Overview of hobby drills. Electric and pneumatic drills: types, applications for small jobs Which stand is better for a drill

Continuing detailed overview drills, we move on to the category of micromotors. At the moment, this is one of the most popular types. And we will be guided by the reviews. very reliable and what is even more maneuverable than sleeve ones.

The MICROMOT drill is a power tool whose motor is attached behind the handpiece. They are intended for fine work on ceramics, wood, precious metals, non-ferrous metals, plastic.

Consider the MICROMOT drills of the most popular manufacturers.

Proxxon

The Germans have thought of everything to the smallest detail. The Proxon drill fits perfectly in the hand, is able to work without loss of quality and speed at any angle. She does not have rubber inserts on the handle, but this is not a drawback.

The body is made from special plastic, durable and anti-slip properties. As for power, this drill will plug any other into the belt and for major works. But what is especially pleasant is its weight (270 g). Especially all these advantages are visible in the Proxxon MICROMOT 230/E model.

Drill DPM 25-2

Her tip is medical, she sits comfortably in her hand, the price is more than affordable. Her main disadvantage- this is a medical tip. It does not withstand heavy loads and quickly fails. As for the repair, after the first breakdown, the machine can be thrown away, because the carbon brushes of this unit are quickly erased and it is impossible to replace them.

Marathon

It is produced by Korea, and for most masters, the drill is attractive in terms of functionality. She has high speed (30,000 rpm), excellent power. Among the shortcomings is the price. Marathon is not cheap, and for all its classiness, it does not withstand power surges. But in our realities, such drills do not live long.

Dremel engraver

There will be a lot of dissatisfied with this unit. Especially the Dremel engraver 290-1. Only 6,000 rpm, the design itself, although small, does not fit well in the hand. The possibilities are very limited: you can not drill, grind. You can work only if you take it like a ballpoint pen.

The Dremel 200 is another matter. There are more revolutions (35,000 rpm), there are a full set of possibilities, but the body is a bit thick. In addition, it is short in itself, more precisely, the length that is, may not be enough for work.

Bosch

Well, which of the masters did not dream of a drill of this company? She looks very beautiful and alluring. In terms of functionality, it is comparable, perhaps, with Proksonovskaya, but there is one “but”. The entire filling of this unit is very sensitive to force. If you are used to frequently changing speeds in the process and working with hardwoods, then you will have to think not about how to do the job, but about how to save the machine, and very expensive one at that.

With such technical device, as a drill, everyone who at least once in his life found himself in the chair of a dentist is familiar. Meanwhile, the dental office is not the only place where a pneumatic or electric drill is actively used as the main working equipment. Using such devices equipped with nozzles of various types, professional specialists and home craftsmen perform the finest processing of parts made of different materials, manufacture products decorative purpose and successfully solve a whole range of other tasks.

Areas of use

The drill, the main working body of which is a high-frequency rotating shaft with the function of a spindle that transmits rotation to the tool, is actively used today by both professionals and home craftsmen, who also appreciated the versatility and efficiency of such a device. In addition to the already mentioned dentistry, where pneumatic drills are mainly used, such devices are necessary for:

instrumentation, where drills are used as mini-drills and compact polishing devices;
manufacture of products for decorative and applied purposes (carving on wood, stone and bone, applying inscriptions and patterns to the surface of products from different materials (engraving));
jewelry, where with the help of such equipment are created beautiful jewelry from various materials.

In order to turn the drill, which, in fact, is a drive device, into multifunctional equipment, it is equipped with special working nozzles. Each of them is designed to solve certain technological tasks. Yes, most popular types working nozzles used in a set with drills are:

drills that turn the drill into a mini-drill;
milling cutters, with the help of which the drill performs the processing of both flat and shaped surfaces, as well as holes of various configurations;
disk mini-tool designed for cutting the material being processed;
an engraving tool used to apply inscriptions and patterns to the surface of the workpiece;
tools used to clean the treated surface from traces of corrosion and various pollution, as well as its grinding and polishing.

