Let's make a simple fan.
You will need:
1. 3V motor
2. Section for 2 batteries of 1.5 V each. I bought it from the CHIP and DIP store.
3. Switch.
4. Wire 15 cm.
5. Reels from fishing line or ropes, a jar from Polysorb, a jar of gouache.
6. Impeller from the power supply cooler.
7. Soldering iron.
8. Thermal gun.
9. Self-tapping screws 11 pcs. 2 cm long.

1. Take spools of thread with a diameter of 5 mm and a height of 4.5 cm - from fishing line or cord.
Mark the hole for the switch with a marker and use nail scissors to cut the hole slightly smaller size switch and insert the switch into the reel:

2. Now we form the fan frame: put 3 bobbins together and mark four holes for bolts or screws with a marker on the bottom of the upper bobbins. We burn holes through the edges of two bobbins:

3. Using a lighter, melt and clear the red wire from the section with batteries and attach it to one terminal of the switch, and to the other - the second red wire. To isolate the terminals from contact with each other, fill them with hot glue:

4. We attach the red wire to the plus + of the engine, and the black wire, respectively, to the minus - of the engine:

5. The top can be made from a gouache box: on the lid with a soldering iron we form a hole for the wires and 3 holes for the screws. And on the box itself we cut a hole with nail scissors slightly smaller than the diameter of the engine and place it inside. As in the case of the switch, you can pour hot glue on the outside for reliability.

6. We place the impeller from the cooler on the plug, fill the voids with plasticine or fill it with paraffin, use a screw or an awl to make a hole in the plug, fill it with epoxy glue or hot melt glue, and place it on the engine. If this epoxy resin- leave it to dry for a day and only then turn it on!

You are sitting at the computer, it’s summer outside, there is no air conditioning. My hand is already tired of endlessly fanning myself with newspaper, and sweat from my forehead is dripping onto the keyboard. Common situation? If you don’t have extra money, a homemade fan will help. To make it, you don't need to run to the store for parts. Everything you need for a leaf blower is in the house. Don't know how to make a free fan at home? Follow the text!

What does an air cooler consist of:

• engine
• fan blades
• stand
• power supply

The last point can be omitted if you do USB fan with your own hands. The computer has a voltage of 5 volts. You will need a printer cable, an old mouse, or any unnecessary device with a USB cable.

If you are a fan of DIY projects, you probably have some useful junk in your house. Otherwise, you have no need to know how to make a fan yourself.

Can't find an electric motor in a box of unwanted parts? You can make a fan from a motor from an old disk drive or a broken toy. Let's look at a few examples of how to make a mini fan from scrap materials.

Glue, cardboard, toy motor

To make a small propeller you will need a piece of corrugated cardboard 30x30 cm.

We glue the support in 2-3 layers, the area is at least two palms. We make the rack for the engine in the form of a prism 10–15 cm high. For cutting, we use a stationery knife. We bend the structure along a ruler.

How to make a mini fan durable and stable? Let's use a glue gun. No other glue will allow the connection to be made as reliably.

We connect with hot glue, and as thickly as possible: the structure should turn out to be monolithic. The blades can be made from thinner cardboard. The packaging for a mobile phone accessory is suitable.

This is the most critical element: the blades must be absolutely identical in shape and weight. Otherwise, your propeller will vibrate during operation and will quickly fall apart.

We glue the blades (carefully) onto a cardboard sleeve, observing aerodynamics. The planes should be rotated 30–45 degrees in opposite directions. To simplify the design, we assemble a USB fan with two blades with our own hands. They are easier to balance, and such a propeller can cope with cooling no worse than a three-bladed one.

Test run and balancing

We make a hole in the very center of the bushing (using an awl), place it on the motor axis, and carry out a test run. Of course, before assembly it is necessary to coordinate the angle of attack of the blades with the direction of rotation of the motor. Otherwise the fan will blow reverse side. If there is vibration, the propeller can be easily balanced by simply lifting the blades. After making sure that the propeller rotates smoothly and blows where required, we glue the motor onto the stand. Don't spare glue!

We connect the USB cable to the power wires of the engine. Of course, it is better to do this with a soldering iron, but given the meager power, you can get by with simple twisting. The main thing is not to forget to insulate the connection using electrical tape or tape.

