Aren't you pissed off when you pick up your screwdriver and a screw gets stuck to it??? I got tired of that and decided to build a demagnetizer out of an old transformer which was pure crap (i mean the transformer was crap)
Step 1: Materials and Tools
You need only 3 things to do this Instructable:
Old EI transformer which you don't mind destroying it
Hammer (the must have tool in every workshop :D)
20 minutes of your precious time (5 minutes for reading this Instructable, and 15 to build the demagnetizer)
Step 2: Taking Apart the Transformer
When you have successfuly selected the "victim" its time to take it apart. Take apart the housing of the transformer, bolts which hold the laminations(if there are any), and hit gently one side of the transformer with the hammer to get all I laminants out from one side, and do that on the other side. When you will get the I laminations out use one of them to get the E laminations out. After 2-3 E laminations ripped out the transformer will get fall apart by itself.
If you are more experienced transformer destroyer you will wont be needing more than 10 minutes to do this
Step 3: Geting Back the Transformer
When you have disassembled the transformer, and until you blink its time to take it back :).
You will wont be needing the I laminations for this, which means you will need to throw them, or do something else with them. You will put back all E laminations in place all turned on way (not like when you disasembled it) and put just the primary (if you can't separate the primary out of the secondary you can leave it like that, or unwind the secondary) and...JOB DONE!!!! now you are ready to try it out.
Step 4: Using It
When you spended a time of your life doing that its time to try it out. First you will need to secure the transformer somehow to the table you are going to use it on(just temporary). Plug in the transformer, and get the tool you want to demagnetize to the transformer, because of the magnetic field the tool will be drag down to the core, and you will need to get it out of there (pull it) and test the newly demagnetized tool on some small nut to try if your demagnetization was successful, if it isn't do the same thing again. And you are DONE.