Ballerina on wood. We can handle any diameter! Ballerina circular drill for wood Drill for cutting circles for wood

Drills are intended for drilling holes in wood materials and wood using woodworking tools. To their main technical specifications include: type and geometry, material and heat treatment, workmanship and accuracy.

Characteristics of metal for drill

The drilling process is the mechanical and physical impact of the drill, therefore the raw material from which it is made must have properties such as:

For woodworking

In a home workshop, when working with wood material, you may need a tool for cutting round holes. These tools include a drill, which in everyday life craftsmen who work with wood or wood-based materials call a ballerina. The exact name of this device is a circular drill.

Tool design It is a bracket, along the axis of rotation of which the drill is fixed. It marks the center of the hole and provides rotational support for the entire fixture. At the edges of the bracket there are two carriages in which the cutters are fixed. The bracket rod is marked, so the carriage with cutters can be installed with high precision. Before starting work, the lateral incisors are moved apart to the required distance. They are pressed to the bracket with screws.

There are other modifications of the woodworking ballerina with one, two or three cutters. The bracket can be replaced with a disk, in special slots of which cutters are placed to adjust the diameter. A hole can be drilled straight or at an angle in the axis into which a cutter is inserted, adjusted with a locking screw. It provides the size of the diameter of the resulting circle.

The tail of the axis can be round or specially shaped for fixation in the SDS chuck. To remove a straight or rounded chamfer, where necessary, use various shapes knives.

In addition to wood, material with which this device works, maybe drywall, plastic, rubber, tile, metal.

Drilling drywall

For installation various equipment in plasterboard with a diameter of up to 100 mm, a ballerina is designed for plasterboard. It is a leg with a centering tip, above which there is a mount for the rod, rotating around its axis. In order to hold the tool, at the end of the central post there is a handle with a notch along the side surface. At the other end of the rod there is a disk cutter.

The device works as follows:

• a tool is drilled in the center of the proposed hole;
• the rod is set at the distance of the required radius;
• The specified hole is cut using circular movements, the edges of which do not require finishing.

The advantage of a ballerina drill for drywall, in comparison with other tools for the same work, is that:

• the device quickly cuts a hole;
• the disk cutter does not require sharpening;
• despite the intensity of work, all devices do not become loose;
• The rod mount prevents the cutter from moving randomly, changing the cutting geometry.

Tile tool

During construction or repair work It may be necessary to make a hole round shape in the tiles. This is necessary for installing a socket, switch, or output through a wall. plumbing pipes or other elements.

To work with tiles, single-cut, double-cut and three-cut annular drills are actively used.

The use of these devices contributes ideally smooth cut tiles without chipped enamel. By arranging and fixing the cutters at the required distance, you will get a hole of the required diameter and size. Using a circular drill will significantly save time and reduce labor costs. The operation of the instrument is similar to how a ballerina dances.

Drilling process steps:

Carbon steel is used to make the device. It is an alloy of carbon and iron. The amount of carbon determines the strength of the tool and its ability to resist load. For greater wear resistance, less sensitivity to overheating and deformation, some manufacturers add chromium, silicon, tungsten, vanadium, and molybdenum to the alloy. For example, the P6M5 marking indicates that the steel from which the cutter or drill can be made contains 6% tungsten, 5% molybdenum, this increases strength.

For strength and increased service life, the drill tip can be tipped with carbide. Such devices give a cutting depth of 30 mm, and without soldering - 25 mm.

Comfortable operating speeds for the tool will be from 1000 rpm to 1400 rpm.

The ballerina, depending on the functional accessory, makes holes whose radius ranges from 20 to 150 mm, while the diameter of the cut circle will be 2 times larger. For example, using a tabletop drilling machine or drill, a ballerina for metal allows you to cut or drill holes in metal with a radius from 22 to 105 mm. The thickness of the material being processed should be up to 14 mm. The material can be steel, cast iron, brass, bronze, aluminum.

DIY making

When there is no device at hand that can cut a circle from wood material or another, you can try to make it yourself. To do this, you will need a collet holder and a set of the required size of feather drills. A collet holder is a clamping mechanism that is used to clamp a rotating cutting tool. It can be made from a bolt, the diameter of which depends on the chuck of the rotator, machine tool or drill. The head of the bolt needs to be cut off and sawed crosswise along the thread side.

The center drill is sharpened into a cone, and the cutting drill into a wedge. In this case, the end of the center drill should be 3-5 mm longer.

