How to demagnetize instruments at home?

Home/Articles/Magnetize and demagnetize a screwdriver

Screwdrivers with a magnetic head are very convenient, because be that as it may, the main task of a screwdriver is to tighten or unscrew bolts and screws. They can be very small, so it is not always convenient to hold them yourself. And if the magnetic head takes on your responsibility, this will greatly facilitate the achievement of the goal and the work in general.

But what to do if you only have ordinary screwdrivers at home, but you need to fasten a lot of bolts? In this case, you can magnetize and demagnetize the screwdriver yourself, without much difficulty.

How to demagnetize an electricity meter after a magnet

In order to avoid a fine, you must make sure that the water meter is demagnetized.

There are 2 methods of demagnetization:

1. Using a powerful electromagnet. Bring the device to the meter and turn it in different directions. Make sure that after removing the device the plastic blades work properly and do not stop.
2. Using a magnet to remove residual magnetism. Attach the magnet to the drill bit, and then spin the device next to the meter. Rotational movements should neutralize accumulated magnetism.

1. Replace the meter and that's it. Just throw out the faulty one. It will be cheaper than the amount of the fine issued. And for the future, don’t use neodymium magnets to stop the counter, just a small magnet from a small speaker? And anyway, stealing (even from thieves) is bad.
2. Why does he stop?
   There are gears in the drum of the counting mechanism; the magnet causes them to warp and jam. To remove their stopper, try knocking on the body (just not hard), move the magnet in circles, maybe you will find the right point where you will release it. Do all actions with the water turned off, so that they don’t bite under load.
3. Rather, it was not magnetized, but rather the impeller was clogged with rust and other components of clean drinking water.
4. Give the water the opposite way, it might get dirty
5. You can try a demagnetization loop.

I took the kinescope demagnetization loop: I folded it once: And I folded it twice: As a result, we get a demagnetizer coil that is already ready for use.

But due to the small working area and strong heating, I connected another loop in series: In order not to burn the coil or forget to turn it off, we connect the whole thing through a push-button and a fuse: Such a coil is good for demagnetizing a large tool, but use it for demagnetizing drills and taps will be inconvenient, so I made the second option - small and neat. In this version, I used a solenoid from a reel-to-reel tape recorder connected through a transformer.

If an inspector knocks on the attacker’s door, the attacker simply removes the magnet. What are the consequences of installing a magnet on a water or electricity meter in 2022? Additionally, utility employees will recalculate the amount of water or electricity used based on average indicators.

We invite you to read: How electricity charges are calculated

The punishment in this case is fair - you will need to contribute money to account for what the electricity suppliers did not receive.

• Homemade demagnetizer or how to demagnetize a tool
• What to do if the water meter breaks due to neodymium magnets?
• How to remove magnetization from a meter
• Magnet for water meter
• How to remove residual magnetization from an electric or gas meter?

How to remove residual magnetization from an electric or gas meter?

• How to remove magnetization from a water meter
• Payment for water Illegal use of magnets for meters is punishable!

• CYBERNET Forum
• How to demagnetize an electric meter after a magnet
• How to remove magnetization from a water meter Illegal use of magnets for meters is punishable! Anti-magnetic control seals on the protection of water and electricity meters!

Vladimirs Vorohobovs Buy a neodymium magnet for a water meter in Ukraine How to remove magnetization from the meter? Select your region

CYBERNET Forum walentin wrote: QUESTION. Can I prove to them that there was no magnet through the court or can they prove with their Expertise that there was a magnet. Or it’s cheaper to pay 3000 UAH. LEO counter type Nik 2102 Well, there was a magnet.

How to make a degausser with your own hands

Fig.2. Transformer movements when demagnetizing an object (screwdriver)

To the current network

Fig.1. Electromagnet design

To demagnetize the instrument, the device is plugged in and slowly brought towards the instrument in a circular motion. Without interrupting the circular movements, they are slowly carried away from the instrument to a distance of I - 1.5 m. This completes the process. If the tool is strongly magnetized, the cycle must be repeated.

Stuff the W-shaped plates into the coil frame so that the magnetic circuit is open (Fig. 1). Connect the mains winding of the transformer to the network. The device is ready for use.

Bring the transformer to the object requiring demagnetization, as shown in Fig. 2. Move the transformer evenly over the part for a few seconds, then, performing circular movements with the transformer, move it away from the part and turn off the current. The part is demagnetized.

The magnetic core of the transformer can be restored and the transformer can be used for its intended purpose. The electromagnet from the Moscow-5 electric razor is very convenient for demagnetization, since it does not require modification.

Turko S.I., Bryansk

The device for demagnetizing a tool is an ordinary electromagnet operating from an alternating current network. On the magnet coil frame (Fig.

