How to make a simple but powerful boron machine (drill)

Hello Everyone. If you wanted to build a drill with their own hands at home, then you’ve come to the right place. In this article we will consider the process of creating a trimmer, which will be an indispensable assistant in the manufacture of any self-made. There is a video at the end of the article, which clearly shows the entire mowing process.

Such a drill can work well with materials such as: Fiberboard, wood, plywood, plastics, soft metals. In general, this tool can do the same thing, as well as regular factory drill.

Mini drill with their own hands

The basis of a homemade mini drill will serve as a motor from an old hairdryer, and as the body will be used by packaging (plastic tube) from the vitamins.

A little about the engine. Using the motor from tape recorders, as recommended by some craftsmen is extremely undesirable. It has clearly insufficient power for comfortable work mini drill. On the motor we used the Mabuchi Motor RS-365SD-2275 exact datasheet could not be found (apparently discontinued), but some forums found information that he works at 6-20 V (starts from 3 V), and the number of maximum speed is different sources is 12000-18000 rpm. With this motor you can not only drill plastic and textolite, but also grind or cut thin metal if you want.

Let’s proceed to preparing the body. Let’s cut the bottom of our tube and prepare a rubber plug for the hole (ideally a leg from an old computer system). Then in this plug we make a hole for the power connector and the reverse switch.

On the back side press our motor. Landing occurs very tightly and reliably, there is no need to fix the motor in the housing additionally.

mini, drill, their, hands, very, powerful

A lot of variants can be used as a mini drill speed regulator scheme. We took the simplest circuit on a single transistor.

It has a lot of disadvantages, but its only advantage is that it is simple, works without previous dancing with diamonds and fits easily into our small housing. The circuit can be mounted hinged, and the transistor must be mounted on a good heat sink. The transistor is better to take a bigger one, for example KT837, or better still KT825 (or other not less powerful analogue).

When the motor works, a small air flow is created from the back of the motor. Thanks to this you can put a heat sink with a transistor behind the motor, it will improve its temperature.

A little about reverse. Is it necessary to reverse the mini drill? Undoubtedly this function will be useful, but it is not the main one, and you can do without it if you want. To realize the reverse we used a simple circuit on a six-pin switch.

Fix a variable resistor speed regulator, install a rubber plug with a power connector and a reverse switch.

It remains to install the collet chuck and mini drill with their own hands ready.

To power such a homemade mini drill can take a power supply with a voltage of 15-18 V and a current of a couple of amps.

For the first time and for the tests was chosen a unit of 15 V; 0.4 A.

Mini drill with such a power supply works, but its output at a heavy load is a little bit not enough. Perhaps in the future it will be powered from a small laptop power supply.

And the final video demonstration of the homemade mini drill.

Economical version without housing

The most budget model of the mini drill is a regular electric motor, to which the power unit is connected through the wiring without a housing. For 12-volt motor you need power supply consisting of a 30-watt transformer and a rectifier bridge, for example, on the diode 1N1007.

To protect the motor from the pulsating oscillations of the winding in the rectified voltage allows inclusion in the circuit a simple capacitor, up to 25 V with a capacitive characteristic of 1000 microfarads.

The circuit works reliably, but with increasing load, for example, drilling out dense material, the voltage will drop, leading to a stop rotation. The voltage can be stabilized by adding stabilizers to the KR142EN8B or L7812CV circuit

Once the drive unit is ready, you make or buy a chuck. for home drilling miniature holes may even fit a rod from a pen, which is fixed with glue drill. The chuck can also be replaced by the previously suggested collet or screw terminal.

Full analog of the factory-made dremel

The first thing you need to construct a mini drill is a miniature 5 to 12 volt electric motor. These can be found in children’s and decorative toys, old cassette players, printers or portable fans. Many stores sell them in the electronics and modeling section, including online stores.

Drill example

The original case is also made by yourself so that the motor is tightly fixed inside, while leaving a gap or open part in the place of heating.

The body of the mini drill can be any plastic tube.

You can see models that use a tube of sealant, a syringe, a plastic tube of toothpaste or candy for children.

Will also file to the right length of a piece of sanitary plastic pipe, but in this case, the open ends will need to plug any movable “stopper”, such as acrylic or cut out of plastic.

The chuck or clamp of the mini drill can be made by yourself, for example, from an ordinary connecting terminal, or bought at the market or in a store. For collets, you can go to print shops, as well as in the department for modeling or the accessories section for household power tools.

