Wood Core Drill Bit–6 Tips for Selecting a Wood Core Drill Bit

Drilling a wood core

Drilling your wood core drill bit can be quite tricky, and sometimes having the right kind of drill bit will help drill you better. More so, most users often faced with the challenge of knowing the perfect wood core drill bit for their project. On that note, this article will highlight and discuss six different tips that you should look out for before choosing your wood core drill bit.

Drilling a wood core
Figure 1: Drilling a wood core

1.Choose the right Drill Bit Material.

Now, wood core drill bits vary in shapes, point lengths, and also material type. The drill bit material type ranks as a top factor when choosing your wood core drill bit. The reason for this is because different material type has the unique properties that distinguish it from others. Hitherto, most users often prefer bits with materials that will produce effective drilling. That said, there are various types of drill bit material namely;

Steel Bits: they are very suitable for cutting softwood core and are cheap. However, they are fragile and tend to break. They also become blunt quickly, which inadvertently gives them a short service life.

Titanium Coated Bits: this bit material is the strongest of them all. With the capacity to retain sharpness for extended periods, they are also very tough and can cut hardwood core easily. Their only offset is that they are pricey, costing as much as double some other materials.

High-Speed Steel: this material is an improvement from the steel bit. This steel type undergoes different treatment procedures, giving the drill bit the ability to last longer, stay harder, and retain sharpness. On a side note, they are more expensive than the steel bits.
Black Oxide Coated HSS Bits: again, this is an improvement on the HSS. The black oxide coat gives the bit a longer life span and a higher resistance to wear.

Different drills bits with different materials
Figure 2: Different drills bits with different materials

2.Core Design

Drilling through wood with a drill is a practice that spans hundreds of years. A product of that evolution today are different types of drill bit that serve different specific purposes. Most of the wood core drill bits have a pointed tip and spurs on their sides. The various types of wood core drill bits with their different applications are as follows:

Diamond Core Drill Bits: this drill bit has a pronounced spur, which makes them very accurate, easy to locate, and maintain on a single course. These features make them the best suitable when you are considering undertaking precision drilling projects.

Bi-metal Hole Drill Bits: with a saw-like point, they are the perfect drill bit for cutting wood core quickly and roughly. Their saw-like point makes them less accurate in comparison.

Taper Carbide Drill Bit: this bit is more common among professionals, as they are best suited to drill into heavy-duty wood. This bit possesses hex, of which its shank helps the drill to grip materials faster. The structural design of this bit provides it with a longer service life.

HSS Core Drill Bit: this bit is one of the most popular wood core bits, and it is a must-have. Manufacturers design this bit with treated Steel that makes it harder and more resistant to heat. These unique properties enable them to cut at high speeds without concern of overheating.

Set Crown for the wood core
Figure 3: Set Crown for the wood core

3.Drill Bit Point Coatings

Most wood core drill bits point to come in different coatings that seek to improve their cutting performance. A vital edge that some wood core drill bit has over the other is the material of the bit. More so, you must select the drill with the best coating to help achieve the optimal performance of the drill bit.

There are a few drill coating present today, some of which are;

Black Oxide Coating: this type of coating is famous among core drill bit manufacturers. Because it helps to increase chip flow making drilling smoother and faster. This coating is also suitable for reducing friction.

Titanium Nitride Coating: this coating is usually gold in color. Wood core drill bit with point coating usually drill through the core faster. This coating also increases the service life of the drill bit.

Titanium Carbon Nitride Coating: this type of coating increases the hardness of the point. It makes the drill bit cut through harder wood core composites.

4.Type of Project

Another essential factor to consider before choosing your wood core drill bit is your project type. Wood cores are a composite material, and for this reason, they contain different cellular structures for different designs. There are several factors to consider when considering the type of project.

Type of wood core: most users use either the Cedar Wood core or the Balsa Wood Core. The cedar wood core has composite skin on both sides. This wood core has its grain parallel to its laminate faces.

They also contain cedar fibers spanning the entire core, which gives the cedar wood core a very rigid frame. So if you are looking to undergo projects with this type of wood core, you should opt for drill bits with shorter but point lengths. On the other hand, the balsa wood core is a compact wood with high compressive strengths. The balsa wood can drill with simpler wood core drill bits like the spade drill bit.

