Ballerina on wood. We can handle any diameter! Ballerina for wood and other drills: overview of designs and features of use Circular adjustable drill for metal

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 a round hole is used with a wood drill. In this case, the hole size is limited by the diameter of the drill. To create round openings big size developed drill special design- ballerina on 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 under 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 possibility of stable fixation of the tool allows the use of a ballerina drill in limited space– for example, inside assembled furniture, as well as on curved surfaces. Particular attention is required when drilling surfaces with a 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, which 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-incisor 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. Quality construction 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 an anti-corrosion coating is not able to withstand heavy loads. Cutting edges Low quality quickly lose their edge. 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 The problem will be the use of an adjustable circular ballerina drill - thanks to the combination of a budget price and high quality work.

Popular construction material, representing natural wood, has unique characteristics and durability, and can be easily processed with various carpentry tools. Among the large list of devices, the ballerina drill for wood has special properties, allowing you to make through or blind round holes of different sizes.

Features of the device

The design of the device is simple, reliable and high-performance. A circular drill, or ballerina drill for cutting gaskets, consists of a central drill with a groove, a round or triangular shank, two carriages and cutters located on the arms of the bracket.

The purpose of the drill is to mark the center for the hole and provide support for the device during rotation. There are special markings on the bracket rod for installing the sliding carriage in the desired position. The cutters are fixed with screws, and the spread of the working edges is checked with a caliper.

A distinctive feature of a ballerina with one knife is the asymmetrical design and a noticeable lever that counteracts rotation, creating a high range of oscillation of the instrument. For this reason, experts recommend using the device on a stationary drilling machine. This will help prevent the work material from falling off and protect the worker.

The best option when working with a drill, screwdriver, hammer drill or rotary hammer is a system of two cutters that compensate each other in terms of balance during rotation. The disadvantage of the design is the rapid heating of the cutting part; the drill must cool down several times during the task. To maintain the functionality of the tool, it is recommended to maintain an operating mode ranging from 1000 to 1400 rpm.

Types of instruments

Adjustable carpentry tools are available in several modifications, on the brackets of which 1, 2 or 3 cutters can be installed simultaneously. The design of the drill depends on the type of bracket, which can be in the form of a disk with slots for a cutter or a round axis with a hole for a cutting element. As an additional device, the central axis of the shank may have soldered knives for removing straight or rounded chamfers.

Characteristics of a wood drill

When working with hard wood, fiberboard, chipboard, plasterboard and plywood, drills are selected individually, taking into account the thickness of the material, which should not exceed 1.5 cm. A do-it-yourself wood ballerina is assembled from a set of drills and replacement parts included in the equipment set . The structure can be rotated with a rotary hammer, drill or drilling machine at low or medium speeds.

The work process is divided into several stages:

1. Drilling with a central twist drill,
2. Cutting paths around the circumference,
3. Removing a cut element.

The main condition for working with loose wood is the choice of tools for drywall. When making blind or through holes, fixtures made of carbon and alloy steel are used.

There are two ways to drill a quality hole with smooth edges:

1. By drilling a small diameter grommet from both sides to the middle of the board
2. By drilling through a wooden spacer.

Working on material with a laminated or veneer surface requires preliminary marking of the drilling location with a core or an awl.

Device capabilities

The device for working with wood has a long service life and lends itself well to sharpening knives under the right angle, makes it possible to create a gap with a radius from 2.0 to 15.0 cm. For safety reasons, the master is recommended to use a tool equipped with a protective grill screen.

Characteristics of a metal drill

A tool is used to drill a hole in metal special purpose. The most popular device is considered to be a one-sided ballerina drill for metal, with a cylindrical axis and cutters with a cutting edge made of pobedite. Before drilling, a hole with a diameter of 0.9 cm is created in the metal for the hook of the tip of the central axis of the circular drill. The device allows you to make a through or blind cavity with a diameter of 40 mm to 150 mm.

For large hole diameters on MDF, plastic, multi-layer plywood, use special tools with cutting knives allowing to create cavities with a radius of 300 mm. Similar in design, but with excellent characteristics, devices cut ceramic and tiles. Each device model is provided with accompanying documents indicating design features equipment and the maximum thickness of the processed material.

