Ordinary glass could well displace half of the expensive metals from most areas of industrial production, if not for one of its unfortunate drawbacks - fragility (in other words, extremely low impact resistance). However, in terms of hardness it is almost as good as granite, and in strength it is superior to cast iron. This set mechanical properties in a complex and leads to the complexity of its drilling. It turns out that creating a neat hole in this hard but easily cracked material is possible - but not so easy.

Leaving aside special innovative technologies and expensive diamond cutters, we will consider the most simple and cheap ways how to drill glass so that it does not crack on its own, without involving a specialist.

Note: Safety regulations strongly recommend the use of safety glasses, as even the smallest glass fragments can seriously damage your eyes.

Method No. 1: Drill with a hardened steel tip

1. Place the sheet of glass on a stable and absolutely flat surface.
2. We mark the centers of future holes (keeping in mind that the minimum distance of the hole from the edge should not be less than 12-15 mm for thin glass, and 20-25 mm for thicker glass).
3. We choose a drill (it can be either electric or manual) and a hardened drill bit.
4. We make and firmly attach a ring with a diameter of 4-5 cm and a height of 1 cm around the drilling site from putty or plasticine.
5. Pour a little vinegar or turpentine into the resulting “pool”.
6. We begin the drilling process with light pressure at low speeds (for an electric drill - no more than 300-330 rpm).
7. For thick glass, drill only half the hole, then remove the putty and carefully turn the sheet over.
8. Next, to obtain a full-fledged through hole, we repeat the process on the other side - fixing the desired center point, again pressing the ring to the glass and pouring turpentine or vinegar before drilling.
9. Choose a plastic tube with a slightly smaller diameter drilled hole, wrap it with fine-grain sandpaper and clean the inner surface.

Method No. 2: Drill with a non-hardened steel tip

Obviously, the drill tip will have to be hardened yourself. We clamp the drill with pliers and place the tip in the flame from the gas burner (or open fire, if hardening is not done indoors). After changing the color of the steel tip to white heat cool the drill - in ideal in sealing wax or, in the absence of such, in oil. The cooling process is considered complete when the sealing wax stops melting and the oil stops fizzing. We clean off the remaining carbon deposits and then carry out the sequence of operations described in method No. 1.

Video. How to make a drill from a nail

Method No. 3: Drill with carbide tip

This method is also similar to the first - but the composition of the liquid poured into the ring should be slightly different: instead of turpentine, it should be used in combination with camphor (in a ratio of 1 to 1), and instead of vinegar, aluminum alum dissolved in it in the same proportion should be used.

In addition, it is advisable to cover the surface on which the glass sheet will be placed with a cloth.

Method No. 4: If there is no drill, use wire and abrasive paste

It is quite possible that the required drill will not be at hand at all. Then it will have to be replaced with copper wire (for small-diameter holes), which will be “helped” to turn into a full-fledged drilling tool by an abrasive paste consisting of 2 parts turpentine, 1 part camphor and large emery grains. The mixture must be thoroughly mixed and filled into a container formed by a ring of plasticine or putty.

After this, the process must be repeated. 6 – 9 from the first method.

Method No. 5: If there is no drill, use a tube and abrasive paste

If the diameter of the hole is too large for the wire, it is replaced with a tube of the appropriate cross-section. Otherwise, this method copies the previous one (except that the composition of the paste can be replaced with corundum powder dissolved in water).

For glass, it is best to purchase corundum powder of the KP brand, fraction 180 microns (F80) white. This powder is sold in construction stores in the departments of materials for metalworking.

Method No. 6: If there is no drill, use a tube and a screw

This method is an even more complicated version of using a duralumin, copper or aluminum tube, from which something like a homemade drill is made.

To do this:

1. We tightly insert a 2-3 cm long wooden plug into the hollow hole of one of its ends, into which a screw sticking out about 1.5 cm is screwed.
2. We saw off the head of a securely seated screw.
3. We cut out the other end of the tube with a 3-sided file so that we get several teeth.
4. We insert the protruding part of the screw into the drill and secure it.
5. We cut out 2 cardboard washers with a cross-section according to the diameter of the hole, and glue them to the glass on both sides at the drilling site.
6. Cover the supporting surface on which the glass will lie with rubber (to create greater elasticity), and sprinkle the drilling area with abrasive powder from emery.
7. We carefully soak the teeth of the tube (playing the role of the drill head) in turpentine - after which we immediately begin drilling at low speeds until 1/4 - 1/3 of the hole is passed.
8. We turn the glass over and repeat the procedure - after which the revolution follows again (1 or 2 times until a through hole is drilled).
9. At the end we carry out cleaning using the first method.