Modern models of dental drills differ from conventional dental devices not only in that they are electric rather than pneumatic, but also in the presence of additional options(in particular, the ability to adjust the spindle speed). The most reputable manufacturers of such devices are Dremel, Omax, Proxxon and PowerMax.

If we talk about the degree of autonomy of electric drills (engravers), then, depending on this parameter, such devices are divided into the following types:

stationary equipment;
manual engraving devices;
compact cordless drills;
models operating from the central power supply network.

Design features

When deciding how to choose a drill or how to make it yourself (which is quite possible), you should understand the design and principles of operation of this equipment. The main elements of any drill are:

a tip on which working nozzles are installed;
an electric motor, which can be collector and brushless;
a device that provides power to the drill motor.

It is clear that the drill is pneumatic, powered by energy compressed air, does not have an electric motor in its design. In the event that a brushless type electric motor is installed on the drill, it additionally contains a special control unit that ensures the creation of a variable magnetic field between the stator and rotor of the drive motor. A collector drill, unlike a brushless one, can be connected to a source direct current directly.

Comparing drills of collector and brushless types, you need to pay attention to the following points:

Collector drills are easier to manufacture and, accordingly, cheaper. To ensure their work does not require an expensive control unit.
Brushless drills are more powerful and are able to provide a rotational speed of the tool used in the range of 50–60 thousand rpm, while collector drills develop a speed not exceeding 45 thousand rpm.
The presence in the design of the collector devices of an intensively rubbing assembly (brushes and the surface of the collector) leads to their significant heating during operation, which requires effective ventilation of the electric motor of the drill.
The presence of a rubbing assembly in the design is also the cause of a significant loss of power in collector-type drills. Because of this, the efficiency of collector devices is only 60–70%, while for brushless devices this parameter is at the level of 90%.
To increase the power and the amount of torque that collector electric motors create, it is necessary to increase the size of the device.
The brush-collector assembly itself is the cause large sizes collector devices, when compared with brushless ones.
Collector drills are also characterized by more high level noise at work.
The service life of collector drills is somewhat less than brushless drills.

In general, summing up all of the above, we can say that, in terms of the ratio of the most significant parameters, collector drills are the most preferable option in most cases, which is confirmed by the high popularity of devices of this particular type. More expensive, difficult to manage and maintain brushless drills are purchased when you often have to process very hard materials.

How to choose the right grinder

Regardless of what you buy the device for - for small jobs in the home workshop or for professional use, - it is very important to choose this mini-equipment correctly. The parameters of such a device, which should be paid special attention to, are:

the speed of rotation that the drill spindle is capable of developing;
device power;
force, or the torque generated by the drill.

A set with two drills: a full-fledged network drill for basic work and a miniature low-voltage drill for "small things"

Many of those who purchase a drill to perform simple work in the home workshop opt for high-speed models, which is not entirely correct. For most of these works (and for solving most professional tasks related to drills), models capable of developing a spindle speed of up to 35–40 thousand rpm are quite suitable. In particular, the tool with which ceramics are processed should rotate at such a speed, and for work on more soft wood more modest parameters are enough. It should also be borne in mind that a drill that can operate at very high speeds is much more expensive than its less resourceful counterparts. Therefore, you need to think carefully about whether you need expensive device options that you will use very rarely or not at all.

More important in practical terms, the characteristic of any drill is the torque that such a device is capable of developing.

There is a direct relationship between the torque and the power of the drill, so special attention should be paid to this parameter. most minimum power from those presented on modern market models have compact drills, which are often called micromotors. Such mini-devices, the working nozzle of which is combined in one housing with a drive electric motor, do a good job of finishing products from various materials. Working attachments for this equipment (both straight type and angled) are small diameter drills, mini-mills, grinding and polishing heads. It should be borne in mind that micromotors, like pneumatic engraving tools, are not designed to be used in conjunction with massive working nozzles and for rough work.