Type of cut: different projects require various types of drilling. If you are aiming to achieve faster and neater drilling in softer wood cores, you can choose the auger drill bit. If, however, you are looking to drill through harder wood core faster without much regard for precision, you can opt for the spade drill bit. All these are just a few of the types of cuts you can need, the crux of the matter remains that once you know the type of cut, your project needs you can choose your drill bit.

Set of Core Drill bit
Figure 4: Set of Core Drill bit

5.Drill Bit Point Geometry

Drill Bit point is also another point to consider as different drill bit has different point lengths. These point lengths are crucial because they characterize the cutting efficiency of the drill bit. A good example is the diamond core drill bit, which has more blunt points compare to your auger drill bit. The diamond core bit is longer, thereby permitting more open channels for the coolant to reach the cutting area in the hole.

Other criteria, such as the wood puckering, chip breaking properties, are all a function of the drill bit point geometry. If you are looking to cut deeper holes, you should also opt for point lengths with better torque properties.

Core Point for a bit
Figure 5: Core Point for a bit


Wood core drill bits are of different types and different qualities. You must understand that you must evaluate the cost efficiency of your drill bit. Choosing the perfect drill bit will entail both cost and performance efficiency.

Drill bit cost is quite important with drill bits of expensive composition like the diamond core costing far more than the normal bi-metal drill bits. Due to this significant price difference, you must choose the drill bit that economically justifies its performance. Occasionally, this performance justification is accomplished by only staying in the hole longer. In such cases, the benefits of using it are intangible.


The wood core drill bit is a cutting tool that is popular among professional, skilled users and unskilled users also. The wood core comprises a composite material that can be quite difficult to cut. This article provides you with different tips on how to choose your wood core drill bit.

So, as you continue to look out for a better understanding of how to choose the best diamond drill bit for your project, look no further, NCCuttingtools has got you covered.

wood core bit–8 tips for using wood core bit for wood

Close-up image of wood core bits

A wood core bit is generally a form of the conventional drill bit. However, the significant difference lies in the waste product given off after cutting. It is similar to a hole saw but removes a core- a solid cylindrical piece gotten from the cut. Whereas, other forms of drill bit give off dust.

We have put together this article to provide insights on best practices when using a wood core bit. By the end of this read, you would have gotten few tricks up your sleeve on handling core bits.

Close-up image of wood core bits
Fig. 1: Close-up image of wood core bits.

1.Keeping the bits sharp

While some wood core bits are self-sharpening, others require sharpening from time to time. You also need to bear in mind that “one sharp tool is better off than many blunt tools.” When your core bit needs sharpening, it seizes to perform as expected. You might want to conclude it’s a mechanical issue when your bit becomes dull, but it just needs sharpening.

To determine if your core bit is blunt, you would observe that the teeth are slightly rounded and difficult to cut. In extreme cases, the wood rips. Another act that can quickly dull your core bit or even break it is when you place too much pressure on the drill machine in a bid to quicken the drilling process.

If you finally decide to sharpen your wood core bit, you have the option of doing it yourself or sourcing the expertise of professionals. Should in case you choose to do it yourself then you can get it done using a fine triangular file. If you can bear the cost, then a universal sharpener is the way to go! You should start by using a permanent marker to mark your starting point to avoid a double revolution.

It is worthy of note that the triangular file is manual while the universal machine is automated.

Image showing the sharpened teeth of the core bit
Fig. 2: Image showing the sharpened teeth of the core bit.

2.Mind your speed and torque

The quest for the right RPM drilling wood can be quite tasking. High RPM might likely burn your wood. If you drill too slow, you might still ruin the job. For cases where the hole won’t be visible at all, a slow drill could still be allowed. For the record, finding the right speed is mostly dependent on your level of experience. The type of wood in question also plays a great part in deciding the speed to apply.

Following best practices, we recommend that you start slow and carefully increase your speed. It is no gainsaying that softwood will allow for a reasonably high speed compared to hardwood. It is obviously due to the ease of getting through the wood.