The drill is held by two nuts: one is a clamping nut, the other is a guide. If holes with a constant radius are cut, then the drill can be welded to the holder.

Disadvantages of the device

In addition to the benefits, when working with circular drills there are some disadvantages. These include:

• thread breakage of the clamping screw;
• vibration when using a single-cut tool;
• cutter wear;
• difficulty of working with a three-cut device;
• intermittent operation to avoid overheating of the nozzle;
• frequent breakage of a cutter or drill, including during operation;
• breakage of the material during the drilling process.

To work with a circular drill, you need good tool, quality material, work skills.

Safety precautions

When working with the device, you need to remember your safety:

Craftsmen who process wood and wood-based materials (plywood, chipboard, etc.) use a whole range of different tools, depending on the type of work performed. If necessary, do this in wood board round hole a wood drill is used. In this case, the hole size is limited by the diameter of the drill. To create round openings big size A drill of a special design has been developed - a ballerina for wood.

Ballerina on wood - what is it?

Ballerina – adjustable circular drill. The design of the tool includes movable cutters, which allows you to adjust the diameter of the cut hole. Advantages:

• simplicity and reliability of design;
• high-quality edge processing;
• adjustable drilling diameter (d up to 30 cm);
• budget price.

Suitable for wood, drywall, plastic.

Design and principle of operation of the ballerina drill

The design of the tool is simple and reliable. It includes:

• Bracket. A centering drill, a crossbar, and an end cap for fixing in a drill or brace are attached to it.
• Centering twist drill. Marks the center of the circle for cutting, provides support for cutting elements.
• Crossbar. Support for moving cutting elements. It is graduated to set the diameter of the recess.
• Sliding cutters. By moving them along the divisions on the rod, the required hole size is set.

Making a ballerina on wood and tiles

The main feature of this tool is the ability to adjust the diameter of the hole being drilled. The minimum size is set by the size of the bracket, the maximum by the length of the crossbar.

The cutters are attached to the crossbar with hex screws. Some ballerina drill models use clamps for a Phillips screwdriver, but they are inferior in terms of convenience and reliability of fixation. Before starting work, the cutters are installed in the desired position, at an equal distance from the center, using markings on the rod or measurements with a caliper. After installation, the cutters are securely fixed in a strictly vertical position.

To start work, a centering drill drills in the center of the future opening, fixing the tool. The cutting elements are installed under right size. They slide apart along the guide rod and are securely fastened. Using a drill or a brace, the ballerina begins to rotate, and the incisors moving around the circumference cut a recess along the contour of the future recess. The drilling speed depends on the material being processed and the rotation speed.

Using a ballerina drill

Technical capabilities and types of ballerina drill

The spread of the cutters, which determines the drilling diameter, depends on the model of the wood ballerina. Manufacturers offer tools with the following expansion ranges (in mm):

• min 30, max 120;
• min 40, max 200;
• min 40, max 300;
• min 40, max

Reliable instrument manufacturers use only high-strength steel or alloys to make wood ballerinas. This allows the drill to be used for processing both soft and hard wood-based materials.

The drill has a limit on the thickness of the part - 15-20 mm. Attempting to drill through a larger thickness will result in poor quality finishing of the edges of the recess. Limitations are related to the length of the incisors. The maximum permissible drilling depth is indicated on the original packaging of the tool.

The ability to securely fix the tool allows you to use the ballerina drill in limited space - for example, inside assembled furniture, as well as on curved surfaces. Drilling surfaces with decorative coating– laminated or veneered.

The possibilities for using wood drills are expanded due to modifications with one, two and three cutters:

• Single-cut. The cutter is fixed with a screw on a special bracket. The asymmetry of the design causes strong beating of the instrument.
• Two-incisor. Classic model.
• Three-incisor. The cutters are mounted on a round disk and move along special slots. The scale is applied. The work of the cutters is synchronized.

Application of cutting edges different shapes also expands the types of processing - removing a rounded or straight chamfer, etc.

Criteria for choosing a ballerina

There are several important parameters that you should pay attention to when purchasing a ballerina:

• Company manufacturer. The brands Stayer, Strum, Topfix, Irwin enjoy a good reputation.
• Number of incisors. Experienced craftsmen Two- and three-cutting models are recommended due to the combination of convenience and High Quality work.
• Quality of cutters. Cutting elements made of hardened tool steel with carbide surfacing serve for a long time and with high quality.
• Metal quality. High-strength steel or alloys with anti-corrosion coating guarantee a long service life without breakdowns.
• Workmanship. The high-quality design is characterized by the absence of backlashes and distortions. The parts are adjusted and securely fixed.
• Possibility of replacing parts. In cheap models, the shank, drill and rod may be one-piece.
• Method of marking. On quality instrument The scale is stamped; sometimes bright paint is additionally used.