Technical drills have higher torque and, accordingly, power. Such devices, the straight or angled working head of which is actuated by means of flexible shaft, are equipped with a powerful electric motor that can successfully cope even with fairly high loads. The working nozzles themselves, which are equipped with such drills, also have a reinforced design, which allows them to be used in conjunction with overall and heavy tools and perform roughing of products made from various materials with their help.

Technical drills with high power and working mainly at medium speeds, are not very suitable for performing delicate work. This is also explained as follows. The working nozzle (straight or angled) installed on such equipment is driven by a flexible shaft, which heavily loads the hand, and this can cause marriage in the process of performing delicate work.

There are more and more drills from various manufacturers with different technical characteristics, which are also expressed in different units of measurement, appearing on the market. This is confuses dental technicians, and when buying, they are guided by 1-2 parameters, not always correctly assessing their significance. Let's dwell on the main mistakes that are made when choosing a drill. By the most important parameters, such as:

value for money,
acceptable power
well-established manufacturing technology,
simplicity of the electronic regulator

collector micromotors are still ahead of brushless ones and are used in most dental operations. Therefore, here we will only talk about collector drills. Speed The main indicators by which technicians usually choose a drill are: speed ( speed); power; an effort ( torque). For some reason, many people think that main indicator good drill - the number of revolutions: the more it is, the better. However, any experienced technician will confirm that 50,000 rpm is overspeed. Firms use an inflated figure as a marketing ploy, diverting consumer attention from other parameters in which they lose. In fact, 35-40 thousand revolutions is quite enough to perform almost all dental work. For example, carbide burs and cutters are designed for speeds up to 15 thousand rpm, and diamond burs for processing ceramics - for speeds up to 35-40 thousand rpm. It is not a problem to accelerate the drill to high speeds - you just need to take a power supply with a higher voltage, but can the bearings withstand such a speed and how long can they support it under load and without it? Will the windings of the tip burn out at a load greater than it is designed? In practice, where more important parameter is an engine torque (or it is also called torque). This is the value that determines the power of the drill. The larger it is, the more comfortable the equipment is to work.

Torque influences the machining result drill as on the dynamics of the car: when working under load ( e.g. with hard material) a motor with high speeds, but insufficient torque will slow down, the speed of the tool will decrease, and in the worst case, the drill will simply stop. A motor with a large torque will not slow down, but will continue to work confidently. Therefore, serious manufacturers pay attention to the constantly high value of the torque, and not at all to the number of revolutions. By the way, too high revolutions of the drill can be simply dangerous: in this case, the cutter often breaks and the technician is highly likely to get injured. That is why, for example, AVERON micromotors have a speed limit and do not accelerate to 50 thousand ( they are not allowed by the "smart" control unit). Torque, power, speed, voltage - like everything
it is tied in a drill Another important characteristic of the drill is the power consumption, but you need to know what exactly the manufacturer indicated in this case: 1. What is the power? The fact is that power can be mechanical, electrical, shaft... 2. How was it measured? Sometimes, for advertising purposes, manufacturers indicate the maximum moment when the drill almost stopped and the speed when nothing acts on the shaft ( drill is idling). And then they multiply... It turns out the power of the drill failure. In fact, this is the same as specifying a maximum speed for a car ( measured on a flat road) and maximum thrust ( measured in first gear). But! Nobody rides in first gear with maximum speed. In fact, the rotation speed of the drill ( rpm) is related to mechanical power by a simple relationship: P mechanical ≈ 0.1 × M × n P - power, M - torque, n - number of revolutions per minute (rotation speed). Those. the greater the power of the drill P, the greater the moment M or great speed you can get it. Move on. For example, on a micromotor it is indicated 350 gsm and 50,000 rpm. This means that it must have mechanical power (see the formula above):

