sebenza magnetized blade

V

Vermont woodsman

Joined
Jan 22, 2005
Messages
212
I little spot 1/4 inch by 1/8 inch of my sebbie blade seems to be magnetized , i have no idea how that could have happened, but i found a staple stuck to it. Ive heard you can boil it and all will be fine, but could boiling it warp anything?
 
A magnetized spot on the blade may indicate an improper heat treat! There should be no residual magnetic property to the blade steel after heat treating; I would consult CRK on this issue. Alternatively, the steel may have become magnetized if it has been subject to a shock or impact.
 
Is very common in a lot of steels, not just knives. You can magnatize a piece of steel just by smacking it against something else (like a steel bar against a fire hydrant or something else hard like that) It's just aligning the electrons or something like that, to cause the steel to be magnetized. I think that after you grind steel, it can be magnetized as well.
 
IIRC they use magnetic chucks in the production of Sebenzas. Can anybody confirm this? Would that leave residual magnetism possibly?
 
Paul Davidson said:
IIRC they use magnetic chucks in the production of Sebenzas. Can anybody confirm this? Would that leave residual magnetism possibly?
Click to expand...

Paul,
You are the grand prize winner! Yes, CRK does use a magnetic chuck when surface grinding the flats of all Sebenzas, GBs, etc. My guess is that this particular blade has some residual magnetism from the surface grinding process, or the owner could have leaned up against something that was magnetized while packing his Sebenza (assuing that he actually carries it). Disassemble the knife and take the blade to any machine shop that has a surface grinder, and they will likely have a degausing machine as well. A couple of passes over the degauser with a soft cloth or paper towel between it and the blade, and poof the magnetism is gone(don't forget to say the magic word "nostickystickynomore"). It has nothing to do with heat treatment. :D
 
Mike,
Do you think a bulk tape eraser, like Radio Shack carries, would do the same thing? I have one of those around somewhere, though it seldom gets used in this digital era.
 
The spot that was a little magnetized was near the thumb blug...so now i wonder about that magnetic chuck. I wonder if anyone elses sebbie can lift a staple . Thanks for all the replys guys. :D
 
Paul Davidson said:
Mike,
Do you think a bulk tape eraser, like Radio Shack carries, would do the same thing? I have one of those around somewhere, though it seldom gets used in this digital era.
Click to expand...
Paul,
It's worth a try!
 
Paul Davidson said:
Mike,
Do you think a bulk tape eraser, like Radio Shack carries, would do the same thing? I have one of those around somewhere, though it seldom gets used in this digital era.
Click to expand...
Disclaimer: YMMV, someone correct me if I'm wrong.
Try it with something else metal first. I believe a bulk tape eraser/degausser is somewhat opposite of what you want. It is an electromagnet and will magnetize further if you are not careful, here is a good link Google turned up. http://bbs.homeshopmachinist.net//Forum3/HTML/001623.html

If you are that concerned I would try a demagnetizer such as this http://www.wihatools.com/40010ser.htm from a hardware store.
 
I tryed the tool demagnetizer from the hardwear store to no avail....but radio shack had a demagnetizer for audio tapes and it was on close out for 20 bucks....letme unpack it and play with it for a while....i want to try it on alot of other things before i put it near my sebenza. Ill be back with details later.
 
Most audiotape erasers, tape recorder head demagnetizers, cathode ray tube degaussers, and watch demagnetizers work on the same principal. They have a wire coil that you pass alternating current through. They may use the 60 Hz. AC current from a wall plug or the higher frequency from an oscillator. This produces an electromagnet that changes in magnetic north and south polarity many times per second. You demagnetize the metal object by turning on the demagnetizer, moving it slowly over the object, and then slowly moving it away. When the demagnetizer is close to the object, it will rapidly magnetize the object, first in one direction (polarity), then in the other direction. As you move the demagnetizer away from the object, the amount the object is magnetized as it changes polarity will decrease with distance. When the demagnetizer is far enough away from the object (a few feet) you can turn it off. The object will be demagnetized. I’m not sure if a tape eraser will be strong enough to demagnetize your blade. Good Luck!
 
Thanks for the suggestions and advice. I guess I should have said that it doesn't bother me too much, I was just surprised. It would only bother me if it were constantly picking up filings and such, which it doesn't. I have been carrying this knife for 6 years and it hasn't been a problem.
 
6 years!!! carry it to the beach and find gold, work boots and other valuable treasures!

with headphones on, of course! :D
 
I use it as a chick magnet. :D

Every time I THINK about buying another my wife is suddenly right there. Spooky.
 
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