Maintaining a slow speed at first will help your core bit tip last longer and prevent damage to your wood. In a case where you have to bore through a wood completely, you should slow down your speed upon arriving close to the exit.
In general, high speed fits wood drilling. Most hand power drills have an adjustable speed via a knob that you can work with to achieve your aim.

Hand power drill in operation with the core bit
Fig. 3: Hand power drill in operation with the core bit.

3.Stop Intermittently between drills.

While drilling, especially thick/hardwoods, the core bit would need rest at the interval. “This is also called the stop and cool technique ” -the purpose of resting is to avoid overheating of the core bit. When the core bit becomes very hot, it gets blunt faster and requiring you to spend more time or money to sharpen it frequently. You should keep a bowl of cold water close-by whenever you can intermittently dip in your core bit for a few seconds to cool it off. Stopping intermittently also eliminates the chances of burning your wood. This act also affects the overall life of the core bit.

In a situation where you are drilling a hole all through the wood, endeavor to do it in steps. Failure to do it in steps could leave the back of the wood looking rough and jagged. You would do yourself good by adhering to this factor to have a fine and smooth final cut.

Picture showing a core cut out of wood
Fig. 4: Picture showing a core cut out of wood.

4.Create an Indents before commencing

The need for an initial indent is pivotal to making a pilot hole. A center punch and hammer creates an indent at the desired center point to commence drilling. With an indent in place, you should never go wrong. This indent guides your entire drilling process; without it, great mistakes abound. The pilot hole is smaller in diameter than the required hole size, but it is important to create one initially.

With an indent and pilot hole, your job is of high precision and accuracy.

Picture showing center drill for creating a pilot hole
Fig.5: Picture showing center drill for creating a pilot hole.

5.Avoid Tear-outs

When drilling, you would want to avoid a tear-out because it makes you feel less of a pro. Taping and the use of a sacrificial/ scrap board can save the day in situations such as this. Marking an X- shape with painter’s tape helps to prevent chipping or cracks in surrounding areas where drilling starts. Slowly progressing your core bit into the wood also eliminates the chances of a tear-out. In other cases, not properly securing your workpiece in place can lead to the tear-out of large chips.

The sacrificial board is, on the other hand, fastened to the back of the workpiece to support it from behind. In all, if you desire to avoid a tear-out watch out for your drill’s exit speed.

6.Clean the bit after use

For every tool or device, it is an established practice to always clean after use to ensure longevity and durability. Below are a few steps to be taken in cleaning your core bit after each job:

Step 1

Dust off debris from the wood and your workpiece to avoid possible scratch every five to ten minutes when drilling.

Step 2

Once your wood core bit cools off after an intense job. Get a clean, dry towel to wipe the outer and inner parts of the bit from top to bottom. You can hand-spin the core bit while the towel still wrapped around.

Step 3

For the teeth, use a clean brush to remove any stuck wood material.

Step 4

After carrying out steps 1-3, faintly apply a coat of machine oil around the core bits. If you have a handy case return them there. If otherwise, keep in a cool and dry place free of any natural elements that could deplete its quality.

Having satisfied all the procedures as mentioned earlier, be assured you got a durable and long-lasting core bit.

7.Have two sets of core bits

It is ultimately an optional tip in a bid to maintain accuracy. Most professionals trust a new set of core bit to start a hole. Then they switch to an older set to complete the task.

The reason for this is not far-fetched at all. This approach keeps your new bits sharper for a long time, thereby saving you from frequent sharpening to achieve a good cut.

Picture showing sets of core bits in a handy case
Fig. 6: Picture showing sets of core bits in a handy case.

8.Observe all safety measures.

Keeping safe at all times is a must. You should not take it as a joke or trivial matter. Below are few precautionary measures to follow to ensure a safe working environment and condition both for yourself and drill:

Keep hands straight

Drilling is not all that difficult, but the slightest offset in the position of the core bit can ruin your job. It happens when you use a hand power drill. The indent and pilot hole, as well as another board placed on top of the workpiece, helps maintain squareness. If you own a drill press machine, you need not bother as the default configuration is perpendicular.

Do not realign once you start drilling

If, for any reason, you drift off the hole as you drill, do not attempt to exert pressure. Do not correct your mistake as by forcing your drill to one side as further mechanical complications could arise. These complications could lead to the breaking of your core bit and even the dulling of the teeth.