P mechanical = 0.1×0.0350×50000 = 175 W

Have you ever held a 100-watt light bulb with your bare hand? Here is a micromotor heated to such a temperature that it is impossible to hold in your hand, plus it will quickly burn out. So you can turn on the drill at maximum loadonly briefly. The rest of the time it should work at medium speed in order to last the period promised by the manufacturer. Hence, "350 gsm, 50,000 rpm" is almost perfect, not operating characteristic . And pay attention that we considered the operation of the micromotor at an average load. With further load, the handpiece slows down even more, the rotation speed drops, while the efficiency decreases even more, even more energy goes into heat. Control block The real power of the drill is determined precisely by the power of the control unit: the same tool can be equipped with a unit of both 15 W, 30 W or 60 W, and in each case it will work differently. In promotions often they indicate the power of the handpiece, not really caring about indicating the power of the control unit, so the figure turns out to be many times overestimated. Very often there are cases when the micromotor is 350 gsm, 30,000 rpm. it is completed with a control unit, in which there is a transformer for 10-20 W, but while declaring the maximum tip settings. However, the power of the control unit is far from everything. In the same case, there may be completely different electronic filling, namely, it determines the "intelligence" of the device. Many, especially inexpensive drills, have only primitive on/off and power controls. Whereas the "smart" control unit is a complex electronics that allows you to control many important functions: smooth acceleration and quick, but smooth stop of the rotation of the tool; smooth speed control; protection against power surges in the network; pedal connection; reverse move; power consumption control. The more protective and control functions in the power supply ( blocking the spontaneous start of the engine when changing the mode, protection against overheating of the handpiece and control electronics, etc.), the more difficult and expensive it is to manufacture. But thanks to the protection system, a drill with a “smart” control unit lasts much longer. BUT saving on "intelligence" can lead to you having to buy a new one too quickly. Naturally, all serious manufacturers provide their micromotors with high-quality electronics. But our company went even further in this matter by offering an environmentally friendly drill BM ECO, where the control unit also provides:

1. Auto power on hoods when starting the micromotor. Why it's important: If the technician forgets to turn on the hood, the table and the area around it will instantly be covered with a layer of plaster dust. And this is not only dirt and marriage in work, but also harm to health.

2. Automatic shutdown of the hood. Thanks to the auto-shutdown, idling and, consequently, equipment wear and tear, as well as unnecessary energy costs, are prevented. Saved work time(try to count how many times a day you would need to turn on / off the hood).

3. Comfort and ergonomics. The control unit is easily adapted to any table with built-in hood. It can be placed on a special bracket under the tabletop, freeing workplace from unnecessary elements and wires. It is turned on in two ways - by the encoder button on the desktop control panel and by the pedal.

4. stable work, because provides overload protection, smooth start and soft stop. In general, the indicator of speed stability when processing hard materials in BM ECO is one of the best.

5. Power consumption control. When at a given speed we increase the load, the power take-off from the source increases. To prevent the motor from shutting down due to overload, as the torque increases, the speed is automatically reduced, maintaining a constant power without reducing the torque.

6. Idling control. If you accidentally turn on the drill, and it spins at idle without load, the control unit will automatically turn it off after 10 minutes, protecting it from accidental injury, wear of the micromotor and unnecessary power consumption. power consumption.

There are more and more drills from various manufacturers with different technical characteristics, which are also expressed in different units of measurement, appearing on the market. This confuses dental technicians, and when buying, they are guided by 1-2 parameters, not always correctly assessing their significance. Let's dwell on the main mistakes that are made when choosing a drill.

According to the most important parameters, such as:

value for money,
acceptable power
well-established manufacturing technology,
simplicity of the electronic regulator
collector micromotors are still ahead of brushless ones and are used in most dental operations.

Therefore, here we will only talk about collector drills.

Speed

The main indicators by which technicians usually choose a drill are:

speed (number of revolutions);
power;
force (torque).

For some reason, many believe that the main indicator of a good drill is the number of revolutions: the larger it is, the better. However, any experienced technician will confirm that 50,000 rpm is overspeed.

