How to sharpen a carbide drill

Sharpening core drills for metal - Metalworker's Guide

It does not require special proof that the drill during operation loses the sharpness of the cutting part, that is, simply put, it becomes dull. A dull drill isn't a problem until it's needed.

Then it suddenly turns out that it is impossible to work with a worn or dull drill. We can only regret that the geometry and size of the drill were not restored in time.

This article will tell you how to sharpen a twist drill and a hard-tipped drill bit for drilling concrete.

You don’t have to worry about sharpening a wood drill; you can work with such a drill for many months and even years without any sharpening. Unfortunately, the same cannot be said about a metal drill, which must be sharp. That is, you can drill metal only with a sharp, well-sharpened drill.

Loss of drill sharpness is characterized by a sharp creak at the beginning of drilling. A drill that is not sharpened in time generates more heat and thus wears out even faster than a sharp one.

You can sharpen a drill on special machines or using devices. Naturally, if possible, it is preferable to do this on special equipment. But in a home workshop, as a rule, there are no such machines, so you have to use a regular electric sharpening machine with a stone.

Main components of a twist drill.

So, let's look at how to sharpen a drill for metal? The type of sharpening depends on the shape that should be given to the back surface of the drill and can be single-plane, two-plane, conical, cylindrical and helical.

The drill is sharpened along the back edges. Both teeth (feathers) of the drill should be sharpened exactly the same. It's not easy to do this manually. It is also not easy to manually maintain the desired shape of the back edge and the desired back angle.

1. Single-plane drill sharpening is characterized by the fact that the back surface of the pen is made in the form of a single plane. The rear angle ranges from 28-30°.

The drill is simply attached to the circle, so that the cutting part runs parallel to the circle and sharpening is carried out without rotating or moving the drill.

With such sharpening, the cutting edges of the drill may become chipped during drilling, which is a disadvantage of this sharpening method. This is the easiest method of manual sharpening, which can be used for a thin drill with a diameter of up to 3 mm.

2. Drills with a diameter of more than 3 mm are preferably sharpened conically. It is difficult to perform such sharpening manually without skills, but it is possible. The drill is taken with the left hand by the working part as close as possible to the fence cone, and with the right hand by the tail.

The drill is pressed against the end of the grinding stone by the cutting edge and the back surface, and is slightly rocked with the right hand, creating a conical surface on the back feather edge. During sharpening, the drill does not come off the stone, hand movements are slow and smooth.

For the second pen everything is repeated in the same way.

Move the drill with its cutting edge to the grinding wheel.

We swing the drill down and then up again.

When sharpening, you should try to maintain the original shape of the factory surface of the rear part as much as possible in order to maintain the desired rear angles. If sharpening is done correctly, then it is quite sufficient for drills with a diameter of up to 10 mm. For diameters above 10 mm, this sharpening can be improved by sharpening the front surface, as shown in the photo:

Front surface point.

What is the point of a point? By reducing the rake angle and increasing the cutting edge angle, chipping resistance increases, which increases drill life. In addition, the width of the transverse edge becomes smaller. The transverse edge does not drill, but scrapes the metal in the central part of the hole. The second picture clearly shows that here it is shortened, which makes drilling easier.

For drills with a selected small clearance angle, you can further sharpen the flank. In this case, the drill rubs less in the drill hole with its back surface. See photo:

Rear surface undercut.

In production conditions, after sharpening, as a rule, finishing is done, which smoothes the surface, removing small nicks. A drill that has been fine-tuned wears out less than a simply sharpened drill. If possible, fine-tuning should be done.

For finishing, you need to use grinding round stones made of green silicon carbide (grade 63C, grit 5-6, hardness M3-SM1) on a bakelite bond, as well as wheels made of CBN LO (grit 6-8) on a bakelite bond.

Below we present to your attention an excellent selection of training videos by watching which you will definitely be able to sharpen your drills.

How to sharpen a tipped pobedite drill bit

A pobedite drill bit can also become dull. A dull drill overheats during operation, drills poorly and makes a loud squealing sound. Of course, you can change the drill by buying a new one, but it’s better to save money and sharpen it yourself.

To do this you will need a sharpening machine (electric sharpener) with a diamond stone and coolant. An ordinary emery stone is not suitable for sharpening a Pobedit drill. Before you start sharpening, make sure that it is possible in principle. To do this, measure the height of the cutting part of the drill.

When the height of the cutting part of the drill, i.e. soldering, is about 10 mm, sharpening is possible.