A ballerina for cutting gaskets can most often look like a shank with a flattened cutting part and a screw tip. The feather drill has a large working potential and is produced from alloy steel in different dimensional parameters allowing drilling of plastic of any thickness.

Home craftsmen do most of their work with wood and wood-based materials. Apart from solid wood, all other materials are considered sheet materials. To connect elements to each other and lay communications, it is necessary to drill many holes. Tool for drilling holes large diameter, is called a circular drill, and is popularly called a ballerina.

With his help can be drilled holes with a radius of 20−150 mm. The diameter of the resulting holes will be 40−300 mm.

Wood drill

Ballerinas are widely used when drilling wood, as it is easy to process. In addition to solid wood, home craftsmen use wood-containing materials in their creativity:

• fibreboard (fibreboard);
• chipboard (chipboard);
• oriented strand board (OSB);
• multilayer plywood.

Home craftsmen use different drills to make holes of different diameters: for metal, for wood. But with their help, holes with a maximum diameter of 32 mm are obtained. In this case, depending on the density of the material being processed, the shape may turn out to be non-round or shifted to the side.

When drilling end-to-end holes at the outlet, chips form. To prevent them, you can use two methods.

1. Initially, a small diameter hole is drilled. After that, a hole of the required diameter is drilled on each side to half the thickness of the part.
2. A wood gasket is installed under the back side of the part, at the point where the tool exits. When the tool comes out, the tight compression will not allow the fibers of the material to be pulled out.

The second method is used when the surface of the product is covered with veneer or laminated. The cladding is quite fragile and when exposed to cutting tool starts to crumble.

A ballerina drill for wood is made from carbon, tool, and alloy steels, which are not suitable for processing hard materials: metal, tile, porcelain stoneware. But they cut drywall and plastic easily.

Two-incisor ballerina looks like an ordinary one compass. But the design is much more complex. The bracket and cylindrical shank are manufactured in one piece. There are two holes in the bracket. A centering drill is installed in one. A rod is installed in the second. Both are secured with screws.

To set the required diameter, the cutters move along the rod. It has a vernier scale on it. The tool holders are also secured with screws. The incisors are shaped like a knife. The oblique edge of the cutter should be directed in the direction of rotation, clockwise.

If the drill becomes dull during operation, it can be easily replaced. If the incisors become dull, then, having the skills to work on sharpening machine, they can be refilled. The shank of the structure is fixed in the chuck electric drill. It is worth remembering that the small power of a power tool may not be enough to work with a ballerina, unlike metal drills.

Types of instruments

In addition to the classic two-cutting version of a circular drill, there are one- and three-cutting models. In the design of a single-cut drill, the cutting part is directly fixed to the rod. The cutter and centering lance are equipped with carbide plates. They make it easier for a ballerina to work on tiles.

In three-incisor models, the incisors are mounted on a round platform on which there are grooves. The cutters move along these grooves. They have a scale. Correctly set size allows you to cut more accurately and quickly.

Currently, some models are equipped with a protective grille made of plastic. It improves work efficiency and convenience.

Metal ballerina is equipped with plates made of solid alloy with cutting edge sharpening turning cutter. High cutting force dictates the use of stationary or portable radial drilling machines. Basically, holes are cut in galvanized sheets, the thickness of which does not exceed one millimeter.

Advantages and disadvantages

The advantages include:

• possibility of changing the centering element;
• equipped with two types of centering elements;
• cutters can be sharpened;
• no additional processing required;
• reliable design;
• the locking screws are fixed by a cone;
• The screws are tightened using a hexagonal socket wrench.

Among the disadvantages it is worth noting:

• poor sharpening of cutters;
• on inexpensive models when processing large diameters, breakage is possible;
• A high power drill is required.

Technical capabilities

The main use of ballerinas remains cutting sheet material. The ability to adjust the diameter allows you to use one tool for several purposes. Two or more cutting elements allow you to obtain a high-quality processed surface.

You can use a circular drill to machine almost any sheet material, used in construction, repair and decoration of premises. Carbon steel gives the structure strength. Special coatings are used to protect against corrosion.

The price range depends on the material of construction and cutting part, manufacturer, size and number of cutting elements.

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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 it is better to correct them with a file.

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 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 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 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 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 through hole. This can be done in two ways.

