I'll try to remove the magnet from the speaker. Speaker with a diameter of 350 mm, released in 1980 in Novosibirsk. The magnet must be powerful enough.
I need magnets to place small tools on it. The magnet is attached to the wall and the tool will always be in sight.
I only advise you to place magnets away from vices and other places where a lot of metal dust and shavings are generated when working with an angle grinder. Dust will be attracted to the magnets.
I once heard that a magnet can be peeled off from its base—a metal plate—by heating. Heating the surface softens the glue and the magnet is released. If you try to knock out the magnet, parts of it may remain on the plate. Therefore, this method is undesirable.
Removing the magnet from the dynamic head
I unscrew the fasteners and remove the aluminum cover.
There is a copper blank at the bottom of the structure. It can be seen that they have already tried to unscrew the magnet - the edges on the bolts that hold the bottom plate are torn off.
I turn the speaker over and start using a torch to heat the surface of the top metal plate.
Important! When heated, the magnet may lose its properties, so the temperature must be adjusted.
Using circular movements of the burner, I heat the surface of the plate. I periodically touch it with my hand to check the temperature. After heating, I begin to beat off the metal plate with a chisel and hammer.
You must work carefully because the surface is hot. After several blows, the plate begins to come off, and there is a smell of glue in the room.
The edges of the copper ingot are in the way. You have to hit it several times with a hammer. After which the magnet with the top plate leaves the installation site. The plate comes off easily and I have almost a whole magnet left in my hands.
The method turned out to work quite well. The metal must be heated to 70 degrees for it to start burning your hand. The glue becomes soft and the metal plate can be separated. After this, warm it up a little more and you can start working with a chisel.
There is no other way to remove the magnet without damaging it. The magnet will either crack or partially remain on the flange-shaped metal plate.
From the plate I will make a faceplate for the lathe. To do this, the plate must be sharpened. The part is mounted to the faceplate and clamped with a bolt, and the faceplate is inserted into the lathe chuck.
Previously, I had already obtained magnets with a diameter of 120 mm from car speakers. The diameter of this magnet is 135 mm. It is strong enough to attach a variety of tools to it, including a metal hammer. The item in the workshop is very useful.
Tip: it is better to secure the magnet on the wall so that it does not fall from the weight of the tools.