When choosing cheap models of ballerinas made of wood, you should be prepared for rapid wear, since soft metal without anti-corrosion coating not able to withstand heavy loads. Poor quality cutting edges quickly lose their sharpness. Moreover, cheap models can be dangerous due to unreliable latches. Rapid rotation can loosen the cutter mount, causing the cutter to fly out of the structure at high speed.

Besides the ballerina, there are other tools used for the same types of work. Their names and brief characteristics are given in the table:

Drill type	Design	Peculiarities	Drilling parameters (cm)
Forstner cutter	Consists of a sharp centering pin and two cutting edges - selecting and scoring	Used for blind holes with high quality processing	Depth up to 30 Diameter up to 6
Feather	The working flat part is made in the form of a feather with a spear-shaped tip	Poor quality of edge processing	Depth up to 15 Diameter up to 6
Screw (spiral)	Cylindrical spiral with a pointed end	The most common. High quality processing.	Depth up to 60 Diameter up to 6
Hole saw or circular saw (wood saw)	Consists of a central pilot drill with a cylindrical cutting edge around it.	Fixed diameter. Good quality. It is rational to use when it is necessary to create a large number of identical holes	Diameter up to 13

A special ballerina drill has an obvious advantage over other tools when it is necessary to drill a large number of different-sized openings. It is also suitable for use in confined spaces and on uneven surfaces where it is difficult to control the tilt of the tool.

Wood and wood-based materials can be easily processed with tools with cutting edges. To work with them, an extensive set of tools is offered for various types processing. A woodworker will definitely be faced with the need to drill large holes. The optimal solution problems will arise when using an adjustable circular ballerina drill - thanks to the combination budget price and high quality work.

Wood is almost always easy to process with various tools that have a cutting edge. Quite often woodworkers have to drill chipboard material or fiberboard using various drills to make furniture or wood crafts during construction work.

Often you have to make holes large sizes, for example, in wooden house construction or for fastening parts. The holes can be through and blind, and for making holes large diameters you will need a special drill called a ballerina. What kind of drill is this, what does it look like and what technical capabilities does it have?

Ballerina on wood

To work in a home workshop, you can get by with ordinary drills on wood and metal, but to perform special complex operations, a specialist cannot limit himself to a minimum set of tools.

Having a good electric drill, you can make a hole in wood with a diameter of no more than 2 cm using a metal drill. For hard wood or loose materials it is necessary select special tools, which are designed for each specific case.

When craftsmen need to drill a large hole, a drill with the unusual name ballerina comes to the rescue. This is a common name, very common among woodworkers.

With a tool like this you can make holes with a diameter of up to 300 mm in materials such as:

• Tree.
• Plywood.
• Plastic.
• Drywall.
• Tile.

Ballerina consists of two incisors and a centering drill, with the help of which the circle is cut. The cutters are shifted along the guide and set required diameter circle for cutting. To rotate the ballerina, you need to use a drill or a rotator with low speed, so the tools can be rotated manually.

A round drill with cutters can be adjusted to the desired diameter; the design also includes centering drill, they can be used to perform preliminary drilling in the surface of the material and fix the product.

Moving cutters with a sharp tip are designed for direct cutting of material; there is also a bracket on which moving elements are secured.

The ballerina may have different quantities incisors, from one to three, it all depends on the shape of the device and the price of the special drill.

The working principle of the ballerina is simple, first the central twist drill makes pre-drilling into material, and sharp sliding cutters cut a groove around the circumference of the surface of the material. They are spread to the same width from the center and then fixed with a special key.

How and with what to drill wood

To drill small holes with a diameter of 10–12 mm, ordinary metal drills are most often used. If every millimeter in the hole position is important, then it is necessary use special drills, since the metal tool may deviate to the side when entering wood.

If you need to make a hole with increased accuracy or large sizes, then it is better to use a special drill. They are always made from tool alloyed and carbon steel grades, which cannot be used for metal processing; they are intended for woodworking.