Don’t forget: the harder the material, the lower the sharpening speed should be. The angular speed (the number of rotations of the stone) when sharpening a pobedit drill should be reduced, regardless of which tool is used for sharpening.

It is recommended to sharpen tipped drills in the same way as simple small-diameter drills, i.e. The back surface should be sharpened flat. In this case, the back surface should be sharpened as shown in the photo, grinding the drill down to the soldering point:

Sharpened drill bit with soldering.

It is advisable to sharpen the front surface. If the soldering has already been ground down to the very drill, then it is simply impossible to do without sharpening, since the soft metal extends to the cutting edge from the front surface. The front surface is simultaneously ground down so that the thickness of the soldering center becomes smaller.

Solder point on the front surface.

When sharpening the drill, try to be precise and carefully ensure that its cutting sides are the same size. If this cannot be achieved, then the offset center of the spine will certainly result in the drill hole being enlarged and uneven.

Regardless of the device on which sharpening is performed, it is necessary to control the ratio of the front and rear angles of the cutting edge in the direction of rotation. Another rule that should be followed in order to properly sharpen a drill for concrete: the harder the material, the greater the sharpening angle.

For victory it is 170 degrees.

During the sharpening process, the drill must not be allowed to heat up, because Cracks may appear and the carbide plates may peel off. In order to prevent this, you should periodically cool the drill with liquid. You can use regular water for cooling.

We invite you to watch a selection of videos on sharpening drills with pobedite tips.

: Sharpening drill bits for hammer drills. Part 2

Source: https://ssk2121.com/zatochka-koronchatyh-sverl-po-metallu/

How to sharpen a pobedit drill bit at home? — Build Tool

» Screwdriver » Sharpening Pobedit drills

Even a victorious drill can sometimes become dull. Signs of a dull drill include overheating during operation, excessive squealing, and ineffective drilling. If it is not possible to buy new drills every time, you decide to try sharpening a Pobedit drill, then follow our advice and you will succeed.

• – a dull pobedite drill bit;
• – a sharpening machine with a diamond stone or an electric sharpener;
• - coolant.

Make sure the drill bit can be sharpened. To do this, measure the length of the cutting part of the drill; if it is more than 10 mm, then sharpening is possible.

You won’t be able to sharpen a Victory drill bit with a regular emery stone, so take a sharpening machine, preferably with a diamond sharpening stone, or a sharpener driven by an electric motor. To speed up drilling, reduce the number of revolutions per second (angular speed), since this is the basic rule of processing: the harder the material, the lower the speed should be.

Sharpen the drill with short touches to the emery stone. Constantly monitor the sharpening process, as Pobedit drills sharpen quite quickly. When sharpening the drill bit, be as precise as possible.

Make sure that the cutting sides of the drill are the same size, otherwise the offset center of the axis of rotation will lead to uneven operation and, as a result, an enlarged uneven hole. Check the correct ratio of the front and back angles of the cutting edge in the direction of rotation of the drill.

Don’t forget, the harder the material, the greater the sharpening angle should be – up to 170°. Be careful not to heat the drill bit as heat can cause the carbide inserts to crack and peel off. To prevent this from happening, cool the drill from time to time with a liquid, such as plain water.

If the tip does become very hot (turns red), do not lower it into the liquid; sudden hypothermia will cause it to immediately crack. Give it the opportunity to cool gradually, in the air.

Be prepared for the fact that you will not be able to achieve the efficiency of a new drill, since the method of sharpening a drill differs for different brands of Pobedit, and it is impossible to reproduce all the requirements at home.

If you were unable to sharpen the drill properly, just buy new drills in the store and treat them more carefully in the future. To make drills last longer, follow all the manufacturers’ recommendations, use concrete drills for working with concrete, and metal drills for metal.

Avoid overheating when working; moisten the drill with water. Don't try to drill a hole the first time. How to sharpen a pobedite drill bit

www.kakprosto.ru

How to sharpen a drill

Pobedite and ordinary material becomes dull during operation. This point is reflected in the peculiarities of the hole formation process, since each time more force has to be transmitted to form the hole. It is worth remembering that excessive wear can lead to significant defects in the drills.

An example is a situation where the formation of a hole occurred with the appearance of smoke - the result of strong friction and heating of the surface of Pobedit drills for metal. Strong heating leads to an increase in ductility, the alloy becomes less durable and hard.

That is why sharpening of metal drills should be carried out on time; the task can be completed at home.