Firms use the inflated figure as a marketing ploy, distracting the consumer's attention from other parameters in which they lose. In fact, 35-40 thousand revolutions is quite enough to perform almost all dental work. For example, carbide burs and cutters are designed for speeds up to 15 thousand rpm, and diamond burs for processing ceramics - for speeds up to 35-40 thousand rpm.

It is not a problem to accelerate the drill to high speeds - you just need to take a power supply with a higher voltage, but can the bearings withstand such a speed and how long can they support it under load and without it?

Will the windings of the tip burn out at a load greater than it is designed? In practice, a much more important parameter is the engine torque (or it is also called torque). This is the value that determines the power of the drill. The larger it is, the more comfortable the equipment is to work.
Torque, power, speed, voltage - like everything
it is tied in a drill

Another important characteristic of the drill is the power consumption, but you need to know what exactly the manufacturer indicated in this case:

1. What is the power? The fact is that power can be mechanical, electrical, on the shaft ...
2. How was it measured? Sometimes, for advertising purposes, manufacturers indicate the maximum moment when the drill almost stopped and the speed when nothing acts on the shaft (the drill is idling).

And then they multiply...
It turns out the power of the drill failure. In reality, this is the same as giving the car maximum speed (measured on a flat road) and maximum traction (measured in first gear).

But! No one drives in first gear at top speed. In fact, the rotational speed of the drill (rpm) is related to the mechanical power by a simple relationship:

P mechanical ≈ 0.1×M×n
P - power,
M - torque,
n is the number of revolutions per minute (speed of rotation).
Those. the greater the power of the drill P, the greater the moment M or the greater speed can be obtained.

P mechanical = 0.1×0.0350×50000 = 175 W

The mechanical power of rotation is obtained by converting electrical power which is supplied from the power source. This transformation comes with a loss - half electrical energy goes into heat (at an efficiency of 50%). This means that at 350 gsm and 50,000 rpm, the drill should consume 2 times more from the network - 175 W × 2 = 350 W.

The rest of the time it should work at medium speed in order to last the period promised by the manufacturer. Therefore, "350 gsm, 50,000 rpm" is near ideal, not performance.

And note that we considered the operation of the micromotor at an average load. With further load, the handpiece slows down even more, the rotation speed drops, while the efficiency decreases even more, even more energy goes into heat.

Control block

The real power of the drill is determined precisely by the power of the control unit: the same tool can be equipped with a unit of both 15 W, 30 W or 60 W, and in each case it will work differently.

In promotions, they often indicate the power of the handpiece, not really caring about indicating the power of the control unit, so the figure is many times overestimated. Very often there are cases when the micromotor is 350 gsm, 30,000 rpm. it is completed with a control unit, in which there is a transformer for 10-20 W, but at the same time the maximum parameters of the tip are declared.

However, the power of the control unit is far from everything. In the same case, there may be completely different electronic filling, namely, it determines the "intelligence" of the device. Many, especially inexpensive drills, have only primitive on/off and power controls. Whereas the "smart" control unit is a complex electronics that allows you to control many important functions:

smooth acceleration and quick, but smooth stop of tool rotation;
smooth regulation of rotation speed;
protection against power surges in the network;
pedal connection;
reverse move;
power consumption control.

The more protective and control functions in the power supply (blocking the spontaneous start of the engine when changing the mode, protection against overheating of the handpiece and control electronics, etc.), the more difficult and expensive it is to manufacture. But thanks to the protection system, a drill with a “smart” control unit lasts much longer.

And saving on "intelligence" can lead to the fact that you have to buy a new one too quickly. Naturally, all serious manufacturers provide their micromotors with high-quality electronics. But our company went even further in this matter by offering an environmentally friendly drill BM ECO, where the control unit also provides:

1. Automatic activation of the hood when the micromotor starts. Why it's important: If the technician forgets to turn on the hood, the table and the area around it will instantly be covered with a layer of plaster dust. And this is not only dirt and marriage in work, but also harm to health.

