How to remove a magnet without breaking it

I will try to remove the magnet from the speaker. Speaker diameter 350 mm, released in 1980 in Novosibirsk. A magnet must be powerful enough. I need magnets to place a small tool on it. The magnet is attached to the wall and the tool will always be visible.
How to remove the magnet without breaking it
I advise you only to place the magnets away from the clutches and other places where a lot of metal dust and chips are formed when working with the grinder. Dust will be attracted to the magnets. Once I heard that a magnet can be peeled off from the base - a metal plate - by heating. Heating the surface softens the glue and the magnet is released. If you try to knock out a magnet, then its parts can remain on the plate. Therefore, this method is undesirable.

Remove the magnet from the dynamic head

I unscrew the fasteners and remove the aluminum cover.
How to remove a magnet without breaking it
In the lower part of the construction there is a copper ingot.It can be seen that the magnet has already been tried to unscrew - the edges on the bolts that hold the bottom plate are torn off.
How to remove a magnet without breaking it
I turn the speaker over and start heating the surface of the upper metal plate with a torch.
How to remove a magnet without breaking it
Important! From heating the magnet can lose its properties, so the temperature must be regulated. The circular movements of the burner heat the surface of the plate. I periodically touch my hand to check the temperature. After heating, I start a metal plate with a chisel and a hammer.
How to remove a magnet without breaking it
Be careful, because the surface is hot. After a few strokes the plate begins to move away, the room smells of glue.How to remove the magnet without breaking it
The edges of the copper ingots interfere. You have to hit it several times with a hammer. After that, the magnet with the upper plate exits the installation site. The plate easily leaves and I have almost a whole magnet in my hands.How to remove a magnet without breaking it The method turned out to be quite working.The metal must be heated to 70 degrees so that it starts to burn the hand. The glue becomes soft and the metal plate can be separated. After that, warm up a little more and you can start working with a chisel.
How to remove a magnet without breaking it
How to remove a magnet without breaking it
There is no other way to remove a magnet without damaging it. The magnet will either crack, or partially remain on a metal plate in the form of a flange. I will make a faceplate for a lathe from a plate. Plate for this must be machined. The part is set to the faceplate and is clamped with a bolt, and the faceplate is inserted into the turning chuck.
How to remove a magnet without breaking it
I used to take out magnets with a diameter of 120 mm from car speakers. The diameter of this magnet is 135 mm. It is powerful to attach various tools to it, including a metal hammer. The thing in the workshop is very useful. Tip: it is better to fix the magnet on the wall so that it does not fall on the weight of the tools.

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