Drill sharpening

Features of pobedit drills

Before considering how to sharpen a Pobedit drill bit for concrete, you should understand its distinctive features. The Pobedit version is a type of twist drill, the cutting part of which is represented by carbide tips.

The process of cutting the cutting edge of Pobedit drills is slower, but the cost of the tool in question is often several times higher than the cost of a conventional one. That is why you need to know how to sharpen them yourself at home.

The geometry of the cutting tool in question has the following nuances:

1. The front and back surfaces are the main elements that form the cutting edge.
2. The jumper and ribbon are auxiliary elements.

Often special equipment is used. However, it is almost impossible to find it in an ordinary workshop, as it is quite expensive and has a narrow specialization. Therefore, many people use a regular machine with a stone.

How to sharpen?

Strong creaking and heat generation indicates that the cutting tool is worn out. It is worth noting that an increase in temperature leads to an acceleration of the wear process. When considering Pobedit drills for metal, the cutting edge is made of hard alloy, you can sharpen it with your own hands only when using special equipment.

To sharpen pobedit drills with your own hands, you will need the following:

1. Grinder. Without such equipment, turning will not be possible.
2. When looking for a sharpening machine, it is worth considering that it must have a cooling bath for the stone used. You can create it yourself. The process of processing carbide involves a strong increase in temperature.
3. Diamond stone.

A distinctive feature of sharpening carbide material with your own hands is the need to use a diamond stone, since a regular one will not work.

Before sharpening, you should check the possibility of sharpening. If the soldering is less than 10 millimeters, then sharpening with your own hands is basically impossible. Also, large defects do not allow sharpening.

Drill sharpening geometry for various materials

After checking the condition of the tool and if you have the necessary equipment, you can sharpen it yourself. Its features include the following:

1. The higher the hardness of the material being processed, the lower the rotation speed of the stone should be. This is due to the fact that increasing the speed of rotation of the stone will lead to rapid heating of its surface.
2. The work needs to be done with small touches. It is worth remembering that removing the soldered alloy layer when using a diamond stone takes place quite quickly. Therefore, the master must carefully monitor the process in order not to remove an extra layer of the working surface. The work is carried out overhead, without emphasis.
3. When doing the work with your own hands, without using a template, it is recommended to sharpen the surface in the same way as in the case of small drills for metal, when the rear plane is changed.
4. It is also recommended to sharpen the front surface. It is recommended to perform this work if the soldering is completely worn out. Such a change should be made so that the thickness of the central part of the soldering is significantly smaller.

The back and front surfaces form an edge that removes metal at the time of hole formation.

When doing the work with your own hands, you need to be careful, since all cutting sides must be the same size. Achieving this is quite difficult, but still possible.

If you break this rule, the resulting hole will become large and irregular in shape.

Regardless of the type of equipment used, you should also control the ratio of the front and rear cutting angles in the direction of rotation of the tool.

A rather important rule that applies to all tools is the following statement: the greater the surface hardness, the greater the sharpening angle. In this case, it should be 170 degrees.

Particular attention is paid to overheating. Carbide brazings become very hot during processing. Overheating of any material leads to a change in its structure. Therefore, the cutting tool may become deformed and there is a possibility of cracks appearing. A stone bath will eliminate the possibility of such a situation occurring.

In conclusion, we note that the work in question can be carried out independently. To do this, you need to know the geometry of the tool, the principle of its operation and other nuances. You should also have certain skills in operating the equipment used. However, without special equipment it is almost impossible to maintain the sharpening angle.

Source: https://pgmk96.ru/ustrojstvo/kak-zatochit-v-domashnih-usloviyah-pobeditovoe-sverlo.html

How to sharpen a step drill for metal

A step drill for metal can also be called a cone drill; the tool received the first version of its name due to its appearance.

Each of its steps, formed due to a smooth spiral transition, has its own diameter, which allows you to determine during the drilling process what size the hole currently has.

At the same time, novice craftsmen have a poor idea of ​​why step drills are needed, if there are a great variety of different devices that allow you to make any hole in metal.

Many may think that buying a step drill is a waste of money, especially since the price for this category of tools is quite high.

To dispel unnecessary doubts, let’s consider what advantages a cone product has and in what cases it can be used.

Features and benefits of using cone drills

The cutting edges of the stepped device have a high strength index, which ensures a long working life.

Unlike conventional metal drills, a step tool allows you to perform a number of jobs that would otherwise require the use of a litany of other tools.