Store and keep bits in carrying case when not in use

Always keep away from heat, moisture, etc. when not in use. It gives your core bit a lustrous feel and appearance at all times.

Secure the workpiece in a clamp, vice or any fence

Regardless of whether you are using a drill press or hand power drill, you need to secure your workpiece properly. This singular act could reduce the rate of hazard by up to 50%.


Having digested this article, we believe you would have learned vital tips to help efficiently use wood core bits.NCCuttingtools is always ready to respond at the snap of your finger to render any help you need. In situations where you fall into distress or dilemma and need professional advice as regards all range of cutting tools.

Ring saw-5 Tips For Choosing A Ring Saw

Concrete sawing

One of the most underestimated tools in a toolbox is the ring saw. It comes as a shock to me because, in all of my experience researching expert cutting tools, the ring saws prove to be one of the most effective and versatile cutting tools. They are very handy and cut through almost any material.

Also, a lot of handymen find picking a ring saw quite challenging. Well, if you fall into that group, I’ll be revealing all the secret tips to picking the best ring saws to you in this write-up. Now let’s begin!

What Is A Ring Saw?

A ring saw is a handheld cutting tool, effective in cutting areas that are inaccessible or unreachable to bigger road saws. It is a variation of the band saw with a rigid band. The ring saw blades unlike normal saw blades are abrasive and not toothed. This abrasive coating allows them to be more stable while making precise cuts.

They are very strong and can cut through hard materials like stone, marble, glass, granite, in addition to being very popular in the concrete sawing industry. Construction workers commonly use ring saws to create openings and insert windows and door frames amidst other amazing uses.

Concrete sawing
(Concrete sawing)

Benefits Of A Ring Saw

Where are you wondering about the other amazing uses? Welcome to this section! Here are some of the astounding benefits of a ring saw;

  • Portable and practical: The ring saw is handheld and can fit into your space easily. It is not heavy and is easy to use.
  • Versatile: One can easily detach the saw from its base, which makes it the best for any type of application. The cutting surface is big enough to work on large pieces, and you can also detach it from this space while working on small pieces.
  • Powerful and safe to use: A ring saw, especially those with a diamond blade ring, can create cuts twice as deep as that of a standard saw.
  • No vibration: The ring saw operates by spinning rather than vibrating. It is good news for those who dislike noise in their workspace.

Now that you’ve learned the basic ring saw facts, it’s time to get into the hidden secrets of picking the right saw.

Tips For Selecting A Ring Saw

1.Know your blades

Blades are undoubtedly the most important part of a saw. A ring saws is only highly effective if the blade measures up to standard. You do not pick a saw unless you understand the basic concepts that govern the blade and how the blade works. That’ll be a total waste.

Ring saws blade must have the following characteristics to produce maximum quality; hardness, toughness, and wear resistance. No blade beats the diamond ring saw blades in emboldening all these properties. Diamond blades are the absolute best for ring saws. Diamond is the hardest material, and this blade is made by having small diamonds fixed to its edges. It explains why they are so effective in cutting hard and abrasive materials. Picking diamond ring saw blades for your projects will be the best choice you’ll make for any operation. They are not just really strong. They also help make the most precise and clean cuts with the ring saw.

Diamond blade rings are not just of good quality. They are also a general-purpose blade. They can cut through hard materials and are also really suited for extensive and frequently repeated jobs. It is also of utmost importance to pick a blade ring that matches your ring saws size. Do not pick a blade that exceeds the maximum blade diameter of your ring saw.

Video link on how to choose the right diamond blades

2.The most suitable material for a ring saw

The material you’re working on has a huge role to play in picking a ring saws. Although this doesn’t pose much of a challenge because ring saws are versatile.

Understanding the matrix of your saw will prevent wears and help it last longer. There’s a general rule to this: A diamond ring saws blade that cuts soft material should have a hard metal bond to prevent the diamonds from shedding away. While a ring saws blade cutting hard material should have a soft bond.

It is also important to know every detail about the material you are cutting. If you’re dealing with concrete, for example, you need to know the compressive strength, size, and hardness of the aggregate. Your ring saw blade should match the material you use.