Method number 7: In the absence of a drill and a drill

The last method (often used when it is necessary to obtain a hole of a sufficiently large diameter) does not use drilling at all. It is produced as follows:

1. The place where the hole needs to be made is thoroughly degreased (with a rag soaked in acetone, alcohol or gasoline).
2. We pour fine wet sand onto the glass surface so that the diameter of the “slide” (as high as possible) is slightly larger than the cross-section of the future hole.
3. Using a sharpened tube or stick, carefully make a vertical funnel-shaped hole in the sand up to the surface of the glass sheet (making sure that the resulting glass “bottom” is exactly equal to the diameter of the hole and does not contain a single grain of sand).
4. Melt lead or tin solder and pour it into the funnel.
5. After 2-3 minutes (when the metal has hardened), completely sweep away the sand and carefully remove the cone.

Since the glass begins to soften and melt already at a temperature of 300°C, the glass circle will “stick” to the metal and will be pulled out along with it - and the resulting hole will not even have to be processed from the inside.

Thus, even without having quality diamond glass cutters(or even the necessary drill or even the drill itself), drilling a hole of the required diameter in sheet glass is not so difficult. Although, of course, it is better to conduct preliminary training not on finished product– but on a piece of glass whose further use is not planned.

And if you have available materials, desire and a little acquired skill, anyone can drill glass so that it does not crack!

Such drills are tubular in shape and look more like a small milling cutter without teeth. The process of making round holes in glass or ceramic tiles involves the use of additional consumables for degreasing - alcohol, acetone, turpentine, gasoline, special liquids, etc. It is also necessary to take care of rapid cooling treated surface.

How to drill glass with a drill?

For high-quality drilling of glass or ceramics, the following conditions must be met:

• firmly secure the product on which work will be carried out;
• ensure that the drill fits at a perfectly right angle;
• the future hole is indicated by a small side made of plasticine;
• the drill is set to minimum possible revolutions;
• An abrasive and cooling material must be used - at best, turpentine and crushed grindstone; at worst, fine sand and water will be enough.

Since drilling glass with a drill may not work out well the first time, and there may be chips or cracks, you must first practice on small pieces. It is very important to drill slowly and with minimal pressure, otherwise the product may crack.

What is the best tubular drill bit to use for glass?

To make large enough holes in glass or ceramics, it is necessary to use special tubular drills. Similar tools are used in industrial processing. The tubular glass drill is distinguished not only by its special shape - its working cutting layer is made of industrial diamonds and is tightly attached to the steel base using the thermal sintering process.

Before first use, such equipment must be cleaned with an abrasive stone cutting edge to open the diamond layer - a similar procedure is done for special machine drills and countersinks. Diamond-coated tubular drills are best suited for such work - unlike carbide drills, they do not chip on the back side of the material being processed.

How to drill glass with a regular drill?

It is a fairly common situation in which you only need to make a few holes in the glass, and it is not profitable to purchase special equipment for this. For not large diameters You can get by with a regular metal drill. The general principles here remain exactly the same - rigid glass fastening, minimum speed, very light pressure. To drill glass with a regular drill, you need to have a good feel for the tool and flexibly adjust the pressing force - at the slightest manifestation of “beating” you need to stop the work, or it is better to change the drill to a screwdriver, which gives an even lower speed.

A plasticine limiting circle with a small amount of turpentine inside will ensure that the surface is cool and free of cracks; you will also need a good abrasive. Recommended to follow following rules when working with conventional drills:

• harden the drill before performing work - simply hold it in a hot flame, for example from a burner, and then cool it in wax;
• work as long as possible, taking breaks from time to time and additionally cooling the drill in water;
• Be sure to degrease the glass with acetone or alcohol and check for slippage before starting work;
• secure the glass to wooden surface;
• do not make holes very close to the edge of the surface (no closer than 1.5-2 cm).

With any drilling of glass and ceramics, it is possible that chips may appear on the back side. To avoid this, there are several different ways– use two pieces of glass at once, process back side plasticine, etc. One of the most simple ways lies in the fact that at the very end of the work the glass is turned over and the hole is completed from the other end.