To ensure that the hole is of high quality and that the drill does not go to the side, before starting drilling, make a small indentation with an awl. The entire drilling process must be carried out at low and medium speeds so that there are no chips at the exit of the drill when you need to get through hole. This can be done in two ways.

1. Make a thin hole and then drill along it on both sides of the object to the middle using the required drill to obtain a circle of the final diameter.
2. The second method is when a wooden spacer is applied to the surface of the object on the side where the hole needs to be drilled, and it is removed when the work is completed.

Due to the fragility of the structure of the material, for example, chipboard from a master required Special attention to make a quality hole. The laminated or veneer surface of the object complicates the task. In this material, you must immediately make a mark with an awl and then drill a hole using a lining.

Technical capabilities of a ballerina on wood

Special tool It is made of a durable type of steel, so with this tool you can perform all work on wood, as well as other materials, with high quality. The strength of the steel will ensure a long service life for the tool.

It is important that the ballerina can perform large range tasks, the drill allows you to make holes with a radius from 20 mm to 150 mm, and the diameter will be twice as large.

Currently there is a tool that is equipped with additional plastic protective grille and this gives its advantages - increased convenience and efficiency of operation.

Types of instruments

Ballerina drill can be of several types. The single-cutter tool has a special bracket with a tightening screw perpendicular to the drill. Before starting drilling, the cutter is tightened to the required length and the screw is then immediately tightened, the drill is ready to perform its operation.

Double cutter tool has cutters that are located on the bracket. The fastening bolts in such a ballerina are located on the cutter holders; they are independently installed at the same distance before the drilling process begins.

A more complex tool is ballerina with three incisors, they are fixed on a round platform and move along special grooves.

This is exactly how the required diameter for drilling is set, it can be accurately set using the existing scale. The cutters work synchronously, so the distance from the center will always be the same. The scale greatly helps make cutting more accurate.

For small amounts of work, the ballerina drill always copes with its task and quickly pays for its cost immediately after it is used to make a couple of holes. Other types of tools for such work will cost much more and may only be needed a few times.

All photos from the article

Everyone who works with wood with their own hands sooner or later has the need to make perfectly even large holes. A standard drill will not help here, and using a jigsaw does not always allow you to maintain the optimal shape and quality of the edge.

It is in such a situation that the ballerina mentioned in the title is used, as well as some other devices. We will talk about them in this article.

Adjustable tool overview

Ballerina design

A variety of drills are used to make holes in wood, as well as in wood-based panels (plywood, OSB, fiberboard/chipboard). In this case, the diameter of the groove being formed is limited by the diameter of the drill itself, so that very often the capabilities of standard devices are insufficient.

The solution in such a situation is to use a ballerina - a special drill with movable cutting elements. It's different enough complex design, but at the same time significantly expands our capabilities in drilling holes.

The main elements of the device are:

1. The central part, which includes a small diameter twist drill, a “body” in which the cross rod is fixed, and an end piece for clamping in the drill chuck.
2. A horizontal bar (often with millimeter markings) along which the cutting elements move.
3. Two cutters secured to the rod with hex screws. In preparation for work, the cutters are moved apart to the required width and clamped in a strictly vertical position.

Note! Sometimes fixation is carried out not with hex screws, but with standard clamps for a Phillips screwdriver. The reliability of such a connection is much lower, and it is not so convenient to use, so it is better to find a hexagon model.

1. Ballerinas can have more simple design: an L-shaped movable cutter is attached to the central part. However, most often such devices are used not for processing wood, but for drilling tiles or clinker tiles.

An important factor determining the quality of a ballerina is the material from which it is made. Professional tools, which are used for processing hardwood, are made of high-strength steel with an anti-corrosion coating, and the cutters are equipped with carbide surfacing.

The price of ballerinas without coating is usually lower, but they do not last long, since cheaper metal is used for their production.

Use for drilling holes

One of the obvious benefits of adjustable wood drilling jigs is their ease of use.

The work of making a hole is carried out as follows:

1. On a board or sheet of plywood we mark the center of the future groove.

Note! It is important to ensure that the thickness of the material being processed does not exceed the value specified in the ballerina’s passport. For most devices, this figure does not exceed 15-30 mm, so to drill thicker boards you need to use other devices.

1. Using a hex wrench, loosen the mounting screws and install the cutters on the rod so that the distance between them corresponds to the desired diameter. At the same time, we make sure that the cutting elements are positioned strictly symmetrically.
2. We tighten the screws with a wrench, fixing the cutters on the rod in the selected position (the distance for most models is from 30 to 120 mm).
3. We insert the ballerina into the drill chuck.
4. We place the drill at the mark opposite the center (it can be marked with a punch or passed with a drill of a smaller diameter), after which we begin processing. We increase the pressure on the drill gradually so that the load on the cutting edges does not increase.