How to determine the power pins of a USB cable

Any USB connector consists of 4 pins. We are not interested in averages, these are information wires. The 5 volt power supply is on the outermost contacts. Wiring in the illustration:

If you reverse the polarity, nothing bad will happen. The motor will just spin in the wrong direction. How to determine the motor supply voltage? There is no need to look for markings. If the toy (where it was installed) is powered by three batteries (1.5 volts each), then the motor is 5 volts. If it runs on two batteries, it will not be suitable for USB power.

CD

Don't know how to make an efficient CD fan? It's easier than it seems. We divide the disk into 8 sectors. An even number of blades is easier to balance if axial runout occurs.

We cut out the blades with ordinary scissors. You can do this job using construction knife, or melt the sectors with a soldering iron - there is no big difference. If you accidentally break a CD, get a new one.

The extra segments are broken out, the rest are given the aerodynamic shape of a propeller. To do this, just heat the workpiece over a candle or using a hair dryer. If you make a mistake with the geometry, you can always correct the situation by reheating. This is the advantage of crafts made from a CD.

In the center of the structure we glue a thickening: any piece of plastic 5–10 mm. We drill a hole in it for mounting on the electric motor shaft.

Where to get an electric motor

This design uses a drive from a floppy drive. Power supply is 5 volts, speed is moderate. Most likely, you do not have a separate disk drive collecting dust on a shelf; it can be found in the system unit. Nobody uses floppy disks anyway, you can safely disassemble it for spare parts.

The convenient flat motor housing allows you to assemble the fan on a flexible leg. To do this, twist a piece of single-core copper wire into a pigtail and attach it to the power cable using electrical tape.

The motor with the propeller is glued to the flexible stand either with hot glue or wrapped with the same electrical tape. Unless you're entering a fan design competition, you don't have to worry about aesthetics.

After spending 2–3 hours, you get a convenient, portable “device” that can be installed anywhere without leaving your computer.

Aesthetics from a plastic bottle

If you want not only fresh air, and to make the product pleasing to the eye, we use other materials. The basic components remain the same: a motor from a children's toy and an old USB cord. By the way, you can connect such a fan to a 220 volt outlet using Charger for a smartphone (with the same USB port).

The highlight of the design is the body. The propeller is made from a plastic bottle. The twisted plug will serve as an axial bushing. The stand can be made from a bunch of cocktail straws.

We assemble the elegant base from a second PET bottle and a CD glued to the bottom. If you have free components, you can install a connector and a switch.

Despite the “lightness” of the design, the fan turned out to be quite stable. If necessary, you can put some weight in the body.

Use of factory parts

Let's return to the presence of conditionally unnecessary computer components in the home workshop. For example, a cooler from a power supply or system unit.

The electrical part of the work is reduced to a minimum. If the power is 5 volts, we work according to the scheme: USB cable. To supply 12 volts you will have to look for a power supply or a phone charger. In addition, there are “turbines” that are connected to a 220 volt network.

Actually, to make a fan from a computer cooler, you just need to fix it on some kind of stand. And if you use batteries instead of a USB cord, the flow of fresh air can be organized anywhere.

Video on the topic

Good day Dear friends! In today's article I would like to show you a rather relevant and interesting idea homemade products. IN lately Because of the hot summer, it has become popular to make a variety of “air conditioners.” But you need to tinker with them a lot and look for components, and so it was decided to make a simple desktop USB fan. This homemade product will not cool the room, but will circulate air near your workplace, thereby giving that same “cooling effect”. In general, the homemade product is very simple and interesting, so let’s not waste time, let’s go!

So, for a desktop USB fan we need:
- DVD disc.
- Cover from plastic cover.
- Electric motor DC 5V.
- USB cable (which can be cut from an old computer mouse).
- A small wooden block.
- Wooden flat square for the base.
- Self-tapping screw.
- Plastic tie.

Tools you will also need:
- Stationery knife.
- Shilo.
- Marker.
- Super glue.
- Compass.
- Ruler.
- Scissors.
- Lighter or matches.
- Heat shrink.
- Hacksaw for metal.
- Electrical tape.
- Sandpaper.
- Drill.
- Screwdriver.
- Dye.