1), made of fiberglass laminate (textolite) with a thickness of 1.5 - 2 mm, a winding consisting of 1680 turns of PEV-2 with a diameter of 0.35 - 0.38 mm is wound turn to turn. Each row of winding is wrapped with 1 - 2 layers of capacitor paper.

The core is assembled from transformer steel plates measuring 20x70 mm. The plates can be cut from steel from the core of a suitable power transformer.

Fig.2. Protective cover

The demagnetization cycle lasts no more than 15 - 20 s, but even in such a short period of time the inductor gets very hot, and for safety reasons it must be placed in a plastic case with holes for cooling (Fig. 2).

A device for demagnetizing metal objects can be easily made from the choke of a ballast for a fluorescent lamp (a device from a lamp with a power of at least 80 W is suitable). The throttle casing is disassembled and all external parts of the magnetic circuit are removed (the core is left).

The outer secondary winding (if any) is usually removed, but you can leave it in place, securely insulating its ends. The primary winding is connected to an alternating current network and demagnetization is carried out slowly in a circular motion, first bringing the object to the magnet and then moving it away.

Continuous operation of the magnet is no more than 30 s.

Read also: Correct cutting machine and 6122 adjustment of the length of segments

how to do it yourself

When demagnetizing the kinescope, rainbow circles are visible

A degaussing device can be made from a choke from an old fluorescent lamp. You need to remove the outer metal casing from the inductor, leaving the winding and inner core. Then solder a power wire to the winding with a connected plug for a 220 volt network. And wrap it with electrical tape. The result was an ordinary electromagnet with a large dispersion field.

Or you can make an electromagnet yourself (see figure). The core is assembled from 60 electrical steel plates with a thickness of 0.35 and a length of 70 mm. The winding contains 1680 turns of PEL-0, 38 for a network voltage of 220 volts or 970 turns of PEL-0, 47 for a network voltage of 127 volts.

The demagnetizing device is connected to a 220 volt network at a distance of about 1 meter from the part being demagnetized, then slowly brought almost to contact, made several circular movements and gradually removed. There is no need to keep it turned on for a long time, because... After a minute or two the winding gets very hot.

A demagnetizing choke is used to demagnetize picture tubes of televisions and monitors, metal tools (tweezers, screwdrivers, etc.), drills, bolts, screws, magnetic heads, for quickly erasing magnetic tapes, etc. and so on.

Good to know

In metallurgical plants, electromagnetic cranes can carry enormous loads. Massive blocks of iron or machine parts weighing tens of tons are carried by these cranes without any attachment. Sheet iron, wire, nails, and scrap iron are also transported without boxes or packaging.

Man has been using magnets in various areas of his life for a long time. Often we do not notice their presence in the devices around us and the additional convenience of their use. Today, the vast majority of household appliances and appliances are created using magnets.

However, many unexpected problems arise in everyday life, especially of a technical nature. It happens that you need to maintain or strengthen the effect of a particular magnet, and especially vice versa - demagnetize it. Let's dwell on the last problem - how to demagnetize permanent magnets?

After reading a selection of our practical tips, you will find out how, in what way, and whether it is possible to demagnetize “home” magnets without outside help.

Basic methods for permanent magnets

In everyday life, it is sometimes convenient to use magnetized tools, for example, a screwdriver, which will prevent the screw from falling off at the most inopportune moment and in a hard-to-reach place.

But the properties of a permanent magnet are not always useful or necessary. With the same files, drills, taps, etc. magnetized during work.

It will be obviously more difficult to work due to sticking metal filings.

In this case, there are several solutions to this problem. Let's note two of them.

Method 1. Heating to a temperature above the Curie point

The Curie point is the temperature at which the symmetry of ferromagnetic atoms is destroyed. Simply put, you take your magnetized tool and heat it up quite a lot. Strict atomic symmetry is broken, and the instrument loses its magnetic properties under the influence of heat.

Method 2 . Homemade degausser

This method will require the presence of an electromagnet operating on alternating current, in the form of any coil (hollow solenoid) designed for the existing voltage in the house. There are many reel options.

Suitable, say, is a coil from an old electromagnetic bell, a solenoid relay for a car starter, etc. The primary winding from some transformer is also suitable, especially if its frame is cylindrical. Secondary - can be wound up as unnecessary.

We place the demagnetized tool inside for a few seconds and turn on the “unit” to the AC power supply.

How to demagnetize a permanent magnet reliably, and at what voltage? There are a couple of nuances:

• When demagnetizing, first remove the tool from the coil and only then turn off the power supply. Otherwise, the metal may not be demagnetized.

If there are no mentioned solenoids (from an old coil or transformer winding), you can wind a small demagnetizer coil with your own hands. How to successfully demagnetize a permanent magnet with it? A number of parameters will need to be met:

The resistance of such a winding will be about 8 ohms if:

- the solenoid frame will be 80 mm long, with an internal diameter of 30-35 mm;

— at the edges of the frame, when winding, leave cheeks 80 mm in diameter and 5-6 mm thick;

- wrap approximately a thousand turns of PEL (or PEV) wire with a diameter of 0.7-0.9 mm around the solenoid.

