Judging by the numerous reviews, when starting to do any work, home craftsmen often face one problem - the magnetization of tools. According to experts, this property of the metal in some cases greatly helps in the work, as the tools become better. For example, using a magnetized screwdriver makes it much easier to screw in the most hard-to-reach places.
But many are interested in the other side of the issue. How to demagnetize magnetized metal? This interest is due to the fact that in some cases magnetization is undesirable. With a caliper with metal shavings adhering to it, it is unlikely that it will be possible to perform high-quality marking. It is also inconvenient to use a magnetized cutter. These tools, as a result of exposure to a magnet, significantly reduce their working properties. Information on how to demagnetize metal at home can be found in thisarticle.
What is the reason for the magnetization?
Before you are interested in how to demagnetize a metal, you should understand the nature of this phenomenon. According to experts, magnetization is carried out by paramagnets, diamagnets and ferromagnets. Products based on iron, nickel and cob alt alloys 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.
About the use of magnetized tools
According to experts, some tools deliberately magnetize. Mostly these are screwdrivers that are used during the repair of mobile phones, computers and various household appliances. Such screwdrivers will be indispensable in situations where you need to tighten the screw, but there is no way to support it with your hands.
It is better not to subject watch instruments to the magnetization procedure, since this can stop their working mechanisms. It is undesirable to work with a magnetized drill or cutter, since small metal particles sticking to the working part of the tool will cause a lot of trouble for the master. Read on to learn how to demagnetize metal.
About special appliance
Specially for this purpose, there are magnetometers, through which the tool can be given bothmagnetic charge, and remove it. For those who do not know how to demagnetize metal, experts recommend doing the following:
- First you need to determine the voltage of the magnetic field. This is a very important aspect as a mistake can backfire.
- You also need to measure the voltage on the magnet. It must have the opposite sign.
After these steps, touch the magnetometer area to the tool, as a result of which the latter will demagnetize.
How to check?
According to experts, the whole work will take no more than 10 seconds. To check the performance, the magnetized metal must be brought to the self-tapping screw. Thus, the master will see at what level of magnetization the tool is. If the result is unsatisfactory, the procedure should be repeated and then checked again.
How to demagnetize metal with an electric motor?
First, a home craftsman should acquire a low-power asynchronous unit. In this case, the alternating fading magnetic field will reduce the magnetization. Before proceeding, the rotor must be removed from the electric motor. If you want to remove magnetization from tweezers or a drill, then these products need only be inserted into the stator for half a minute. If the stator windings are disconnected from the power supply, the rotation of the magnetic field will gradually fade away. According to experts, the residual magnetization of the tool will be so small that small metal chips will no longer be able to stick to them.
Alternative
Judging by the numerous reviews, not everyone has the opportunity to get a low-power asynchronous electric motor. For such craftsmen who do not know how to demagnetize metal at home, experts advise using a step-down transformer field. There must be an air gap inside its core. In it, for half a minute, you need to introduce a magnetized tool. It happens that the procedure performed does not work. In this case, it should be repeated.
With a magnet
Often beginners are interested in how to demagnetize metal with a magnet. It's easy to deal with this job. The master should acquire an ordinary, but rather large magnet, preferably rounded. Similar products are available in speakers. Further, a drill, tweezers or scissors are carried out above the surface of the magnet. It can also be any other metal tool. The distance from the product to the magnet should be minimal.
About working with large batches of parts
There are times when you have to remove the magnetization from many metal products. This is possible with the right temperature. How to demagnetize metal with heat? According to experts, this will require heating the products to a certain state, which is also called the Curie point. Iron is heated to a temperature of 768 degrees. A ferromagnet will require a higher range. Upon reaching the desired temperature threshold, spontaneous magnetized domains are formed.
The process is as follows. First, one detail is brought to the Curie point. Next, it should be cooled down. It is important that at the same time it is not affected by external magnetic fields (the only exception is the Earth's magnetic field). Next, using a sensitive induction meter, the maximum magnetization is estimated. Further, in the control zone at a distance of no more than 2 cm from the part, a range of different values obtained by the MF-23 or MF-23M indicator is measured. Magnetic induction should be +/- 2 mT.
About homemade demagnetizer
Judging by the numerous reviews, tunnel devices can be used for this purpose. The design of such a device has a coil connected to the mains. Inside the coil there is a hole where the workpiece should be inserted. Degaussing can be successfully done with a homemade electromagnet. It is not difficult to make it from some materials and improvised means.
The principle of operation is to control the current. Magnetization is carried out by direct voltage, and by alternating - the reverse action. Coils are made from old TVs. It is enough to disassemble it and remove the demagnetization loop in the kinescope. Then it folds at least two times. 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, thanks to which uninterrupted operation will be ensured. Device rated for 220 volts,suitable for continuous operation, and 110-volt for short-term connections. If the product is 12 V, then experts recommend using a transformer. With such a homemade mechanism, even large parts can be successfully demagnetized.
A kinescope from a TV is by no means the only option for a home master. Judging by the reviews, good products are obtained from old reel players. The workpiece should be placed near the workpiece.