It is precisely because of this versatility that the price of step drills is too high.

The second advantage of using a drilling product is the drilling speed, at which the quality of the edge is not reduced even for thin sheet metal.

In addition to metal, using conical devices, you can work with drywall, wood, plastic and other materials.

Dense metal is also not a problem that a step drill can't handle.

Its sharp tip easily cuts into a metal product with the densest structure. In this case, there is no need to use a centering element, which simplifies the working action.

The unique design of conical products makes it possible to eliminate the use of an angle grinder and a needle file, and, if necessary, polish the finished hole.

The translational channels of the device differ in size and have a smooth transition of 35-450, which in turn increases the efficiency of drilling work with thin metal by 50%.

In addition, their design helps to enhance the cutting properties of the tool and at the same time ensures its smooth operation when processing metal.

This attachment can be used for both automated and manual devices.

The abrasive coating gives the cone product special strength.

It can be made of diamond or titanium chips, thanks to which there is no need to frequently sharpen the product under normal load conditions.

The price of cone drills for metal depends on the diameter of their working part and the type of spraying; at the moment it can range from 2 thousand to 5 thousand rubles.

The easiest way to solve the problem of “ragged” holes, which can have different configurations, is to use a step metal drill.

With the correct diameter of the tool, you can improve any unsuccessful attempt to make a hole.

In addition, a cone drill is indispensable when working with thin sheet metal, fiberglass and plastic products.

In our video you can see how to use this tool.

How to choose a step drill?

It will not be possible to make the right choice of the tool discussed above if you do not familiarize yourself with its main technical characteristics in a timely manner.

Firstly, the color of the product will play an important role in the choice, and this is not an aesthetic whim.

A steel-gray color will indicate that the steel from which the tool is made has not been properly processed. Based on this, one can doubt its quality.

The tool is made of black steel - the material was treated with hot steam, due to which the steel is hardened.

Such a processing technology will be beneficial to the master.

Golden-colored steel is a sign that the internal stress of the metal has been relieved; working with such a tool will be a pleasure.

The product for drilling metal with a bright golden hue has a wear-resistant surface layer, which uses titanium nitride. The price of such drills is higher, but they also last much longer.

Steel specifications and markings. There is no point in considering all existing types of steels from which step drills can be made, since there are many of them.

Therefore, it is recommended to choose a metal tool marked HSS - the product is designed for high-speed drilling, while preventing metal deformation when heated.

Diameter of working thresholds, starting and final. You need to decide on these parameters right away, since the average price for a tool is approximately 2,500 rubles.

Manufacturer and cost of step devices.

You don’t have to pay special attention to the first fact, since it’s better to buy a tool from a certain steel, which must meet GOST standards.

For those craftsmen who are accustomed to buying expensive and proven items, we can recommend products from the TOP CRAFT brand.

Possibility to sharpen. According to experts, a tool without the possibility of sharpening can last longer if you do not interfere, and if there is a need for sharpening, the drill will also last a long time.

In this case, the choice can be made without being guided by anyone’s advice.

How to sharpen a step drill for metal?

Step drills are available in several design options, and each model allows you to drill holes from 4 to 32 mm in diameter.

Some of them, according to the manufacturer’s recommendations, can be sharpened yourself, while some options cannot be sharpened at all.

As a rule, these are expensive but high-quality products that take about 2 years to become dull, of course, subject to normal use.

Unlike simple metal drills, step drills are not so easy to sharpen; if done incorrectly, the cutting edge may become unusable.

In general, there is nothing difficult about sharpening a cone drill with high quality.

Sometimes, to sharpen a step drill, sandpaper, which is equipped with a special rotating wheel, is enough.

In general, such drills can be processed either “by hand” or using a sharpening machine for end mills.

In this case, “on hand” it is best to update step drills for metal, which have straight flutes. But for tools with spiral grooves, sharpening on a machine is suitable.

It will definitely be possible to effectively update the characteristics of the cutting edge if the drill was originally of high quality.

More details about sharpening metal drills in the video section.

Cost and practical advice on choosing

The price of step or cone drills depends on two main factors. The first and main one is the type of material from which the drilling tool was made, the second is the working diameter.

Today, the variety of prices for step drills for metal is impressive.

For example, a titanium-coated tool with the ability to make holes from 4 to 20 mm costs an average of 440 rubles.

But the price of the same drill, but with a diameter of 4-30 mm, reaches 1100 rubles. In this case, the cost of products from a domestic manufacturer was considered.