For large plumbing tools, you will need a more powerful (larger diameter) demagnetizer. It can be mounted from the demagnetization loop(s) of an old picture tube.

The magnets are connected to each other - how to separate them

How to demagnetize a magnet from a magnet (disconnect), especially if they are powerful? Let us immediately make a reservation that it is useless to separate powerful magnets by simply breaking them, and you can get injured. In this case, you can also give at least two pieces of advice:

Method 1: Using diamagnetic metal sheet

1. Using a metal wedge made of some diamagnetic material (duralumin, copper, etc.), try to widen the gap between the magnets, but be careful - do not use an iron hammer (it attracts).
2. Insert a sheet (can be metal) into the gap that is larger in area than the magnets, which will serve as a guarantee that everything can come back and the magnets will attract each other again.
3. Secure the lower magnet, and begin to move the upper one until you feel that it is freed from the attraction of the lower one.

Read also: Service life of a flexible gas hose

Method 2. Using plywood

1. To separate the magnets, a sheet of thick plywood (10 mm) is used. A hole is made in it for the magnet (if it is impossible to create a gap between the magnets). This sheet will serve as a kind of stop for one of the magnets during the separation process.
2. Disconnection occurs in the same way as in the first example.

Everything described above are little tricks mainly for amateur locksmiths. And now a little about the twists and turns with magnets during shopping, which most of our lovely ladies so adore.

Shopping and magnets

Today, in the vast majority of supermarkets, special magnetic alarms are attached to goods, and sometimes it happens that a customer finds herself in an unpleasant situation after purchasing, for example, a new coat. The purchase is completed, but at the exit from the store this “stop light” still signals “theft” - the seller forgot to neutralize the sensor from the product.

Or the electronics may malfunction. Guard magnets are designed in a special way and vary depending on the product they “protect” - with visible or invisible labels (stickers), plastic clips, etc. And they are attached to clothes in different ways, and you can’t just unhook them, since when removed they can even ruin the material of the coat with paint.

But if this happens, and you come home with a working sensor, you still need to remove it from your new purchase, because the next time you go to the store wearing new clothes, it may not work in your favor.

But it is not necessary to physically remove the magnet from clothing (especially in inconvenient places).

This problem can be solved in another way; the most effective and safest way is demagnetization with a so-called neodymium (which has the highest power) disk-shaped permanent magnet with a sufficiently large working area. It is on free sale. It is enough to move this magnet over the clip, and the sensor will be demagnetized.

You can answer the question in the same way: “How to demagnetize magnets on shoes”?

Which metal is not magnetic?

How to make an electric current generator at home

Author Marina Sivtsova asked a question in the Natural Sciences section

What metal does not attract a magnet? and got the best answer

Answer from Evgeny M. Any diamagnetic materials do not attract a magnet, but rather repel it. These are, for example, diamagnetic metals such as Cu-copper, Au-gold, Zn-zinc, Hg-mercury, Ag-silver, Cd-cadmium, Zr-zirconium, etc. But paramagnetic metals, such as Aluminum, are attracted to a magnet . It’s just that when they are not in the ferromagnetic phase, such attraction is very weak and unnoticeable without instruments. A typical example is aluminum. At room temperature it is not in the ferromagnetic phase, but in the ordinary paramagnetic phase. Therefore, if you simply hold it with your hands and bring it to a magnet, you will not feel the attraction. But if you hang a piece of aluminum next to a magnet on a long thread, the thread will deviate slightly from the vertical.

As I noticed, this coin was minted at the Moscow Mint (MMD), more details.

Homemade demagnetizer or how to demagnetize a tool

Sometimes a magnetized tool is useful - for example a screwdriver, the screw will not fall off. And when a file, tap, drill, or pliers are magnetized, this is not very good, rather even very bad in terms of the adhesion of metal filings and their subsequent removal. This article will discuss the topic of how you can make a demagnetizer with your own hands and using improvised means.

How to magnetize a screwdriver without a magnetizer

As in the case of a special screwdriver, a magnetizer can become unnecessary and an unjustified waste of money and time. This is especially true in cases where the need for a magnetized screwdriver is extremely rare.

And then there is a need to find a handy way to solve the problem. There are several methods on how to magnetize a screwdriver at home without using the device described above:

Using a powerful magnet. If there is such an item, then you can bring the instrument to the desired state in a few minutes. You need to move the screwdriver from the tip to the middle with a magnet. If you always need such a tool, then after work you can leave it on the magnet.

Using an improvised reel. In cases where there is no good magnet, and you need a screwdriver right now, you can make the missing item yourself. To do this, you need to wrap a metal object with paper and varnished copper wire.