3.How to choose a ring saw with high durability

Ring saws are one of the strongest and durable saws you can find. Asides being highly versatile and having the ability to cut through a wide variety of materials. It has a silent and easy operating mechanism that makes it long-lasting. As said earlier, the saw operates by spinning rather than vibrating, which makes it less prone to wears.

The ring saws blade determine the durability and long-lasting nature of the saw. You have to pick a ring saw blade that is in sync with your workload. If you’re dealing with a high volume of cuts, check every detail of the blade. Are the cutting edges made of high-quality diamonds? If yes, the ring saw has a high chance of being strong.

The best way to be sure that you’re getting a premium high-quality ring saws is by buying from a reliable brand. Different brands have varying designs, and some might not be authentic. In order to get a strong and reliable ring saws, it is important to buy from the best. At NC cutting tools, we offer high-quality ring saws. Custom made just for you.

Diamond saw blades
(Diamond saw blades)

4.Select a ring saw with the highest cost performance

Cost per performance is one of the most critical points to consider before buying a ring saws. How much are you willing to pay? OR How high standard is your project? The basic determinant of the cost of a diamond ring saws blade is the amount of diamonds manufacturers weld into it. Diamonds are the most crucial raw material in manufacturing this tool. The number of diamonds determines how hard and strong a blade is. A ring saw with a higher diamond content will boost productivity and last longer.

Before buying a diamond ring saws, you need to decide what’s higher in your production spectrum. The initial cost or the total sawing cost? If you’re a beginner working on smaller operations, a ring saws with a lower cost will be more economical. A high-quality diamond ring saws are best suited for large projects and frequent use. Although they’re more expensive initially, they pay in the long run on a cost per cut breakdown. Always choose a ring saw with the highest cost performance. It’ll save you a lot of stress in trouble.

The good news is that you need not worry much about performance with NC cutting tools. We produce ring saws custom made to your specifications. We offer the best value for your price.

Different sizes of diamond discs
(Different sizes of diamond discs)

5.Wet or dry cutting

One of the most important factors to consider before choosing a ring saw with diamond blade rings is the cutting method. Whether to use wet or dry cutting depends on the type of operation you’re carrying out.

Wet cutting is faster. You also do not have to worry about dust because the water cools the blade. Wet cutting is best for masonry, concrete sawing, and floor sawing. These projects require the blade to cut hard material and would need cooling from time to time. The major disadvantage of this method is that it tends to leave your workplace wet and messy.

Dry cutting, on the other hand, is suitable for indoor jobs to keep the work area dry and clean. They are the best choice for handheld saws and make clean crisp cuts. They require higher quality diamonds and use the air from the spinning blade to cool off. Although, this method won’t be so effective in cutting very hard materials like granite. The decision you make depends on your preference and work requirements.

Wet cutting method
(Wet cutting method)

Final thought

The ring saws comes in very handy and will save you a lot of work headaches. Always make sure to follow the necessary safety precautions to prevent injury while cutting. Contact us at NCCutting tools for more information on buying your own specially customized ring saws.

6 Common Grinding and Polishing Mistakes You Could be Making

Grinding Concrete Floor

Grinding and polishing play an essential role in surface preparation today. It has become so crucial that the tendency to obtain quality surfaces traces back to the method carrying out grinding and polishing activities. Even with the popularity of these activities, it is not strange to find end-users making tremendous mistakes while grinding and polishing. These mistakes affect not only the appearance of the surface but also the quality of diamond tools. This article focuses on 6 of the most common grinding and polishing mistakes you are prone to make, and how to avoid them. They are listed and explained below:

Figure 1 Grinding Concrete Floor
Grinding Concrete Floor

1.Improper Selection of bond for concrete you are working with

Diamonds work uniquely during cutting and set in a unique matrix. The concrete dust produced in the grinding procedure interacts with this matrix and wears it down. Hence, the matrix exposes more diamonds as you grind.

Now that you understand how metal bond diamond tooling works, It is important to select the right tooling for your job. Usually, you will notice small amounts of fine dust when grinding hard concrete. However, when grinding soft concrete, large specks of dust is always noticed. As a rule of thumb, it is best to use hard bond diamonds for soft concrete and soft bond diamonds for hard concrete.