The resulting tool is a universal option; depending on the type of repair, various attachments are fixed with such a clamping chuck: drills, cutters, discs with a cutting edge or screwdriver heads.

Engine from a car stereo: assembly

After you have the materials you need to get hold of a soldering iron, solder, rosin and wires. This is needed to connect the drill. It is also recommended to find or buy glue to secure the elements of the drill more securely.

The next step is to insert the drill bit into the collet and secure it. This is especially important if it is difficult or impossible to change the drill in the collet after it has been mounted on the motor shaft. Usually motors from car radios have a shaft diameter of 1.5 to 2.5 mm, so the fixing hole in the collet must be within this range. If there will be backlashes during fixing, the drill will vibrate in the process, which can cause displacement of the drill and, as a result, the hole in the wrong place. It will be quite difficult to eliminate vibration in the process.

Next, the finished design should be installed in the selected enclosure and fastened there. Adhesive can be used to secure the mount, but it is recommended that it be spot glued to the surfaces of the housing or motor.

Important moment. During installation, the polarity of the motor inputs should be reversed. This can be done either by wires when connected to the power supply, or by turning the battery itself (if batteries are used). The second variant is most convenient and fast realized in the case if the body of the drill is the case from a flashlight. Changing the polarity is necessary to reverse the motor, this may be necessary to remove the drill.

If vibrations occur in the process of work, they should be eliminated. To do this, you can use improvised materials that are used as a gasket between the motor and the body. They should be mounted on glue to avoid them shifting or falling out. For reliable fixation of the motor in the case it is recommended to use fiberglass. The easiest way to get the pieces of fiberglass from the disk box (the transparent one) is to carefully saw out the pieces of the right size.

As you can see from the above description, the technology of making a homemade low-power drill is quite simple and is made quickly with all the necessary elements. The main disadvantage of such a drill will be the use of thin drills, which can break or get stuck in the surface to be drilled.

Handmade Mini Drill

All handmade mini drill that you can make yourself can be divided into electric (driven by an electric motor) and handheld mini drill (rotated manually). The first option has significant advantages due to autonomous operation, but at the same time, you need both a motor and a power source for it. The second version of the mini drill requires neither power nor an electric motor, so it is much easier to make if you have all the necessary materials. After choosing which type suits you best, you can proceed to making it.


Note right away that this is exactly a reduced version of the classic device for drilling, so the work that can be performed with a mini drill is limited to plastic, circuit boards, plywood, soft wood. Work on steel workpieces and concrete it can not, so the power of the device is relatively small.

What you need for an electric mini drill?

mini, drill, their, hands, very, powerful

Each of us at home can find a huge number of hand tools, which no longer use, but they can still be used to create a mini drill.

To assemble such a tool yourself you will need:

  • A small motor. this is the most important part, as its parameters will directly depend on the capabilities of the mini-drill. The most suitable variants are engines from old hairdryers. they have good enough power and the number of revolutions from 1000 to 1800 rpm, and the hairdryers themselves are often sent to the category of junk even with a working engine. Also well suited motor from a blender or mixer (from them you can leave the body), from a tape recorder and children’s toys motors are less powerful, but for the mini drill is quite suitable.
  • Power source. depending on the type of device, the motor can be powered from either 220VAC or 6VDC undervoltage. In the first case it is enough to plug it into a socket through the power cord. If the motor runs on DC with a rated voltage of 3, 6, 12 V, you need a power adapter with conversion to the appropriate level or a few batteries.
  • Chuck. as a chuck for the mini drill is ideal for a native element of a failed electric screwdriver or a small drill. But not everyone can afford such luxury, so the universal option is considered a collet. a part for clamping round elements or a homemade sleeve made of metal tubing with bolt clamps.

Important parameter for the collet is the inside diameter. it must fit the diameter of the motor shaft exactly. If the collet is smaller in diameter, it will simply not fit on the shaft, if it is too large, it will wobble, which will affect the drilling process. Therefore, before purchasing a specific model, measure the shaft, usually it is 1.5 or 2.3 mm, but the value can vary.

  • Housing. the main function of the housing is to protect both the device itself from fouling and the effects of external factors, as well as the person, by isolating the electrical part of the mini drill from the hands. So plastic parts such as deodorant bottles, plastic water pipes, casings from old lanterns and other things work well as mini drill bodies. The issue of insulation is particularly relevant for devices powered by 220 V, if the drill is powered from a safe low voltage to 42 VAC and 110 VDC, the housing can be made from metal pipes, cylinders, etc.д. Fig. 3: the body from a syringe
  • Connecting wires. selected according to the load, but due to the small amperage of the motor, you can choose insulated brands with a small cross section. To solder them, you will need a soldering iron and a soldering iron or a dad-mom connectors. The second option is useful in situations where you need to reverse the mini-drill.
  • Drill bit and other attachments. are installed in the collet, if you want you can replace the drill bit with a mill, etc.д. Choose according to the diameter of the collet hole.