For a good result, the wire will need a lot, two to four hundred turns around the selected object. The result is a coil to which voltage must be applied. To do this, you can use a battery, batteries, charger, and so on.

Through the voltage of the household, general power supply network. The same coil is also used here, only the voltage is supplied from the outlet

An important difference is the presence of a fuse that can protect against short circuits. You should be especially careful, because the fuse will burn when connected

Each of these methods should be done following safety rules, otherwise it can cause harm to health. It is best if you do not have the appropriate skills or knowledge to seek help or advice from a person knowledgeable in this area.

Otherwise, each of these methods will be able to magnetize any metal object. The cheapness of each method should be considered individually, based on the availability of the necessary components.

Video on how to magnetize and demagnetize a tool without special equipment

How to demagnetize metal – Metalist's Handbook

Craftsmen when working with various metals are faced with a problem - magnetization of tools.

In some jobs, magnetic properties help with actions, for example, with a magnetic screwdriver you can install a screw in a hard-to-reach place.

The build-up of metal shavings when using a caliper, file or drill can interfere with marking or a straight cut line.

How to demagnetize metal at home

How to demagnetize metal at home - Metalist's Handbook

Craftsmen when working with various metals are faced with a problem - magnetization of tools.

In some jobs, magnetic properties help with actions, for example, with a magnetic screwdriver you can install a screw in a hard-to-reach place.

The build-up of metal shavings when using a caliper, file or drill can interfere with marking or a straight cut line.

How to demagnetize metal at home

How to demagnetize metal at home?

Judging by numerous reviews, when starting to carry out any work, home craftsmen often encounter one problem - magnetization of tools.

According to experts, this property of the metal in some cases significantly helps in work, since the tools become better.

For example, using a magnetized screwdriver it is much easier to tighten screws in the most difficult to reach places.

You will find information on how to demagnetize metal at home in this article.

Before you become interested in how to demagnetize metal, you should understand the nature of this phenomenon. According to experts, magnetization is carried out by paramagnets, diamagnets and ferromagnets.

Products based on alloys of iron, nickel and cobalt have their own magnetic field, which is higher than the external one. Tools become magnetized if they are used near electric motors or other emitters.

As a result, they will take away some of the magnetic properties.

How to demagnetize metal at home? — po4ki.ru — Garden, vegetable garden, dacha

Judging by numerous reviews, when starting to carry out any work, home craftsmen often encounter one problem - magnetization of tools.

According to experts, this property of the metal in some cases significantly helps in work, since the tools become better.

For example, using a magnetized screwdriver it is much easier to tighten screws in the most difficult to reach places.

You will find information on how to demagnetize metal at home in this article.

Orbital movement: charged particles in magnetic fields

Do-it-yourself electric generator: making simple and effective models at home

A positive charge placed in the electric field of a parallel-plate capacitor (see Chapter 17) will move in the direction opposite to the direction of the field lines. The fact is that these lines come out of charges that are located on the positive plate, which repels the positive charge. However, when it comes to a magnetic field, everything is different here due to the fact that the magnetic field does not act on charges moving in parallel. In Fig. Figure 18.4 shows the path of a positive charge moving perpendicular to the magnetic field lines.

Did you notice the crosses in the picture? This is how it is customary in physics to denote the direction of magnetic field lines when they are directed away from the reader and enter the page along a perpendicular to it. It is understood that the crosses indicate the ends of imaginary vector arrows, which are exactly what they look like from behind. A positive charge moves in a straight line until it enters a magnetic field and begins to be subjected to force. As can be verified using the right (or left) hand rule, the magnetic field strength will be directed upward and, as shown in the figure, will make the path of the charged particle curved.

Magnetic fields don't do work...

As you know, a force acts on a charged particle in a magnetic field, but what work does the magnetic field do on this charge? Yes, good question.

When a charge moves in an electric field, it does work with it, due to which the concept of potential difference is introduced, i.e. the work done on the charge ​\( W \)​, divided by the value of this charge ​\( q \)​ (in other words, the work done on one coulomb):

What work does the magnetic field do on the charge? It can be calculated this way (as shown in Chapter 6):

where ​\( s \)​ is the distance. So...Have you noticed yet? Here ​\( \theta \)​ is the angle between the force and the direction along which it acts. But, according to the right-hand rule, for charges in a magnetic field the angle \( \theta \) is always equal to 90°, and cos90° = 0, i.e. the work done by the magnetic field on a moving charge is zero.

...but affect moving charged particles

Despite the reluctance to deal with a moving charged particle, a magnetic field can change the direction of that particle's motion (which it does). In fact, if the direction of motion of a charge can be freely changed, then the magnetic field will always do this, since the force acting on the charge is always directed perpendicular to its movement.