One of the most common mistakes that operators make is selecting the wrong bond for different concrete hardness. When you do this, two things will happen:

1)You will notice a tremendous amount of heat and glazing. Overall, when you try to run the machine, the diamonds will not cut.

2)If you are fortunate enough to have their diamonds cut, then you will experience a bigger problem. Initially, the diamonds will cut very fast and quite well, but it will not last. It will wear out very quickly.

Both outcomes are not desirable because they waste time and money. Besides, the physical appearance of the workpiece will be terrible.

2.Running the grinder too fast

It is not strange to find operators under immense pressure because they need to complete a grinding operation quickly. Consequently, they tend to run the grinder at extremely fast speeds with the hopes of achieving a faster production rate.
Running the grinder at extreme speed will cause overheating, thereby glazing over your diamond tools. This occurrence is particularly common when working on hard concrete. In the long run, it reduces the cutting efficiency of the diamond tools. Many brands of grinders or polishers run at a maximum drum speed of 1200 rpm with the dial set at full power. A rule of thumb is to run your grinder at a drum speed of 600 rpm.

Figure 2 Worker running the grinding machine at moderate speed
Worker running the grinding machine at moderate speed

3.Purchasing inferior quality diamonds at a lower price

Most operators or end-users prefer to purchase diamond tools at a very low price. This act is a very big mistake to make for diamond tools. You may argue that price does not necessarily determine quality; however, this is a misconception when it comes to diamond tools.

When you purchase inferior tools at a lower price, they tend to wear faster, perform poorly, and even scratch floors. In the end, you will have to replace this tool with a new one, and your overall cost will be higher. A piece of good advice is that you should always purchase diamond tools from trusted suppliers.

Figure 3 Excellent finish after polishing marble floor
Excellent finish after polishing marble floor

4.Failure to inspect the floor

The metal bond diamond is very effective in grinding and polishing a variety of materials such as steel and brass, as long as the material is not “above grade.” This condition means you must not raise the material above the floor surface. And to ensure that you satisfy this condition, you must carry out a proper inspection of the floor.

If indeed there exists anything above the floor surface, you should either grind, cut off, or smack it to knock it below grade. Once you have done this, you may proceed to grind this material along with the concrete.

As straightforward as this task is, many experts and technicians fail to inspect the floor before grinding. The consequence of this can be catastrophic. Usually, it knocks your diamond segment off, which can damage your machine.

5.Failure to understand the process required for the desired outcome

Before deciding on what your starting diamond will be, you must ask yourself some questions. Firstly, you must know what type of finish you are trying to achieve. For instance, you may be trying to achieve a heavy aggregate exposure, cream polish, or salt & pepper finish. If you plan on doing a cream polish, then you must resist the urge to start with a metal bond diamond. The reason for this is because they tend to remove the cream forever.

You must also decide if you will have to remove some things on the floor before polishing. For instance, you might have to remove epoxy coatings before polishing. If you decide to remove epoxy flooring before polishing, then you must resist the urge to use aggressive diamonds. The reason for this is because aggressive diamonds will make deep scratches, which will be extremely difficult to remove.

It is not strange to find operators unsure of the diamond to start with during polishing. As a rule of thumb, you should start with a less aggressive diamond. In doing so, you are on the side of caution because you can always change to a more aggressive diamond.

Figure 4 Grinding concrete surface
Grinding concrete surface

6.Neglecting stubborn scratches

A common mistake made by a lot of people while polishing floors is the failure to keep an eye on the finish. It is not strange to find scratches appearing on surfaces while working; what matters the most is how fast you respond to these scratches.
As a rule of thumb, you must remove scratches immediately you notice them. If you think the problem will cure itself, then you have just made a big mistake. It will only continue to manifest as you polish the floor. You must not switch to a more aggressive diamond when you start to see scratches.

Figure 5 Workers seen polishing concrete floor
Workers seen polishing concrete floor


You are doing yourself a great deal when you avoid these six common mistakes, especially when you purchase equipment from trusted suppliers. NCCuttingtools is a place to get diamond tooling, grinding wheels, and other essential equipment for your grinding and polishing operations. They also have experienced personnel to guide through your challenges. You should also check this video for insight on how to grind and polish concrete.


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