Most of the parts you can find at home, but if you can’t find the chuck, you’d better buy a collet or get a bushing from a turner. Do not solder the drill directly to the shaft, as some “craftsmen” advise. Such a mount can easily fail long before the first mini-drill job is completed.

Assembly of an electric mini drill.

Choose a dry place for assembly, so that no moisture can get inside the device at this stage. Because water or condensation can damage your drill when you turn it on or electrocute it. The whole process is conditionally divided into several stages, observing which you will get a mini drill, not particularly different in parameters from the factory products:

  • Solder two wires to the electric motor pins (if you did not leave them from the previous product). For DC models, it is important to observe the polarity, so it is better to mark the wires with different colors for convenience. Fig. 4: solder the wires to the motor
  • Solder a button to the motor start. not necessary but handy enough if you intend to use the mini-drill for a long time. Fig. 5: push-button for electric drill
  • Clamp the drill bit in the collet or sleeve, depending on the chuck design, it must be clamped so tight that it cannot be turned by hand. Fig. 6: insert drill bit
  • Place the ready-assembled chuck onto the motor shaft, as deep as possible. But make sure that the chuck itself does not touch the motor housing when rotating, there must be a gap of at least 2. 3 mm between them. Because at high revolutions it can loosen and cling to the motor housing, which over time can break the motor. Fig. 7: Slide the chuck onto the motor
  • Screw the chuck onto the shaft. Note, the tightening should be carried out alternately on the same number of rotations of each bolt. If during tightening you find that one or more of the bolts are no longer pulling, let go of the previous ones to equalize them. In case of displacement of the head relative to the shaft, the drill bit and the mini drill itself will come apart during drilling. Rice. 8: order of tightening the chuck
  • Mini drill ready, connect the device to the mains or battery and try to start. Fig. 9: Connect the power supply

From a fishing reel

A simple and effective drill can be built using the spool mechanism of a fishing rod as the drive. Such a tool would work like a drill, with the torque of the handle transmitted through a toothed gear.

From the master will only need to dismantle the fishing bobbin spool and undercut the axis, then in their place to weld or glue a collet or chuck from a non-working drill, in which the drill will be fixed.

The model is mechanically driven, requires no power, and is powered by hand.

Toothbrush-based mini drill

Electric toothbrushes are very convenient to use. However, they are impractical because there is no way to change the bristles on them when they wear out. In addition, the disadvantage of such devices is that the electric toothbrush is quite expensive. That’s why you have to get rid of it after it is completely worn out. But it is not necessary to send this expensive device to the trash when it becomes completely unusable for brushing teeth. You can use the body of an electric brush to make a compact drill.

  • The first thing to do is to take an old electric toothbrush and saw it all the way down to the housing. Next, you need to connect the motor shaft to the drill, which uses a collet clamp.
  • When buying a collet clamp, you must find out in advance the diameter of the motor shaft. The motors that are installed in toothbrushes differ from each other in the diameter of the shaft to be put on.
  • Purchasing a collet clamp does not require you to spend a lot of money. It can easily be bought at a flea market or in a specialized store on the Internet. This fixture includes a chuck, interchangeable drill bits of various diameters, which are inserted into the chuck.
  • In the manufacture of a compact drill from a toothbrush the most difficult moment is to put the collet clamp on the brush motor. The chuck is designed for a shaft starting at 2 mm, and the motor may have a smaller size. Then you have to perform a rather complicated manipulation. to grind each screw of the fastener to give it a tapered shape. In this case it will be possible to adjust the minimum diameter of attachment cartridge to the diameter of the shaft of the motor.

Of course, it is possible to assemble a compact drill using more than just a brush or an old handle as the basis. Other devices will also be suitable. Craftsmen are constantly inventing other ways to assemble a compact tool with their own hands from improvised materials. If you need a drill, you can assemble it using the options that were proposed in this article. Even if you have no experience in such work, you can easily cope with the task at hand and get at your disposal a tool for drilling holes.

The process of making a compact drill from improvised materials is quite simple. Just put some effort and spend a little time, and you will have a good replacement for an ordinary drill. With self-made compact tool you will be able to drill holes for repairing furniture and other household problems.

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