Do you remember any other type of motion whose direction is always perpendicular to the applied force? Well, of course, this is the rotational motion that was discussed in Chapter 7. This movement of the charge can be seen in Fig. 18.4 as it passes through a magnetic field. Since magnetic fields act on a charge perpendicular to the direction of its movement, the movement of charges that do not go beyond the magnetic field will be rotational.

Look at fig. 18.5, where the positive charge moves to the left in the magnetic field. The margin \( \mathbf{B} \) is directed upward from the plane of the page towards the reader. How is this known? See all those dots inside the circles? Just as a cross denotes a vector arrow directed away from the reader, so a dot inside a circle denotes an arrow directed towards the reader. Therefore, now the field ​\( \mathbf{B} \)​ is directed upward, i.e. from page to reader.

So the field \( \mathbf{B} \) is directed away from the page towards the reader, and the positive charge moves to the left. Using the right (or left) hand rule, we can say that the resulting force is directed upward (more about the right hand rule earlier in this chapter). Under the influence of an upward force, the charge also moves upward. But since, due to the action of the magnetic field, the force is always perpendicular to the direction of movement, it also changes its direction. Here is the formula for the magnitude of force:

Since in this case the velocity vector \( \mathbf{v} \) is perpendicular to the magnetic induction vector \( \mathbf{B} \), then ​\( \theta \)​ = 90°, or ​\( \sin\ !\theta \)​ = 1, which means that:

Since the force is always perpendicular to the direction of motion, circular motion thus arises. In other words, it is nothing more than the centripetal force needed to provide rotational motion (Chapter 7).

where ​\( m \)​ is the mass of the particle, and ​\( r \)​ is the radius of the orbit of rotational motion. Thus we get:

From here it is easy to find the radius of the orbit of rotational motion:

Description of the experiment

So, in the experiment we observe how a permanent magnet moves inside a hollow copper pipe at a constant speed. Let's fix an arbitrary point in the body of the copper tube and mentally draw a cross section. A magnetic flux created by a permanent magnet passes through this section of the copper pipe. Due to the fact that the magnet moves along the pipe, an alternating
magnetic flux appears in the cross section of the conductor, either increasing or decreasing, depending on whether the magnet approaches or moves away from the point where we mentally drew the section. An alternating magnetic flux, according to Maxwell's equations, generates a vortex electric field, generally speaking, throughout space. However, only where there is a conductor, this electric field sets in motion the free charges located in the conductor - a circular electric current arises, which creates its own magnetic field and interacts with the magnetic field of a moving permanent magnet. Simply put, a circular electric current creates a magnetic field of the same sign as a permanent magnet, and a certain dissipative force acts on the magnet, and more specifically, a frictional force. The reader may rightly ask the question: “Friction of what against what?” Friction occurs between the magnetic field of the dipole and the conductor. Yes, this friction is not mechanical. Or rather, the bodies do not touch. Well, let! There is still friction!

In general, in words everything looks more or less smooth, but can it be described in the language of mathematics? Let's get started...

Accessories for search magnets

How to update an old cast iron bathtub at home

Thanks to proper use, transportation and storage, the search magnet will last a long time and will not lose its properties ahead of schedule. Accessories protect the unit from environmental influences and ensure efficient use and transportation.

Ropes for search magnets

Chinese cord and clothesline are the first step to failure. They only look very strong, but in practice they will break during the first dive. An “accident” will happen even if the object is too heavy or simply caught on a snag.

In order not to lose the magnet on your first “fishing”, you need to use a very strong rope

When choosing, it is important to consider its characteristics. For example, if the search involves a magnet capable of pulling out an object weighing 400 kg, then the breaking capacity of the cord should be no less

Particular attention should be paid to the diameter, it should be at least 0.4-0.5 cm. But the length depends on the scale of the search; rope of 10-15 meters is in great demand

Ways to bind a search magnet

The main secret of success is proper lacing. Initially, you need to tie the magnet with a constrictor knot, use a surgical one a little higher, and secure it all with an academic one. Pull and cauterize the end. Tie the cord on your hand so you don’t miss it when casting.

About a homemade device for demagnetization

Judging by numerous reviews, tunnel devices can be used for this purpose. The design of such a device includes a coil connected to the mains. There is a hole inside the coil where the workpiece should be inserted. Demagnetization can be successfully performed using a homemade electromagnet. It is not difficult to make it from some materials and available tools.

The operating principle is to control the current. Magnetization is carried out by constant voltage, and by alternating voltage - the opposite effect. The reels are made from old TVs. It is enough to disassemble it and remove the demagnetization loop in the kinescope. Then it is folded at least twice. It all depends on what diameter the home craftsman needs.

It happens that one loop is not enough. In this case, it can be supplemented from another old TV. Further, the design is equipped with a fuse button, which will ensure uninterrupted operation. A device designed for 220 Volts is suitable for permanent use, and 110 Volts are suitable for short-term connections. If the product is 12 V, then experts recommend using a transformer. With such a homemade mechanism, you can successfully demagnetize even large parts.