2. Automatic shutdown of the hood. Thanks to the auto-shutdown, idling and, consequently, equipment wear and tear, as well as unnecessary energy costs, are prevented. Saves working time (try to count how many times a day you would need to turn on / off the hood).

3. Convenience and ergonomics. The control unit is easily adapted to any table with built-in hood. It can be placed on a special bracket under the tabletop, freeing the workplace from unnecessary elements and wires. It is turned on in two ways - by the encoder button on the desktop control panel and by the pedal.

4. Stable work, because provides overload protection, soft start and soft stop. In general, the indicator of speed stability when processing hard materials in BM ECO is one of the best.

5. Power consumption control. When at a given speed we increase the load, the power take-off from the source increases. To prevent the motor from shutting down due to overload, as the torque increases, the speed is automatically reduced, maintaining a constant power without reducing the torque.

6. Control of idling. If you accidentally turn on the drill, and it spins at idle without load, the control unit will automatically turn it off after 10 minutes, protecting it from accidental injuries, wear of the micromotor and unnecessary power consumption.

A wood carving drill, equipped with various working nozzles, is equipment with which to wooden surface you can apply not only various inscriptions and patterns, but also relief images. To perform wood carving, you can use not only special engravers designed for wood carving. this material, but also drills that equip dental offices.

Beginning craftsmen who consider a wood engraver to be a complex piece of equipment should acquire the appropriate knowledge and master certain skills before starting work. There are many models of such devices on the modern market, which can cause certain difficulties in choosing, especially for those who are just going to do such an exciting business as woodcarving.

How to choose woodworking equipment

Knowing the main criteria that should be followed when choosing a wood engraver, purchase desired model not so difficult. Such criteria, in particular, are the power of the drive motor and the number of revolutions that it is capable of delivering, as well as the torque it develops.

none of modern models drill, unfortunately, does not combine two important features: ability long time work at high speeds and resistance to increased loads arising during processing. In this regard, craftsmen who are going to purchase wood drills have to make a choice between powerful, load-resistant and high-speed devices. The best option in such cases, it is the acquisition of two models of engravers with different technical capabilities at once.

If you are going to devote yourself to woodcarving and immediately purchase technical equipment for this purpose, it is better to opt for equipment such as:

powerful drill, the working tip of which has a reinforced design;
micromotor of compact dimensions, capable of operating at high speeds.

You can save on the purchase of a wood carving engraver by making such a device with your own hands. To make your engraver, you must prepare:

old electric motor washing machine or other household appliances(its power must be sufficient for the manufactured device);
elements of a belt drive, with the help of which the rotation from the motor shaft will be transmitted to the drill sleeve;
the sleeve (flexible shaft) of the device itself;
nozzle in which the used working tool will be fixed.

If the electric motor and belt drive mechanism can be selected from old household appliances, then the flexible shaft and nozzle will have to be purchased additionally. Naturally, to make a drill with your own hands, you will need at least minimal technical knowledge and skills, as well as a set of locksmith tools.

You can make an engraver for woodcarving on your own even more in a simple way. To do this, you need to purchase a flexible shaft, which can be installed on a conventional electric drill or a screwdriver. The use of such a shaft with a nozzle eliminates the need to think about how to connect the drive motor to the drill sleeve.

Types and manufacturers of drills

On the domestic market there is a wide variety of drills and engravers that can be successfully used for woodcarving. When choosing such equipment, you need to know for what tasks and with what tool it will be used.

Drills for technical purposes

Drills of this category are distinguished by a sufficiently high power, which makes it possible to effectively use such equipment to solve various problems. technical tasks. It is also represented by the products of the Russian trade mark "Profile", under which sleeveless drills equipped with a pedal are produced, which makes working with them more convenient and comfortable. Using technical drills produced under this brand, you can perform various technological operations - drilling, boring, grinding, etc. Meanwhile, when choosing such equipment, it should be borne in mind that it operates at low speeds.