After the hole is made, we remove the ballerina with a piece of wood or plywood from it. The edges must be filed to remove burrs.

Other tools used for the same purpose

In addition to the ballerina, other devices can be used for processing wood:

Tool	Features of design and use
Feather drill	It is a rod with an expanded blade in the shape of a spatula and a spear-shaped tip. Drilling range from 10 to 60 mm, maximum depth – 150 mm. The quality of the edges is relatively low.
Screw drill	A device with an extended screw part: the cutting edges are extended beyond the rod, which allows you to make holes in thick wood. Drilling depth up to 600 mm, diameter up to 60 mm.

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Ballerina drill review. Drill Packing:

On back side instructions. pay attention to correct location incisors. Equipment:

The key, the device itself, the drill and the nozzle (if the hole is already drilled) Photo with a ruler:

IN a regular drill the structure did not fit. We use a hammer drill:

We test on 4 mm plywood. Smallest diameter first:

Cutters after drilling. Apparently after each hole they better with a file correct.

I'm trying to drill a 9 cm hole. I set the speed to almost minimum. It's scary to drill at high speeds:

The cutters come out of the plywood unevenly. Here you need to act carefully.

I was afraid to drill anything other than wood. After the very first hole, the cutters already required correction with a file. The holes are not quite accurate as they are set. The movement of the incisors and vibration affect. With these notes in mind, the drill can be used.

Addition. Shank diameter 1 cm

Planning to buy +23 Add to favorites Liked review +26 +46

mysku.ru

Ballerina wood drill: the device of the tool, its technical capabilities and use

Wood is almost always easy to process with various tools that have a cutting edge. Quite often, wood craftsmen have to drill into chipboard or fiberboard material using various drills to make furniture or wood crafts during construction work.

It is often necessary to make large holes, for example, in wooden house construction or for fastening parts. The holes can be through or blind, and to make holes of large diameters you will need a special drill called a ballerina. What kind of drill is this, what does it look like and what technical capabilities does it have?

Ballerina on wood

To work in a home workshop, you can get by with ordinary drills for wood and metal, but to perform special complex operations, a specialist cannot limit himself to a minimum set of tools.

Having a good electric drill, you can make a hole in wood with a diameter of no more than 2 cm using a metal drill. For hard wood or loose materials, it is necessary to select special tools that are designed for each specific case.

When craftsmen need to drill a large hole, a drill with the unusual name ballerina comes to the rescue. This is a common name, very common among woodworkers.

Using such a tool you can make holes with a diameter of up to 300 mm in materials such as:

• Tree.
• Plywood.
• Plastic.
• Drywall.
• Tile.

The ballerina consists of two cutters and a centering drill, with the help of which the circle is cut. The cutters move along the guide and set the desired diameter of the circle for cutting. The ballerina must be rotated using a drill or a rotator at low speeds, so the tools can be rotated manually.

A round drill with cutters can be adjusted to the desired diameter; the design also has a centering drill, which can be used to pre-drill into the surface of the material and fix the product.

Moving cutters with a sharp tip are designed for direct cutting of material; there is also a bracket on which moving elements are secured.

A ballerina can have a different number of incisors, from one to three, it all depends on the shape of the device and the price of the special drill.

The principle of operation of the ballerina is simple, first the central spiral drill makes a preliminary drilling in the material, and sharp sliding cutters around the circumference of the surface of the material cut a groove. They are spread to the same width from the center and then fixed with a special key.

How and with what to drill wood

To drill small holes with a diameter of 10–12 mm, ordinary metal drills are most often used. If every millimeter in the position of the hole is important, then it is necessary to use special drills, since the metal tool may deviate to the side when entering the wood.

If you need to make a hole with increased accuracy or large sizes, then it is better to use a special drill. They are always made from tool alloy and carbon steel grades, which cannot be used for metal processing; they are intended for woodworking.

To ensure that the hole is of high quality and that the drill does not go to the side, before starting drilling, make a small indentation with an awl. The entire drilling process must be carried out at low and medium speeds to avoid chipping at the exit of the drill when you need to get a through hole. This can be done in two ways.