How to choose a drill for tiles and glass?

High-quality tools for drilling tiles and glass are made by Italian companies (Zauber, etc.). According to manufacturing technology, a drill for tiles and glass can be different - steel, galvanic, brass, and so on. Best results The work is performed using tubular drills made of high-strength steel with diamond coating. For use in machines, conical countersink drills are used, also with diamond coating. To work with such a tool, no abrasive is required, and the drill provides perfect appearance holes and no possible chips or cracks.

From time to time situations arise that require the creation of holes in glass various diameters. For example, this is required when installing mirrors or when installing on glass various devices. This is very rare species work, and therefore calling a specialist can be very expensive.

You can do it yourself necessary work and do without the services of a master. However, you need to understand that glass is a rather fragile and expensive material, so you should carefully prepare before you start drilling.

Composition and production stages

The composition of ordinary glass includes quartz sand, lime and soda. Various additives greatly influence the final properties of the material, but quartz sand remains the main component, and its amount reaches 75% in the mixture. The lime component adds shine, strength, and protects against the effects of many chemicals. Baking soda can significantly lower the melting point of the mixture. The most common additional components include:

• Lead gives additional shine and ringing.
• Manganese, nickel and chromium are used to obtain various shades.
• Boric acid adds strength, shine and reduces the coefficient of thermal expansion.

Industrial glass production includes the following steps:

Currently there are many types of this material, depending on the components used in production. The most common are:

Drilling attachments and operating rules

Most often, the need for drilling arises when using industrial glass, quartz, crystal. These types are often fragile, so unskilled attempts to make holes most often end in damage to the workpiece, so the process must be approached very responsibly.

Drills for metal and concrete are not similar in shape to special glass drills. You need to work with them very carefully, and if possible, then not use them at all. But if only data is available types of drills, then it is best to use carbide concrete or spear drills for tiles. Metal drills must be hardened.

There are also special attachments, designed specifically for glass:

• Feather- or spear-shaped carbide drills of various diameters. It is highly advisable to use those that have diamond coating on the cutting part.
• A drill presented in the form of a tube. This type Glass drills can be used when you need to make a hole of large diameter. When working with this attachment, it is advisable to use a drilling machine.

When carrying out drilling work, you must adhere to the following rules:

Surface cooling can be done in several ways:

• Cover the drilling area with plasticine and fill with water.
• Place a moistened rag or a ball of cotton wool around the hole to be treated so that the water gradually flows into the recess.
• You can wet the drill itself, and a break in work will allow the drilling tool to cool down.

Ways to make a hole in glass without a drill

If you don’t have a drill and can purchase one, you can make holes using other methods or make homemade drill, but such methods do not have high accuracy and quality, as a result of which they can lead to damage to the glass surface. But still, some methods can theoretically be applied, so they should be listed.

Using sand and solder

Enough interesting way, which does not require drilling skills or tools. To use it you will need:

• Sand.
• Low-melting solder, for example, tin-lead.
• The container in which the solder will be melted.

The surface in which the hole is to be made should be degreased and dried, after which a mound of wet sand is poured onto the area in which the hole should be located. Next, you need to make a recess in it of the diameter required by the hole being created.

Solder, melted using a torch or soldering iron, is poured into the formed hole, after which you need to wait for it to completely harden. When sand and hardened solder are subsequently removed, a hole remains on the glass required diameter.

This method is different high quality and the accuracy of the resulting hole.

Making a homemade drill

If you don’t have special nozzles for working with glass, you can make them yourself.

To do this you will need a metal rod and a simple glass cutter with a diamond roller. To turn it into a drill, you need to cut a hole in the rod into which the roller is inserted and fixed so as to remain motionless relative to the rod.

The resulting workpiece is fixed in the drill chuck, and then drilling is carried out according to the principle of a conventional drill.

You can also prepare a regular drill, for example, for metal, for working with glass. To do this, you need to clamp it in a vice or pliers and hold it in the flame of a gas burner until the metal is white-hot. After this, the drill is dipped in warm water or oil. The tool thus hardened is suitable for drilling glass.

Using a metal tube

A piece of metal tube is also suitable for making a hole in the absence of a drill. To do this, cuts are made on the part of the pipe that will be used for cutting to create a cutting part in the form of teeth. When applying such work, you should use auxiliary abrasive powders or pastes, but this method quite labor-intensive and often leads to damage to the workpiece.