1. Do thin hole and then drill along it from 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 from durable appearance 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’ll look at a circular adjustable drill, popularly called “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 insert moves along the guide, minimum diameter 30 mm, maximum 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 the carbide plates 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?

Any person who works with wood or wood-based materials quite often needs to drill a round hole of large diameter in a sheet plate. Of course, you can use a jigsaw and cut out the required circle with it, but this is not always convenient. In such situations, a wood ballerina is used, which is a special device for obtaining exactly round holes large diameters.

Ballerina device

The design of this tool is simple; in the most common version, it is a bracket with a drill fixed along its axis of rotation. This center drill not only marks the center of the future big hole, but also provides support for stable rotation of the entire device. On two opposing arms of the bracket there are two carriages with cutters fixed in them. The bracket rod is specially marked, which allows you to install carriages with cutters with fairly high accuracy. Having spread the lateral incisors to the required distance, they are fixed on the bracket with clamping screws, after which work begins. It would be a good idea to check the spread of the cutting edges using a caliper.

In addition to this, there are several more modifications, in which there are one, two or even three incisors. They differ different designs bracket - this can be a disk along which cutters move in special slots to adjust the diameter. Also, in the axis on which the ballerina rotates on wood, a hole is drilled, straight or at an angle, and a cutter is inserted through it, fixed with a locking screw. This also makes it possible to adjust the diameter of the resulting circle, and one cutter does a good job, especially if it is made of good steel and used correctly.

The shank of the central axis can be round or have special form for fixation in an SDS chuck. Knives are used quite often various shapes, capable of removing straight or rounded chamfers where necessary.

Purpose and application features

The main and only purpose of this special tool is to cut neat round holes with a diameter of up to 300 mm. The materials processed are different - wood, plywood, chipboard, MDF, fiberboard, plastic panels, drywall. There is a similar tool for cutting holes in ceramic tiles and similar hard materials. All of them have one thing in common - the thickness of the slab should not be too large. The accompanying documents with which the ballerina wood drill is sold most often indicate a maximum material thickness of about 15 mm.

Experts note that a peculiarity of the use of ballerinas with one cutter is quite high beats due to the asymmetry of the design and a noticeable lever that counteracts rotation. Therefore, such devices are used, as a rule, in stationary drilling machines. This not only reduces the risk of the workpiece being torn off, but also saves the worker’s hands.

There are, however, many places where you have to work with hand drills, screwdrivers or hammer drill. In this case, a two-incisor system is used, since the two incisors largely compensate each other. But even in such cases, caution, attention and accuracy are required. It is also necessary to give the tool a “rest”, since drilling holes is about 150–200 mm. create a significant load on it. The breaks allow the incisor (or incisors) to cool down. In general, this is not a device that tolerates haste and inattention. The presence of a laminated coating or veneer on the material also does not simplify the task - special care is required and the use of an output lining is required. Operating at too high speeds is not recommended; as a rule, 1000–1400 rpm is sufficient.

Advantages and selection criteria

The advantages of a ballerina are as follows:

• obtaining neat holes with a diameter of up to 300 mm;
• simple and reliable design;
• low price, which, if it is necessary to make only a few holes (in everyday life, for example), turns out to be decisive;
• Possibility of adjusting the diameter.

Many people argue that where woodworking is used, crowns or circular saws could be used. However, the crowns have a fixed diameter without the possibility of adjustment and a rather high price. Therefore, they are more often used in such work where it is necessary to cut a large number of identical holes (for fastening standard lamps, sockets, etc.). If you need to work with multiple holes various diameters a ballerina would be more suitable.

You should choose this device carefully, using criteria that are important for any instrument. This is the quality of workmanship, the accuracy of sharpening knives, the reliability of fixing structural elements and other subtleties known to anyone who has at least occasionally encountered cutting equipment. Despite this, many choose a ballerina based only on such criteria as cost. These people should be even more careful, since a cheap tool may not have the proper characteristics and can be quite dangerous. You should always remember that rotation occurs with high speed and an insecurely fixed cutter can hit a person or simply fly to the side with an unpredictable result.

However, for domestic use, for small amounts of work or the need to drill several holes different diameters The ballerina on wood shows its good side and, thanks to its low cost, pays for itself quite quickly. It is not always justified to use other types of tools for such tasks.