A kinescope from a TV is by no means the only option for a home craftsman. Judging by the reviews, good products are made from old reel-to-reel players. The part to be processed should be placed near the product.

Tips for choosing

In addition to their shape, the devices also differ in the strength of the radiation and the method of attaching the cable.

Experienced treasure hunters are advised to choose powerful double-sided magnets, since they are universal and easy to use, although they are more expensive.

Weight and ammunition

Any tool is most effective if it is selected in accordance with the task at hand. The choice of magnet is no exception. To begin with, you should decide what items it will be used to search for, and based on this, select the appropriate device.

In addition to the magnet itself, you will need a cable with which the search device can be lowered to the bottom of the reservoir. It is better to choose ammunition with a large margin of safety, exceeding the power of the magnet itself, in order to avoid ruptures and loss of the device. Finding him later is almost impossible.

Review of popular devices and their prices

The most well-known magnet manufacturers offer devices of varying power and cost:

Important Cautions

Here are a few points that the master should definitely pay attention to:

a sufficiently strong neodymium magnet (including magnets in hard drives) can severely damage the skin

Therefore, it must be used extremely carefully; Do not connect a wire without insulation to the battery. Instead of creating a magnetic field, the current will flow through the bare wire and shock anyone who dares to touch it; Individual electronic items can be seriously damaged under the influence of magnets

Typically, a magnetic screwdriver is too weak to cause problems with your appliances. But still, in this case you will have to use it at your own peril and risk.

Search magnet device

This device consists of a steel case, inside of which there is a neodymium magnet. It is made from a rare alloy containing neodymium, iron and boron. This compound has a powerful attractive property. Despite its compactness, it is capable of holding things tens of times its own weight.

To make it easier to get various things, the case is equipped with a special mount. It is screwed into the magnet body via a thread. On top of the fastener there is a fastener in the form of a hook or loop that will hold the cable or rope. This mount has a rigid base that is firmly screwed into the body. The entire structure has a reliable foundation, and in this case, there is no fear in lifting any expensive and heavy thing.

Principle of operation

The search magnet has rather poor functionality. The main task of such an object is to attract as many metal objects as possible. But the device copes with its main task more than well. Thanks to its unique design, it has great strength and is able to hold quite large objects, as well as objects containing gold or silver, which ordinary magnets cannot handle.

This is especially convenient when getting things out of wells, funnels and various pits. It's also good to use this thing underwater. In water, all objects are subject to great resistance, and picking up any object becomes a rather labor-intensive task. But with a neodymium magnet, searching and removing such objects is greatly simplified.

What items can be found

When asked what kinds of things can be found using a search magnet, iron objects, including coins, immediately come to mind. Almost all paramagnetic metals can be found. Simply put, materials that are attracted to the magnet body, but more on that later. Such coins, or precious metals, can be of great value. For example, you can find iron coins from the period of Tsarist Russia, as well as many rare Soviet coins.

Powerful magnets can attract metals such as:

Most searches are carried out in attics, in various beaches and public places where people can lose things, as well as in wells and pits. In such places they usually find costume jewelry, expensive jewelry, various metal boxes, and sometimes even expensive mobile devices (on the beach). This is what finding things on land is all about.

As for water, you can also find many valuable things, including gold jewelry. Also, thanks to superstitions, a whole fortune of coins can be raised from the bottom. Moreover, there is no need to get coins from city fountains, since there are quite a lot of abandoned wells that no one needs, but they store precious things.

Using a magnet

Experienced craftsmen recommend that beginners use a regular magnet for demagnetization, but it must be large in size and round in shape. For example, consider a magnet from a speaker.

Before starting work, you need to run a strip under the surface of the magnet. To do this, you can take scissors, tweezers, a metal tool or a drill.

Bring the magnet to the instrument as close as possible for 10-20 seconds. This will be enough to completely demagnetize the product.

Types of magnetic clips

There are many types of magnetic clips, let's look at the most common:

• Label. It is small in size, fixed directly to clothing, often in a place where the buyer does not look. If it is damaged in the store, the signal will immediately turn on. There is no splatter paint inside the label.
• RF tag. Triggers at the exit when trying to secretly remove an item. It can be easily removed at home without damaging clothes and does not contain paint inside.
• Magnetic-acoustic sensor. It looks like a plastic tag with a convex part, inside of which there is a bottle of paint. When you try to remove it without a special device, it closes even more tightly or splashes neon paint around itself.

Equation of motion

Now it's time for the equation of motion. Using Newton's second law, it will be very easy to write it down. Solving the equation for is not interesting, because, well, the coordinate simply changes at a constant speed. It is much more useful to know how quickly the fall stabilizes, what the steady-state speed of fall is. In general, we need to solve this equation for speed. And the solution will be like this. Here is the damping coefficient. The characteristic time for reaching a steady state of decline is . Initial speed - , steady speed - . In general, this is the equation of a parachutist. This is probably why the Popular Mechanics article is called “Magnetic Parachute”.