Using a glass cutter

An ordinary glass cutter can also replace a drill, the main thing is not to make sudden jerky movements, not to put pressure on the glass, and tap the cut surface being formed with the handle of the tool.

To cut large diameter holes with a glass cutter, you can use a compass, fixing one part of it in the center of the intended hole, and with the second part (on which the glass cutter is fixed) to cut the surface.

Often there is a need to drill glass at home. Videos of these works can be found on the Internet; they cover similar topics well. in simple language with illustrative examples.

If possible, it is better to carry out the work with a screwdriver rather than a drill. This will provide a gentler drilling experience and reduce the likelihood of damaging the glass surface. In addition, it is recommended to use safety glasses and clothing, and carry out drilling in a non-residential area.

It is important to maintain minimum clearances from the edge of the workpiece: for fragile materials - at least 25 mm, for ordinary types of glass - at least 15 mm.

It should be remembered that glass is a rather fragile and expensive material, so you need to work with it extremely carefully. If you have no experience in such work, it is important to practice on unnecessary pieces of glass in order to gain experience and understanding of the process.

Creating holes in glass may seem like a simple operation, but in practice it is a rather complex and responsible procedure. The structure of glass is malleable but at the same time very fragile. Therefore, the peculiarity of the operation lies not so much in the choice of the force of influence, but in the approach to its organization. Main task masters - not to lead to the formation of cracks, chips and breaks of the main surface. How to make a hole in glass without violating this condition? You can accomplish this task using special technologies and tricks that are available to almost any master. Next, the most popular and effective methods will be discussed.

Preparing glass for processing

Before any hole making or simple cutting operation, proper preparation should be made. The working surface of the glass must be clean and, if possible, free from defective areas - during drilling, they can cause third-party chipping, which will damage the workpiece. It is recommended to mark the lines of the future hole so that the physical flaws in the surface are located inside the circle, but do not go beyond. As an additional measure, the glass can be treated and chemicals, which, in particular, will relieve it of oil traces. If the question is how to make a small hole in glass, then you will have to prepare fixing equipment. The method of fixing the workpiece will depend on the technology for creating the hole, but in most cases such elements are mounted on a vice of a suitable configuration - damping soft material is placed directly into the contact areas.

The nuances of making holes by drilling

Glass cannot be processed using the usual drilling method. If we are talking about preparing the same small sizes, then you can use a standard set of drills and drills, but before doing this, the working equipment should be prepared in a special way. First of all, a drill of a suitable size is heated to a white tint. Next, it must be immersed in sealing wax and held until the latter melts. After this, the tip is moistened in turpentine and you can begin the work process. There is another option that allows you to do round hole in glass by drilling - it step by step instructions is presented below:

• Camphor and particles of coarse sandpaper are crushed.
• The prepared elements are poured into a small container and diluted with turpentine.
• A small section is prepared for the drill copper wire, which must be clamped in the chuck.
• The previously prepared paste is placed on the cleaned glass surface.
• To position the copper equipment, a guide jig made of plywood is prepared.
• You can start drilling.

Creating Large Holes

Drilling methods are not always theoretically acceptable for making holes in glass, and not only for reasons high risk formation of the same chips. In the case of holes with a diameter of more than 10 cm, no household equipment can cope with this task. But even in this case there is a way out, which also involves a drill. It is necessary to make a small through point in the prepared surface in the very center of the planned hole. For this, you can use any small-format glass with a diameter of less than 1 cm. You should not be afraid of third-party chips, because they will fall on the area that will already be removed. Now another question: how to make a hole in glass, having a small through opening in the center? A piece of wire is inserted into the created small hole and secured. The other end is fastened with a glass cutter. Next, after checking the reliability of the fixation of the elements and the smooth movement of the tool in a circle, you can begin cutting in a circle.

Smelting hole

IN in this case You will need to initially prepare equipment for preparing liquid tin or lead. The glass surface is also prepared accordingly. It should be treated with gasoline, acetone or alcohol. Next, moistened sand is poured onto the marked area for forming the hole. There should be enough of it so that you can create a funnel, the bottom of which will fit the edges of the hole in size. After this, metal is poured into the created funnel. It will cool down in 1-2 minutes, after which it will be possible to remove the sand equipment along with the poured mold. This best option, if there is a question regarding how to make a hole in glass without a drill and with smooth edges. But the problem may arise in another aspect. No matter how precise a sand funnel is, it will be impossible to control the diameter that will form when the glass is melted with metal.

