How to demagnetize a blade?

Old CW4 said:
Surely you or someone you know has a soldering gun.
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Yeah; me ;)

That's exactly what I did. Before that, I was beating the blade with a really strong magnet. It was hard to get all the magnetism off like that; it left some magnetized spots, so I'd try again, then some other spots would get magnetized... The soldering gun did the job in one try.

Old CW4 said:
Also second every one else's warnings about microwave ovens. DON'T put metal in a microwave---EVER!! On top on that, I doubt the radio energy from the magnetron tube in the oven would do anything other than heat the blade, possibly ruin the temper, and damage the microwave.
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I read that magnets will attract the microwaves, so it will become very hot and might eventually melt. Which would ruin the heat treat, which was my concern with the microwave in the first place...

I think the first reply ought to be edited so that some newcomer to the forum doesn't read that when he looks up "how to demagnetize a blade" and stop reading the responses and goes to put his blade in a microwave...
 
THG said:
I stuck it through the soldering gun once, and that did the trick. Awesome.
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Cool! Now you'll have no more magnetic knives, screwdrivers, needle nose pliers (that's the worst) etc.

I always keep the soldering gun handy ... but damned if I can recall the last time I soldered anything. :)
 
You don't beat the blade with a magnet! Tap the blade on something hard, or tap the blade with a hammer.
 
Dog of War said:
Cool! Now you'll have no more magnetic knives, screwdrivers, needle nose pliers (that's the worst) etc.
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Oh, good idea; that reminds me that my Leatherman Blast has magnetized needle nose pliers for some reason...

Bill DeShivs said:
You don't beat the blade with a magnet! Tap the blade on something hard, or tap the blade with a hammer.
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Tapping the blade didn't work. Using the magnet scrambled the polarity of the magnetic blade, but it kept leaving magnetic spots here and there.
 
if you gots CRT TV or computer monitor, lay your knife on top of the minitor at the very front, and then find the degauss button and activate (you'll notice when the screen goes squiggly) -- that should do it
 
el dub said:
hello electro magnet
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Well, technically it would be, but by running alternating fields through it you will scramble any magnetic properties in the metal. It's exactly the same as pulling the blade through a soldering iron loop.
 
Rey HRH said:
Why not get a cheap degausser?
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Maybe you could add some pertinent info in order to say there was a reason to post in a 6 year old thread...

Just to let you know, I don't care. Most of the mods do, though, unless there was a reason for it.
 
Just buy a DEMAGNETIZER - it is pretty explanatory, but you can buy an item then you run a knife or tool through, and it will demagnetize the blade, you may need a big one for larger fixed blades.

Also you can just buy a magnetizer as well, these things usually do both.
 
bodog said:
Maybe you could add some pertinent info in order to say there was a reason to post in a 6 year old thread...

Just to let you know, I don't care. Most of the mods do, though, unless there was a reason for it.
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Because you asked: It was an interesting thread that was on the front page when I answered it. I don't know how a 6 year old thread got to the front page. It's not like I go past the 2nd page of any section unless I'm looking for a thread I already posted in. Even now I checked and the last page is 7 and the oldest post there is from 9/16/2016. So that's the reason - it was on the first page. And maybe that's also the reason why I've seen the same from others.

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Here's some pertinent and updated info:

DO NOT microwave your blades. It will do nothing for the magnetism and could possibly screw up your microwave.

The same goes for wrapping your blade in wire and applying AC voltage. This will NOT demagnetize your blade either - and may get you hurt. AC will demagnetize if it's used properly, but wrapping a wire around your blade and plugging it in is NOT the proper way. The coil must be of the proper length to provide the correct resistance so that the wire doesn't just melt through or so that the circuit breaker doesn't blow - or a transformer must be used to reduce the voltage. If you want to demagnetize the blade with AC, the blade must be able to freely pass through the coil of wire, and the blade must be well and truly distant (at least arm's length) from the coil before the voltage is turned off or it will not work. This is the same principle as the soldering gun method. Another way is to use an autotransformer or "Variac" and reduce the voltage slowly and gradually.
 
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