten-carbide plates if you want to drill in these kinds of materials.
Two categories of industrial drill bits exist: insert and twist. Drill bits that insert into holes are relatively inexpensive, easy to use, and do not need to be sharpened; however, insert bits often leave a burr at the outlet of the hole. Helix and spiral fluted profiles distinguish twist drill bits, which are used in general drilling applications. Some types of drill bits are used in metalworking based on CNC machining technology.
Indexable bits: insert drill bits that have ceramic inserts for the cutting edges on the inner and outer axes. In CNC manufacturing, indexable bits produce large holes quickly.
Spade drill bits: These drill bits utilize a metal body that clamps a removable bit into a precise slot, and have a twist pattern with special notches along the cutting edge that prevent long chips, for use in manual processing.
– Ejector bits: can be equipped with one or multiple cutting heads, making them suitable for drilling deep holes.
It is known that there are flat bits, dowel bits, and augur bits used in CNC woodworking machines and CNC lathes. These are the most common bits seen on a CNC mill or lathe. Getting to know more about the different kinds of drill bits available and their specifications will enable you to make an informed decision faster.
How to Choose the Correct Drill Bit Size for a Screw
For a beginner who’s just beginning to use drill bits, screwdrivers, and various tools, selecting the right size might be a little difficult. The carbide drill bits manufacturer manufactures each drill bit for a specific purpose. There are an endless number of fractional and decimal fractions used, so what is the best one to choose for your project?
It’s not difficult to pick out the right sizes since there are quite a few methods available to you.
Step 1
Locate the closest sized drill bit if you are using a screw. It is important to align them end-to-end first, to ensure that the drill bit is the same width as the screw before threads are added. As long as you do this correctly, then you will be fine.
Step 2
You have to locate the label on each of the screw and bit packages. A simple glance at any drill bit will reveal that its dimensions are labelled on the bits themselves. If you are looking for screws, a box or a bag in which they came is what you need to locate.
Step 3
For washers and other materials that occasionally require a loose screw, the opposite is recommended. Ensure the bit is the same width as the screw threads and line up the screw with the drill bit. As a result, you will be able to apply a washer so that the screw will not seal too hard against the surface.
What Should You Consider When Choosing a Drill Bit?
Various types of drills are available. You must analyze the difference between drill bits to separate one from another. The materials and coatings of drills, as well as their geometries, can vary. Consider material characteristics and tool characteristics when choosing a drill bit for CNC drilling parts.
Materials of Drill Bits
The most common drill bits are made of high-speed steel, high-speed steel with cobalt, or high-speed steel with carbide.
- The highest quality drill material is high-speed steel. It is relatively inexpensive and can be used in drill presses and hand drills. If the drill is resharpened, it can be used for longer periods.
- Then we have a high speed with cobalt. In addition to being more heat-resistant and wear-resistant than high-speed steel, cobalt high-speed blades are easier to resharpen as well.
- After that we have carbide. In addition to its high price, it can last for a very long time and has a good heat resistance and chip resistance as well as coolant holes. While carbide drills are generally more expensive than other materials, their ability to produce more holes and their 3 to 5 times faster-running speed make the cost of drilling per hole the lowest when compared to cobalt drills. Drill bits are primarily used to produce deeper holes in hard-to-drill materials.
Coatings of Drill Bits
- The bright finish is the cheapest type of coating and is usually applied when drilling low carbon steel and aluminium.
- Black oxide (oxide of titanium): more corrosion resistance than bright finish, is more resistant to oxidation and can be enhanced by applying heat treatment to it.
- Drills that are coated in TiN perform best with mild steel, those coated with TiCN work best with cast iron, and drills that are coated with TiAIN work best for high-heat applications. An inexpensive, high-quality cobalt drill with titanium, titanium-nickel, or titanium-nitride coating, can provide greater productivity in most cases, except for cutting very difficult materials.
Specification of Drill Bits
–Length: screw machines come in two lengths, the “stub” length and the “jobber” length. The rigidity of a short-length drill enables them to make finer holes than drills of a longer length on CNC machines. The shorter the bit, the more rigid it is. Two times the drill diameter in flute length above the hole is the ideal number of flutes to use to get the chips out of the hole.
However, 118° and 135° are two commonly used drill point angles. 118-degree drills are typically used on jobber length for mild steels, aluminium, and other soft metals. Hard steel and other tough materials can be drilled with the 135-degree drill with a stub length.
The angle of Helix: Helix in 30-degree is used for drilling most kinds of materials. For harder steels, aluminium alloys and tougher materials, there is also a drill with a 10-degree helix angle, which is suggested for harder steels. At the other end of the scale, drills with a 40-degree helix angle are specially designed for challenging materials.
It does not require spot drilling with cobalt and carbide since many cobalt and carbide drills have self-centring points.
Sizes of Drill Bits
To determine the right drill bit for the exact size of the hole, drill bit size charts and tap size charts are frequently used. Traditionally, drill size charts contain standard sizes in fractional, metric, wire gauge number and letter measurements, but this is not always the case.
Final Thoughts
Don’t be intimidated by the fact that choosing the right drill bit takes some practice. Consult your pilot hole chart carefully before selecting the best drill bit for your project. You should also store your drill bits in an organized way so that they are easily accessible when needed. By doing this, choosing the right drill bit size will be much easier. You must keep in mind the carbide drill bits manufacturer who has a good reputation. You can get wholesale solid carbide drill bits of good quality.