Cutting with a soldering iron

From the point of view of the quality of the result, this option can be called the opposite of the previous one. In this case, the master will be able to relatively accurately maintain the boundaries of the marked hole diameter, but the edges may be uneven. The process begins with creating a risk using a needle file. The task of this operation is to carefully mark the future melt with a soldering iron in depth. Now you can move on to the next stage - how to make a hole in glass without drilling using a soldering iron? After warming up the tip of the device, you can start cutting. Moreover, there is no need to rush this process. It is advisable to perform melting in small sections, cooling the glass if necessary - otherwise there is a risk of deformation of areas not intended for processing.

How to make a hole in heat-resistant glass?

A very labor-intensive operation, and in such situations, limitations in methods due to the fragility of ordinary glass no longer matter. In some ways, this cutting is similar to processing metal surfaces. If we are talking about thin glass, then you can try drilling using diamond and solid-state nozzles. In any case, they cope with metal. But how to make a hole in glass of large diameter? To do this, you can use a powerful hammer drill with a crown equipped with the same diamond elements. As an alternative, you can try cutting with an abrasive wheel, but it will provide a very rough result, which is not always suitable.

High-tech processing methods

This category of methods for creating holes is more likely to be industrial, although private craftsmen also acquire appropriate equipment for their needs. We are talking about lathes and units that provide sandblasting abrasive cutting. It is water jets that give the highest quality results - how can you make a hole in glass using such equipment? First, the installation is fixed in machine clamps - there are practically no restrictions on size, including thickness. Next they refuel consumables. They are made up of sand and water. The hole is created as a result of circular cutting with a water-sand jet along a pre-designated line. The automation itself will position the cutting direction, ensuring an almost perfectly even cutting.

Conclusion

The fragility of the material significantly limits home craftsmen who need to make a hole in it. However, almost everyone traditional way The formation of round cutouts, subject to improvement, turns out to be effective in solving this problem. It is quite possible to make a hole in glass at home using a drill, glass cutter or soldering iron. Another thing is that the quality will not always meet expectations. However, manual processing always involves risks of deviation from the direction of the cut. If diameter special significance does not have, then you can turn to the smelting method - according to at least, it allows you to count on the smoothness of the edge. If you need a high-quality hole, and one made exactly, then you won’t be able to do it without special equipment.

Glass is a fragile material. Anyone who has worked with him knows how difficult it can be to cut a workpiece. Drilling glass is even more difficult - vibration and overheating of the surface increase the risk of destruction of the material. In addition, you need to have a special tool. But if there is a need to get a hole in the glass without resorting to the services of workshops, this can be done. Having studied the technology of work, everyone will be able to drill glass at home.

Preparing the material for the drilling process

Many factors are responsible for the successful completion of a glass drilling operation. One of the important ones is proper preparation places of work and workpieces. To do this:

• Remove dirt and grease from the glass using turpentine or alcohol;
• The working surface of the table where the operation will take place is covered with an elastic, dense material that prevents slipping;
• A table is selected on which the edges of the glass will not protrude beyond the boundaries of the workplace, but will touch it along the entire perimeter;
• To prevent the tool from sliding on the surface, the drilling point is pre-glued masking tape or a piece of electrical tape;
• The drilling center is marked with a marker or ballpoint pen;

If you have no experience in carrying out the work, it makes sense to practice and drill glass at home using waste. This will make it possible to feel with what force you should press on the tool, how it is more convenient to hold it in order to get a positive result and the glass does not crack.

What tools are used when drilling glass material?

There is a special tool that is designed for drilling holes in glass. His distinctive feature– the presence of a carbide working surface or abrasive based on diamond chips. Rotation of the cutting edge is ensured by the drive mechanism electric drill or a hand crank. The most common glass products on the market are:

• Spear-shaped drill with a carbide tip for producing holes with a diameter of 3 to 12 millimeters;
• Drill with diamond coating of the working part for a soft mode of drilling holes;
• Tubular drill with diamond chips sprayed around the perimeter of the tube for holes of medium and large diameter;
• Drill made of brass with diamond coating for making holes using cooling with turpentine or water;
• Tubular glass-cutting bits coated with diamond chips for drilling large diameters.