1. Make a thin hole and then drill along it on both sides of the object to the middle using the required drill to obtain a circle of the final diameter.
2. The second method is when a wooden spacer is applied to the surface of the object on the side where the hole needs to be drilled, and it is removed when the work is completed.

Due to the fragility of the structure of the material, for example, chipboard, special attention is required from the master to make a high-quality hole. The laminated or veneer surface of the object complicates the task. In this material, you must immediately make a mark with an awl and then drill a hole using a lining.

Technical capabilities of a ballerina on wood

The special tool is made of a durable type of steel, so with such a tool you can perform all work on wood, as well as other materials, with high quality. The strength of the steel will ensure a long service life for the tool.

It is important that the ballerina can perform a wide range of tasks, the drill allows you to make holes with a radius from 20 mm to 150 mm, and the diameter will be twice as large.

Currently, there is a tool that is equipped with an additional plastic protective grille and this provides its advantages - increased convenience and efficiency of operation.

Types of instruments

Ballerina drill can be of several types. The single-cutter tool has a special bracket with a tightening screw perpendicular to the drill. Before starting drilling, the cutter is tightened to the required length and the screw is then immediately tightened, the drill is ready to perform its operation.

A two-cut tool has cutters that are located on a bracket. The fastening bolts in such a ballerina are located on the cutter holders; they are independently installed at the same distance before the drilling process begins.

A more complex instrument is a ballerina with three incisors; they are mounted on a round platform and move along special grooves.

This is how the required diameter for drilling is set; it can be accurately set using the existing scale. The cutters work synchronously, so the distance from the center will always be the same. The scale greatly helps make cutting more accurate.

For small volumes of work, a ballerina drill always copes with its task and quickly pays for its cost immediately after a couple of holes are made with its help. Other types of tools for such work will cost much more and may only be needed a few times.

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stanok.guru

What can a “ballerina” do?

Let's continue to get acquainted with various tools, today we will analyze the circular adjustable drill, the common people call him “ballerina”, apparently by analogy with appearance drills while he works with a spinning ballerina. The main purpose of this tool is to drill large diameter holes in tiles.

As you can see, there are many things you can use to drill into tiles; some people prefer to work with a ballerina, while others prefer to use crowns. Let's continue.

With its help you can drill “holes” in tiles with a diameter of 30-90 mm. As we see, maximum size is very large, it will be difficult to find such a crown (I won’t say anything about how much it will cost), so when you need to make a hole larger than 60 mm (as a rule, crowns are sold individually up to this diameter), you have to use a “ballerina”.

It consists of a centering drill and a second cutting element fixed parallel to it and moving along a guide. The cutting part and centering are equipped with hard alloy tips, which actually cut the tiles. The main cutting plate moves along a guide, the minimum diameter is 30 mm, the maximum is 90 mm. The moving cutting part is secured using a bolt.

From this we can conclude that, if desired, you can drill a hole of any diameter in the range of 30-90 mm. Agree, you are unlikely to be able to find a diamond crown with a diameter of, for example, 53 mm. But such a circular drill will cope with the task without any problems. That is why they are in demand among finishers involved in cladding. It can be safely called universal - any diameter within the tolerance without problems.

According to customer reviews, these drills have proven themselves well when working with tiles. Of course, the cut is not as smooth and even as when working with a crown, however, if a clean cut is not required (for a socket in a tile, for example), then purchasing this drill will be optimal.

How to work correctly?

The work is done using a drill; if it is an impact drill, then the impact mode must be turned off.

We drill at low speeds, it is very important that carbide inserts do not overheat, then your drill will serve you for a very long time. I remember once the neighbors called a plumber, so he got a ballerina that looked as if it had been worked on for many years. I already thought that the master would not be able to do anything for them, but to my surprise, the hole in the tile was made quickly and very efficiently. This is what it means to use a tool correctly. The master drilled carefully, at slow speeds, without pressing hard on the drill. The tile was drilled like clockwork.

The price for it is around 230 rubles, if you look at how much diamond crowns cost, then it’s better to buy it, it will be cheaper. At correct use it will pay for itself many times over. Of course, if the holes must be neat and even, then priority is still given to crowns.

It turns out like this:

If you need holes, the edges of which will still be hidden later, then take a ballerina. - If the “holes” are clean (you won’t hide the edges) - then there will be crowns.

And of course, a video about how to use this very “ballerina”.

As you can see, everything is simple and clear. Hold on, tiles now))

Another note: How can you unscrew a broken bolt?