First we need to make a propeller for the fan. For the propeller we will need an old DVD disc. First, take the disk and use a utility knife to separate it into two parts. This is not difficult, you just need to press the sharp end of a stationery knife onto the rim of the disk, as this is shown in the photo below, and the disk itself will begin to delaminate. We will need the transparent half of the disk

Then take the lid from plastic bottle similar to the one shown in the photo below. Turning the plastic cover over, we find the center, and in the center, using an awl, we should make a through hole with a diameter equal to the diameter of the shaft of the electric motor you took.

Then, taking a utility knife, we cut out the walls from the plastic cover so that we get a flat plastic circle. The newly cut circle should be glued to the half with superglue DVD disc, which was prepared earlier.

For the next step we will need a compass and a marker. Using a compass, draw a circle with a diameter of approximately 10 cm. Then divide the circle that you drew into 6 equal segments and, using a marker and a ruler, draw dividing lines through the center. And after which we should draw the blades as shown in the photo below. If suddenly you can’t do this, then you can choose and download one of the many templates from the Internet, and if you don’t have a printer at home, then you can simply attach half of the disk to the monitor and redraw the template since, since the disk is transparent, you should definitely succeed .

As you probably already guessed, the next step is to cut out the propeller. You should cut it with the most ordinary household scissors, since the plastic is soft and does not crack; you won’t have any problems.

After cutting out the propeller we need to smooth out the edges. To do this, we need matches or a lighter; we just briefly bring the burning flame to the propeller. At this stage, the most important thing is not to overheat the workpiece as it may narrow and bend.

It is clear that the propeller at this stage will not drive air since it is completely flat. In order to bend the blades, they should be heated with a burning flame and manually bent in the direction shown in the photo below, but be careful as you can easily get burned by the hot plastic. I do not recommend using a hair dryer because its stream is too wide for our purposes.

For the next step, we need an electric motor and any USB cable; the author of this homemade product took a wire from an old mouse as a USB cable. We cut off the wire from the mouse and see that there are four more wires inside; in this case, we will need a white and a red wire, and cut off the other two so that they do not interfere. We connect the electric motor with a USB cable, observing the polarity so that the electric motor rotates in the same direction as in the photo. The author decided not to use a soldering iron to connect the wires and decided to use heat shrink.

Next, we will make a fan stand, for which we will need wooden slats, on which we mark and cut off the ends as in the photo below. After that, we need to make a groove in this workpiece in order to lay a USB cable in it. To do this, we use a stationery knife and, using pressing movements, cut out and dig out a groove. And after which the groove itself should be treated with medium-grit sandpaper.

We make non-through holes in the indicated places. The lower hole is for attaching the stand to the platform, and the upper hole is for attaching the electric motor.

Next, we’ll take a platform on which everything will be mounted, and on it we’ll find the middle and drill a through hole in the middle. Then we connect the two wooden blanks using glue and one screw.

The next step is to paint the blanks in the colors you like.

It is very hot in the southern regions; nothing will prevent you from acquiring such a “super-powerful” portable fan.

You can take an 18-volt electric drill motor, an RC airplane propeller, and a laptop battery. 4 volts is best option, besides, it is not too noisy during operation. At 12 volts, the device will be super powerful, loud, and will "rattle" (via vibration) on the table.

Required components
The motor and batteries are the most expensive parts. You can buy a cheap used drill with a bad battery and just use the motor. Used laptop batteries usually have 6 cells and will not work if one cell is dead. You can buy these batteries for next to nothing and take the working cells to make a powerful battery (http://www.instructables.com/id/Free-lithium-Ion-Battery-Pack).

Required parts:

• electric motor direct current electric drills;
• laptop battery;
• plastic fan blades;
• 1/8" plywood;
• plywood and 2x1" blocks for engine mounting;
• switch (in our case, 2P2T switch for 2 speeds); - electrical cable.