Drill cartridge "Profil-B-04" is designed for nozzles with a shank diameter of up to 6.5 mm

Powerful, reliable and functional drills technical purpose produced by the American company Foredom SR. They can be equipped with power collets and quick-release nozzles, which allows you to successfully use working tools. various types. It is also important that purchasing spare parts and accessories for drills from this manufacturer on the domestic market does not present any particular problems.

micromotors

Micromotors are compact drills or engravers that can be used for woodcarving. Them design features consist in the absence of a flexible shaft and the location of the drive motor in the rear part of the working nozzle itself. It is very convenient to use such engravers for fine wood carving.

Among similar products manufactured by domestic manufacturers, it is necessary to highlight the micromotor model DPM 25-2, which is equipped with a specialized medical handpiece. Despite its relatively low cost, this micromotor has decent technical characteristics, it is easy to use and can be used with various types of working tools. However, it should be borne in mind that the medical handpiece, which is equipped with such a micromotor, is not intended for intensive loads, therefore it is advisable to use such equipment only for performing simple work and fine woodcarving. If the operating conditions of the micromotor of this model are not observed, the engine may fail, which cannot be repaired, but can only be replaced with a new one. However, all the above disadvantages of the PDM 25-2 micromotor are compensated by its low price.

Much more reliable and functional, but also more expensive are micromotors manufactured under trademarks Marathon and Strong. Along with high power (65 W), such micromotors are able to provide high speed rotation of the tool used for carving (up to 30,000 rpm). Many experienced woodcarvers, who are already well versed in the equipment presented on the domestic market, choose micromotors of these brands to equip their workshops.

Micromotors, regardless of their modification, are not intended for use with large tools, which can quickly render them unusable.

Mini drills or compact drills with flexible drive

Mini drills or engravers for woodworking, equipped with a compact drive, sleeve and comfortable working head, are represented on the domestic market by products from different manufacturers. You can consider the possibilities of such equipment using the example of a Chinese-made Hammer MD 135A model drill, which is popular with those who are engaged in woodcarving. At a low cost, the mini-drill of this model has decent characteristics and comes in a good package, which includes:

compact drive unit;
flexible shaft;
telescopic rod designed to mount the device;
a set of 40 working tools.

Speaking of the main technical specifications drills of this model, they are impressive: the rotation speed of the tool is 10,000–32,000 rpm, the power of the device is 135 watts. It should also be noted high quality the assembly of this drill, as well as the ergonomic shape of its body and the flexible shaft nozzle, which are comfortable to hold in the hands during processing. When turned on, the Hammer MD 135A engraver for wood carving does not make much noise and does not vibrate.

To expand the functionality of the Hammer MD 135A drill, it is enough to purchase additional set working tools of various types. In the process of running in the drill of this model, which is performed at idle, you can pay attention to the fact that the revolutions of the device “float”. When the Hammer MD 135A mini drill is under load, no such problems are found.

The working tools included in the standard set of a drill of this brand can be divided into several categories:

cylindrical tools with abrasive working surface, which are used to perform grinding work;
milling cutters, with the help of which they perform sampling and grinding of the treated surface;
cutters, on the head of which an abrasive coating is applied.

If we analyze the reviews of those who have already worked with the Hammer MD 135A drill for some time, we can draw the following conclusions about its most significant virtues and shortcomings.

The reliability and functionality of the mini-drill are at a fairly high level.
The Hammer MD 135A drill can be successfully used both for making shallow grooves and for grinding surfaces with a complex configuration.
The price of this mini drill is low for equipment of this level.
Collet clamp Drills, although highly reliable, are not very convenient to use.
There are not so many nozzles that come standard with the equipment, and their quality and durability leave much to be desired.

To perform complex and voluminous work on wood and its processing hard rock you should choose more powerful drills equipped with cam rather than collet clamping mechanisms, and also use a quality tool.

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