Very often, a high price becomes the reason for the refusal of many buyers, because in this case the product may not be so ideal or it turns out that a fake was purchased.

That is why it is recommended to buy this category of products only from trusted manufacturers.

As a rule, such products are marked and a quality certificate is provided.
At the end of the article, we offer useful thematic video material for viewing.

Source: http://ooo-asteko.ru/kak-zatochit-stupenchatoe-sverlo-po-metallu/

How to sharpen a pobedit drill at home

And such a strong drill as a Pobedit one can become dull over time. This manifests itself in the form of strong heating of the element during operation, poor results and strong squealing.

You can correct the situation in 2 ways: purchase a new tool or sharpen the old one yourself. However, the material has its own characteristics that must be taken into account when performing the process. So how to sharpen a victorious drill?

What is a Victory Drill?

To drill through hard materials, drills are used, on the tips of which plates made of carbide materials are soldered. Such materials include the victor, which gave the name to the working element.

The winner is an alloy of tungsten and cobalt in a ratio of 9:1. It was first received in 1929. During its existence it was modernized more than once. But all materials obtained in one way or another also bear the name will win and differ by brand.

A distinctive feature of Pobedit drills is that they do not cut the material, but crumble it. This is why the element cannot be used for processing wood, plastic and steel. When processing the first 2 materials, the hole turns out uneven and ugly. But it is not possible to drill steel in this way. As a rule, pobedite elements are used to process materials such as concrete, brick, paving slabs, stone, etc.

Due to the peculiarity of working with a Pobedit drill, it becomes clear that no chips are formed during the process. Due to the destruction of the material, small crumbs and dust will only form. Therefore, such drills have special helical grooves through which dust is removed from the hole. As a result, processing efficiency is significantly improved.

Another feature of the pobedit tool is the ability to use different grades of material. They differ in their hardness and area of ​​use. So, to work with materials of great hardness (for example, granite), a drill with a tip made of hard pobedite (or medium) is used. For softer materials, a tip made of a medium or soft alloy is used.

When choosing a pobedit drill, you should pay attention to the manufacturer. The cheapest components are from unknown manufacturers from China. Their quality matches the price, and such drills can break the first time.

Pobedit drills from foreign companies are quite expensive. And if it is a well-known brand, then not everyone will be able to afford such a tool. The best option is a domestic product. Its quality is not inferior to foreign analogues.

Therefore, it is worth giving preference to Russian Pobedit drills.

Sharpening a Pobedite drill

If the drill is still dull, then you need to sharpen it as follows. The first step is to prepare everything you need. To do this, take a dull drill itself, an electric sharpener or a sharpening machine with a diamond stone and coolant. Once all this is prepared, you can begin to work. Initially, you need to check whether sharpening is possible. If the length of the cutting part is at least 10 mm, then such a tool can be sharpened and used in the future.

Next, take a sharpening machine or an electric sharpener. In order to carry out the process better and faster, the number of revolutions per minute must be reduced. This is due to the fact that the harder the material being processed, the lower the speed should be.

The drill must be sharpened carefully, by briefly touching it to the emery stone. At the same time, it is constantly necessary to monitor the process, since the Pobedit drill is sharpened in a fairly short time.

Particular attention should be paid to the uniformity of sharpening. The cutting sides must be the same. Otherwise, the center of the axis will shift, causing the element to malfunction. This can result in a crooked hole. Obtaining the correct ratio of the rear and front angles of the cutting edge also requires attention.

The drill should not heat up during operation. This can lead to delamination or cracking of the top carbide layers. Therefore, the tool is periodically cooled, for which coolant is used. The simplest version of such a liquid is water.

If the drill becomes very hot, do not immediately place it in cold water. A sudden change in temperature can cause it to crack. Therefore, it must cool in air.

Well, you should immediately warn that you will need to be prepared for a negative sharpening result.

Pobedit differs in its brands, each of which has its own method of sharpening. As a result, the process may not have a positive effect. In this case, the best option is to buy a new drill. However, it is worth remembering that the quality of the material is also important.

If the quality is poor, the tool will break the first time it is used. And it will be impossible to restore it. Therefore, you cannot save on purchasing this item. As you know, the miser pays twice, in this case this is fully confirmed.

Source: https://respect-kovka.com/kak-zatochit-pobeditovoe-sverlo-v-domashnih-usloviyah/

Sharpening Pobedit drills

» Screwdriver » Sharpening Pobedit drills

Even a victorious drill can sometimes become dull. Signs of a dull drill include overheating during operation, excessive squealing, and ineffective drilling. If it is not possible to buy new drills every time, you decide to try sharpening a Pobedit drill, then follow our advice and you will succeed.