Checking the engine and batteries
Secure the motor and fan to something solid.
You can try applying different voltages to it to adjust the desired wind strength. In our case, for a 4-volt battery, the ideal current was 1.5A. An 8-volt battery for good power corresponds to a current of 3A.
Use 4 batteries, 4 parallel 4V and 2 sets of 2 parallel 8V batteries. So on low power They will last about 5 hours, and on high power for about 1.5 hours.
Connect the 2P2T wires with a switch to switch between series and parallel circuits.

Creating an air duct and mounting the engine
First, glue the 2x1” pieces together to form a T. Measure the pieces to give the propeller about a half inch of clearance on each side.
After gluing the bars, round their edges to make them streamlined.
To mount the engine, cut 2 triangles out of wood. Soak a piece of 1/8" plywood in water, then bend it and let it dry. You can cut 3 3.5" strips of wood grain perpendicular to the piece to make it easier to bend. Use timbers held together in a T as a base and cover it with 3 pieces of plywood, overlapping the joints and leaving one joint. Then glue the 3 ends of the T to the duct plywood. It is also important to try on the engine mount to make sure there is enough clearance.
Then cut two pieces of 1/4" plywood about 4.5 x 1.5 to form the duct support at the top. Glue these supports to the duct and to the "T".

Glue a piece of wood to the "T" to stop the motor from sliding backwards as the motor pushes the air forward and the motor then pushes back.
To secure the motor from below, you can use 2 zip ties.

Battery layout
Use a 6-cell laptop battery to power the fan. For a bicycle fan in motion, you need a 12V fan. As a desk fan, 4V or 8V is more than enough.

Wires to the motor
Solder two 14 gauge wires to the motor. Insulate with electrical tape. To prevent wires from getting caught in the blades, secure them to the fan support.

Testing
Power the motor in parallel with 2 sets of 3 combined cells. The voltage should be about 11.8 V. Even the multimeter should show 3.38 A. The multimeter has some resistance, so the current is actually about 4A. More than 47 W. This is already a very powerful little fan. At 16 V, this fan can already push a bike decently.

Installation of protection
The propeller rotates too quickly, so protection will need to be installed.
Using wire cutters, cut a circle from the large fan guard so that its radius is about half an inch larger than the duct. Loop the wire around the duct. Then hot glue the protection to the front and back.

Switch installation
Install the switch. The fan can now be turned on and off easily. You can use a 2T2P switch and get two rotation speeds.

Sitting at the computer in summer time many people begin to suffocate from the heat; it’s good if there is air conditioning, but it’s not always convenient to turn it on. In this article we will tell you how to make a USB fan with your own hands, from a motor, a cooler and a small engine. We will show you the manufacturing process and step by step instructions, we will highlight two of the simplest and most effective methods.

Making a fan using a computer cooler

To make a fan at home and not have to strain at all, we found this method on the Internet. The entire manufacturing process will take no more than 20 minutes, you can use old coolers or just buy a new one in the store, the price for them is now a pittance.

First we begin to prepare the cooler, it has two wires: red and black. We remove 10 mm of insulation from each wire; there is even an insulation stripper. The size of the cooler does not play a special role; of course, it is better if it is big size, the wind flow will eventually be stronger.

We begin preparing the USB wire; to do this, cut off one half at the main cut and remove all the insulation. We will get four wires: two black and two red, we also strip them. If there are other green or green wires on the cooler white we cut them off, they just get in the way. Learn how to make a thermoelectric generator with your own hands.

In the end result, you need to connect the wires to each other, there may be several ways, the main thing to remember is color coding. Don’t forget to isolate everything from each other, the more isolation, the better. For convenience, the finished cooler can be installed in a regular shoe box, so it will be more stable.

This is how the guys in the video suggest we make a fan from a cooler. The method is actually simple, we don’t promise strong airflow, but working at the computer will be much more pleasant.

How to make a USB fan with your own hands using a motor

So, to make a fan from a disk motor and a usb, we will need more time, but this type of fan will look better. Anyone can make such a device, the main thing is to show a little desire and patience.

First of all we need to make the blades for our fan, we recommend using a regular CD drive, it looks great and is quite easy to make. Also read interesting article, where we make laser levels.

Here are the guys with the video showing a really cool method. In a similar way, you can make a fan out of paper, but remember, the paper must be thick; it is optimal to use cardboard.