How to make a magnetic screwdriver at home

A magnetic screwdriver is a useful tool in the household, but it is not used very often. Therefore, for her, the “magnetizer”, in fact, risks becoming simply an unjustified item in the expense item.

It follows that there is a need to find a suitable method that explains how to make such an instrument at home using improvised means. That is, without using a magnet in principle. And there are several options for how this can be done.

Improvised reel

If you don’t have any magnet at hand, but you need to magnetize a screwdriver here and now, you can make a suitable device yourself.

All that is required is to wrap any metal object with a layer of plain paper and varnished copper wire.

To get it right the first time, you will need a decent length of wire - enough for 200-400 revolutions (depending on the size of the object). This will create a coil to which voltage can be applied.

Voltage can be obtained, for example, from a battery, charger, etc.

Household electrical network

This option will also require a homemade coil. The only difference is that the voltage is supplied from a household outlet. A very important detail is the presence of a fuse that will help avoid short circuits.

Extreme care must be taken as there is a risk that the fuse may burn out when connecting

Hammer

Surprisingly, you can magnetize a screwdriver even with a regular hammer. This can be done if you hit the screwdriver shaft a lot and often. The trick is that there are enough iron atoms in the steel from which the shaft is made. And hammer blows help align them in the same direction and thereby create a magnetic field.

This may take some time, but this method can be useful if you really don’t have anything other than a hammer at hand at the right time. It is easy to demagnetize the tool in the same way - by hitting the shaft several times. This will again disperse the iron atoms, destroying the magnetic field.

Battery

This method is used more often than others, so it will be described in more detail.

For magnetization you will need:

• 6-9V battery;
• duct tape;
• electrical wire about a meter long (core dimensions up to 1.3 mm);
• insulation stripping tool.

What do we have to do:

1. Remove approximately 2.5 centimeters of insulation from the ends of the wire. The diameter of the core must be at least 0.6 mm, because too thin a wire risks overheating. And too thick won't do any good.
2. Thanks to the wire with thin insulation, magnetization will be more effective. The best result will be obtained if you use enameled winding wire. To clean it, you can use 220 grit sandpaper.
3. Wrap the wire tightly around the screwdriver shaft 10-20 times. If the instrument is short, you can wrap it in a couple of layers. But you should not change the direction of the winding. For example, the correct way would be to move right, left and then right again. If necessary, the wire can be secured with tape.
4. It is advisable to wear rubber gloves first as a protective measure. They will protect against electrical sparks and possible electric shock.
5. Attach the ends of the wire to the contacts of the battery - it is the source of direct current here. The incoming electricity will create the necessary magnetic field.

Important! It is not recommended to use batteries of higher power if the technician does not have sufficient experience in handling this device correctly. The fact is that any battery more powerful than nine volts needs to be attached to the wire for literally a second or two

And this is enough for magnetization.

1. The tool shaft wrapped in wire will be magnetized. However, you should be careful, since in the process both the contacts of the current source and the wire will heat up quite quickly. You can remove the battery within a minute.

Now you can try to lift the screw with a screwdriver. If it doesn’t work, and the magnetic properties disappear immediately after disconnection, you can try magnetizing again. But this time make more turns along the shaft.

It is important to carry out any of the above methods in compliance with safety precautions. Otherwise, there is a risk of causing serious harm to your own health.

If the master does not have the necessary experience or knowledge, it makes sense to consult a specialist for advice.

It's easy to demagnetize a screwdriver. If you need it urgently, a few blows on the shaft will suffice. If not, after a certain time it will lose its magnetic properties on its own.

DIY degaussing device

Experienced pilot

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The topic was inspired by watching a video where a guy spent half an hour demagnetizing a copter’s compass using a permanent magnet.

A bit of an amateurish theory: metal objects are demagnetized in an ALTERNATING DECREASING magnetic field.

It’s easier to do this with the help of some unnecessary network transformer (power supply to the primary winding from a 220 Volt network). I used a transformer from an Elf reel-to-reel audio recorder.

We remove the clip, take out the core, assembled across the roof from W-shaped plates and closing plates. The bottom line is this: you need to “open” the magnetic gap, ensuring the radiation of magnetic energy into space.

We insert the W-shaped plates into the coil, but we don’t need simple ones. Naturally, the device will respond to such an upgrade with a very loud noise and increased heating. We remove it by tightening the core. You can wrap it tightly with electrical tape.

We neglect increased heating - we need a few seconds for the process.

So, the process itself:

1. The aircraft must be turned off. (Remove battery)

2. Before turning on, we place the demagnetization device at a distance of a meter and a half from the copter. Depends on power. For low-power transformers, ten centimeters are enough. I have a 40 Watt transformer - a meter distance before turning it on.