• — a dull pobedit drill;
• — a sharpening machine with a diamond stone or an electric sharpener;
• - coolant.

Make sure the drill bit can be sharpened. To do this, measure the length of the cutting part of the drill; if it is more than 10 mm, then sharpening is possible.

You won’t be able to sharpen a Victory drill bit with a regular emery stone, so take a sharpening machine, preferably with a diamond sharpening stone, or a sharpener driven by an electric motor. To speed up drilling, reduce the number of revolutions per second (angular speed), since this is the basic rule of processing: the harder the material, the lower the speed should be. Sharpen the drill with short touches to the emery stone.

Constantly monitor the sharpening process, as Pobedit drills sharpen quite quickly. When sharpening the drill bit, be as precise as possible. Make sure that the cutting sides of the drill are the same size, otherwise the offset center of the axis of rotation will lead to uneven operation and, as a result, an enlarged uneven hole.

Check the correct ratio of the front and back angles of the cutting edge in the direction of rotation of the drill. Don’t forget, the harder the material, the greater the sharpening angle should be – up to 170°. Be careful not to heat the drill bit as heat can cause the carbide inserts to crack and peel off. To prevent this from happening, cool the drill from time to time with a liquid, such as plain water.

If the tip does become very hot (turns red), do not lower it into the liquid; sudden hypothermia will cause it to immediately crack. Give it the opportunity to cool gradually, in the air. Be prepared for the fact that you will not be able to achieve the efficiency of a new drill, since the method of sharpening a drill differs for different brands of Pobedit, and it is impossible to reproduce all the requirements at home.

If you were unable to sharpen the drill properly, just buy new drills in the store and treat them more carefully in the future. To make drills last longer, follow all the manufacturers' recommendations, use concrete drills for working with concrete, and metal drills for metal. Avoid overheating when working; moisten the drill with water. Don't try to drill a hole the first time. How to sharpen a pobedite drill bit

www.kakprosto.ru

How to drill through tempered glass at home?

Glass is one of the most difficult materials to drill; it is hard, but at the same time quite fragile. These characteristics make it extremely difficult to make clean holes in it, but it is quite possible. Moreover, this can be done even with the help of ordinary tools that are at hand for anyone who independently engages in construction and repair.

How to drill a hole in glass

The complexity of the work directly depends on what you use for drilling. The simplest option is to use a screwdriver or a drill with a diamond-coated tubular drill installed on it. The main requirement for the tool is the presence of a speed regulator. The entire procedure will be performed at relatively low speeds, since the higher the speed, the greater the likelihood of surface damage and cracks.

Since diamond coating, like glass, tends to overheat due to friction, we will constantly have to cool both contacting surfaces. For this we need plasticine or a plastic bottle cap.

After you have decided where the hole should be, you should place a lid filled with water directly on its center (or make a “pool” of plasticine around this place). Then you can move on to creating the hole. In this case, you should periodically pull out the tool so that water can fill the resulting void.

Having gone deeper, approximately half the thickness of the sheet, we turn it over, mark it and repeat all the same procedures, only now on the other side. To learn how to drill glass correctly, watch the video:

How to drill glass

Before modern construction tools and consumables appeared, a lot of ways were invented to make a hole in glass. The most popular is to use a regular drill, which is first heated red-hot on a burner or gas stove flame, and then hardened in wax. Then everything is done exactly as described above.

Also, to solve the problem, you can use a copper tube mounted directly in the drill chuck. In this case, it is necessary to secure pieces of cardboard with an existing hole on both sides of the glass, and it is better to place the sheet itself on a rubber base to reduce vibrations. In this case, the composition of the “coolant” also changes - corundum powder should be added to the water.

How to drill through tempered glass

There is no clear answer to the question of whether it is possible to make a hole in tempered glass. Theoretically, this is possible, however, it is very difficult to implement it with your own hands.

The problem is not only that it is usually quite thick, but also that there are a large number of defects in the sheet itself, which are visible to the naked eye. Heating makes the material harder and more brittle.

In addition, the internal stress of the sheet increases, which, as a result of external influences, simply bursts or crumbles into small pieces.

Source: https://krovli-zabori.ru/osteklenie/kak-prosverlit-zakalennoe-steklo-v-domashnih-usloviyah.html