Making holes in glass using a regular drill

When you don’t have the required glass drill at hand, but need to drill a hole, you can use a regular drill for steel. You can make holes with it, you will also need to have: a drill with adjustable speed, plasticine mass, alcohol, turpentine. The work order is as follows:

• On the prepared section of the glass sheet, a side is created from a plasticine “sausage” around the drilling site;
• Turpentine is poured inside the resulting funnel, which will cool the area of ​​contact of the drill with the glass;
• The drill is fixed in the chuck of an electric drill and the engine speed is set within 250-1000 rpm;
• Concentrating on the tip of the drill, visually check the runout of the tool - it should not be large;
• Drilling is carried out by applying reasonable force to the glass surface.

Making holes in glass using sand

You can make a hole in glass even without using a drilling tool. Needed: ordinary sand, pieces of tin or lead, a small steel vessel, a gas burner. Below is everything point by point:

• The glass area is degreased and wiped dry;
• Above the point of the future hole, a “pasochka” is organized from wet sand in the form of a truncated cone;
• In the center of the cone, a cylindrical object with the required diameter is pressed into a depression to the surface of the glass;
• Tin is melted on a burner and the resulting depression is poured;
• Wait some time until the tin hardens;
• Remove sand from the surface of the glass, as well as frozen metal from the finished hole.

Making holes using a glass cutter

It is convenient to use a glass cutter as a tool for making holes in glass when the size of the latter is large diameter. Without additional device It is very difficult to describe a circle while holding a glass cutter with your hand. Therefore, a special compass has been developed, the moving part of which is the cutter itself, and the fixed part is made in the form of a suction cup, which is installed strictly in the center of the future hole. They are connected to each other by a rigid ruler.

If you don’t have such a compass, a simpler option is to use a cutter to outline a round template with the diameter of the required hole. The whole process of cutting a circle goes like this:

• Degrease the working area of ​​the glass with alcohol and wipe it dry;
• Template using double sided tape stick on glass;
• Use a glass cutter to carefully cut through the template several times;
• The template is pasted onto the opposite surface of the glass and the previous point is repeated;
• The resulting internal diameter is cut with two perpendicular lines, dividing it into four equal segments;
• Gently tapping, squeeze out the cut element.

Homemade glass drill bit

The need to drill glass may not appear so often that you need to buy a special tool for this. For one-time work, when the size of the hole does not play an important role, you can make a drill from improvised materials.

An old, worn-out glass cutter is ideal for this. In addition, you will need a metal rod whose diameter does not exceed the diameter of the diamond roller of the glass cutter.

Making a drill from a diamond roller

• The diamond roller is removed from the glass cutter and its thickness is measured using a caliper;
• The metal rod is fixed in a vice and a cut is made in the end part as thick as a diamond cutter to a depth slightly greater than its radius;
• Insert the roller into the cut and mark a point for drilling a through hole in the ears for the fastening rod;
• Take out the cutter, drill a hole with a diameter similar to the one in the roller;
• The diamond cutter is fixed in the cut with a rod, which is carefully riveted, while simultaneously squeezing the ears so that the cutter does not rotate.

• Take a metal drill of the required diameter with pliers by the shank;
• Include gas burner on the stove;
• The tip of the drill is heated with a flame;
• When the metal reaches a state where it becomes white, it is cooled in wax;

The homemade drill obtained in this way will effectively make holes.

You can certainly drill through glass without the risk of cracks and complete destruction of the material if you adhere to the following rules:

• Drilling should only be carried out using turpentine treatment of the work area;
• Do not exceed pressure on the drill during operation;
• During the drilling process, lower the working part of the drill into the coolant every five to ten seconds;
• Reduce the rocking of the instrument to a minimum during the operation;
• The center of the future hole from the edge of the glass blank should not be closer than one and a half centimeters.

Unconventional approaches to glass drilling

All non-standard methods for producing holes in glass are based on the use of homemade drills from tubes, on the working part of the end of which cutting notches are applied. But, besides this, it will not be possible to carry out such an operation without corundum powder or a special paste made from one part camphor, two parts turpentine and four parts emery powder.

The resulting abrasive is applied to the drilling site, fixing it so that it does not spread using a plasticine enclosing ring. When the tube rotates, its notches capture the abrasive, and it wipes the glass surface in the right place.