3. Turn on the device and, using circular movements, bring it closer to the demagnetization point - the compass. No need to touch. It is enough to bring it a few steps closer. see. We also move the device away to the original distance using circular movements.

The whole procedure should take 5-10 seconds. It doesn't make sense any longer.

Warning: if during the demagnetization process the power in the demagnetizer is accidentally lost, the effect will be the opposite - we will magnetize the compass. It's okay - we carry out the procedure again.

Honestly: I don’t see any reason to magnetize the compass. Obviously, this can happen after flying over powerful power grids or (oddly enough) after simply standing the copter next to pipes through which water flows.

#2 OFFLINE APV

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Practical and very correct and competent advice! Once upon a time I used this method to demagnetize clock screwdrivers and the grids of ray tubes (picture tubes) of color TVs. By the way, many people probably magnetize the compass with magnetic screwdrivers, some transporting it in the trunk of a car where powerful speakers are built-in.

#3 OFFLINE YUHA

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Oops! I forgot about ". transporting in the trunk of a car, where powerful speakers are built in.” — suffered from disco crap as a child

Stopudovo - the magnetization option is possible.

Gentlemen! Just don’t try to demagnetize the compass with a permanent magnet. The result will most likely be the opposite!

I once demagnetized watch screwdrivers like this

But here there is a double interpretation: Sometimes it is necessary for the bolt to be held on the tip of the screwdriver. We simply magnetize: bring a screwdriver to the demagnetizer and turn it on briefly. Of course, it all depends on the properties of the steel of the screwdriver.

#4 OFFLINE Snortwild

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Here are the instructions in the assistant.

Typically, there is no need to calibrate the IMU by the user. If the LED flashes green quickly when stationary on the ground, please try Basic or Advanced. calibration by sensor Mod.

1. Gyro 'Mod' value is usually in [0.0, 1.5], if it's in the range [1.5, 3.0], great. If it exceeds 3.0, pre-calibration is necessary.
2. The 'Mod' value is usually [0.98, 1.02], if it's in the range [0.97, 0.98] or [1.02, 1.03], great. If it is less or more than 0.97 1.03, accurate calibration is necessary.

The compass (raw) shows the raw magnetic vector data, and the normal range is -500 +500. The 'Mod' shows the calibrated magnetic vector modulus data, and it can be used to check the calibration effect.

If the 'Mod' value is below 750 or beyond 2250, you should check whether there is magnetic interaction or not. If yes, clean them and reconfigure them.

If not, and the 'Mod' value is still outside the normal range after calibration, try using a magnet ( 0

#5 OFFLINE YUHA

Experienced pilot

Gyro 'Mod' value is usually in [0.0, 1.5], if it's in the range [1.5, 3.0], great. If it exceeds 3.0, pre-calibration is necessary.

I have a different reading: “. normal range of values ​​is 0.0-1.5. If the range is 1.5-3.0, do an initial calibration. If above 3.0 - extended."

It's a pity that I don't speak English.

By the way, the P2V+ compass case is non-magnetic. Those. if any influence of a magnetic field (any kind) is required, then only on the guts of the compass. I didn't see what was inside.

Magnetic field and metals that conduct it

A magnetic field is a force that can influence electric charges, atomic nuclei, and simplest particles. This is matter that arises from the interaction of particles that have their own charge. All substances react to this field, and some emit it.

Depending on the reaction, the substances are distinguished:

1. Ferromagnetic materials react to fields and retain magnetization. Thus, they themselves begin to emit their own field.
2. Paramagnetic materials - the electrons in their composition react to a magnetic field so weakly that such a reaction can only be detected using special measurements. Such substances include platinum, aluminum, oxygen.
3. Diamagnets are substances that do not attract, but, on the contrary, repel from a magnet, exhibiting negative susceptibility. Diamagnets include copper, water, carbon, gold, and silver. Most substances known to science are diamagnetic.

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The main reasons for metal magnetization

Magnets are media that create their own magnetic field. Main groups of magnets:

• paramagnetic materials;
• ferromagnets;
• Diamagnets.

Steel products based on alloys of iron, cobalt or nickel refer to substances whose own magnetic field is higher than the external one, i.e. to ferromagnets. The magnetization of a substance is considered to be the sum of the magnetic properties of particles per unit volume.

At the moment the Curie temperature threshold is reached, spontaneous domains with magnetization are formed, which spread until they are completely filled. Under normal conditions, it is possible to obtain a magnetized tool when working close to electric motors, magnetrons and other elements. The metal takes away the properties of magnetism from a nearby emitter, thereby becoming magnetized.

Working with small parts with a magnetized tool can cause a lot of trouble. Sharpening metals with increased magnetism properties is impossible to ideal sizes, because... the material is covered with shavings.