FUN PROJECT: Have anyone seen these EMI properties in Spydies? Sal?

H

Heyns van der Merwe

Joined
Mar 3, 1999
Messages
232
To all forumites,
I've seen the darndest thing this morning!

I've sent a Weblink to a friend at work (Petri, an Endura-is-everything-I-need type), for obtaining a Jess Horn for his father. While we were discussing the pics (on a website) of the Jess Horn, we held his Endura to the computer's screen to compare "looks" and "size" between the two models. The screen INSTANTLY warped around the blade, indicating SERIOUS EMI (Electro-Magnetic Interference) from the Endura's blade (the Endura's blade is magnetized!!)

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PLAYTIME!!!!!!
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We then tried the same with MY Military, MY Endura, MY G10 Harpy and MY Bill Moran (sorry, that's all I have on me today!!
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). Just to validate the test, I've also tried a Victorinox (blasphemy!!) Swiss Army Knife (Explorer model).

The results:
- Petri's Endura shows SERIOUS EMI properties
- my Endura shows NO detectable EMI properties
- my Military shows minor EMI influence
- my Bill Moran shows NO EMI influence
- my Harpy shown NO EMI influence
- the Victorinox shows NO EMI influence

So, is this EMI (screen warping/darkening with the knife against the glass, due to magnetization inherent to the knife's blade) influence a function of sharpening? It can't be metal types (we've tested for that!). Is it a fuction of steel treatment at the Syderco factory? Is it Petri's electric personality? (well, I've tried it holding the SAME knife, and it still works
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).

This MUST be an intrinsic quality of the knife steel (not a static electricity "charge"), because we've tried electrical 'grounding' of the knife, with the same test results!

Please TEST your knife and let us know the results via this thread!

PS: all knives showing the magnetic effects, have been sharpened using Lansky and Spyderco SharpMaker 204 kits...

[This message has been edited by Heyns van der Merwe (edited 18 August 1999).]
 
Well I've been playing with my new Peter Herbst all day... no, nothing. Sorry, no play for me... all work... well maybe I should at least try to get some work done today...
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Hugo
 
Noticed darkening, but no warping with my large CRKT Mirage. No effect from my small SAK and a small Schrade keychain lockback.

Both the SAK and the Mirage have been sharpened on the 203 Sharpmaker several times.
 
Hmmmmm.... the plot sickens (sic)
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Darkening of the screen shows the presence of magnetic properties of the blade steel, as the electrons of the cathode ray tube (CRT) of the monitor are "focused" on more dense concentrations of the (normally invisible) magnetic field lines from the knife...

During a quick re-test just now, we have even noticed that this effect shows the presence of polarizarion (differences when the knife is held horizontally versus when it's held vertically!...)

And we've ONLY seen this with sharpened knives... (user-sharpened)
 
FWIW, I just tried it with the few knives at hand -- Centofante, BF Native, Harpy, Bauchop UtiliCat, & REKAT Hobbit Fang -- with no effect whatsoever.

------------------
Cheers,

--+Brian+--

 
I get the warping/darkening of my screen with my Endura (aus-8 version), but nothing from my Starmate(440V), and nothing from my leatherman wave.

Interesting...
 
Are these held in a magnetic clamp for grinding?

One I did notice was an auto I sharpened became magnetized afterwards. All the fillings would then cling to the blade.

Sam.

------------------
Bleating and babbling, they fell on his neck with a scream. Wave upon wave of demented avengers March cheerfully out of obscurity into the dream.

-Sheep (Pink Floyd)

[This message has been edited by SammyB (edited 18 August 1999).]
 
Absolutely nothing from my varied assortment. Spydies are all ATS-55. Crawfords are ATS-34, Emerson's are ATS-34 or 154CM.
 
Tried it with NIB Knives:

SPYDERCO:

Military- no
Calypso - no
Jess Horn - no
Delica - no
Khalsa - no
CF Ladybug - no
Spydie Necklace Knife - no

Kershaw:
Kershaw Talon- no
Kershaw Titanium Talon - no

R.E.K.A.T.:
Carnivour - no

Tried it with knives sharpened on a Lansky System:

Jess Horn - no
Military - no
Delica - no
Starmate -no
Calypso - no
Kershaw Richochet - no

Hmmmmmm guess I just don't have that magnetic personality!
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[This message has been edited by Excalibur (edited 18 August 1999).]
 
Hey Heyns,

Aren't you in South Africa? Maybe something about crossing the equator?
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------------------
Work hard, play hard, live long.
Outlaw_Dogboy

 
PlainEdge Endura that's been sharpened with a Lansky - no
SpyderEdge Calypso, never been sharpened - no
PlainEdge BF Native, never been sharpened - no
PlainEdge Military - yes

Now, I haven't sharpened the Military, and it was supposed to be NIB. However, this is the one I mentioned previously that isn't very sharp. When I get around to it, I'm going to send it in to Spyderco, so they can check it out.
 
Geez - u guys?!

Native - no
Calypso - no
Goddard LTWT - no
Schrade BB - no
Rescue - old no
Pioneer - old no
Delica 98 no

Nothing magnetic here
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The cordless razor is good for magnetic fields: does that count?!....LOL.
 
Just got my Benchmade 840-SBT today. Yep, it darkens the screen. It's ATS-34. As you say Heyns, the pattern is different depending on whether I hold the blade vertical or horizontal.

No sharpening here, it's NIB and only opened about 50 times now (give me a day or two).

[This message has been edited by Bob Irons (edited 18 August 1999).]
 
Many steels will become magnetized after exposure to static magnetic fields. My ATS-55 dragonfly went from completely nonmagnetic (according to the Monitor test described in the previous posts) to magnetic enough to pick up a shoe-polish can lid after only a few seconds exposure to a refrigerator magnet. It is bad news near my monitor now.
You can demagnetize steel by exposure to heat (maybe not a good idea with knives, though the temps involved are probably not high enough to effect the temper) or to oscillating magnetic fields (like a vcr tape eraser.) Or, you can ignore it.
As for sharpening, I'd have to test to see if a magnetized blade was harder to sharpen.
Wolf
 
k, here it goes.

M2 AFCK- no
Normark Fillet knife- no
SRK- no
Western 221- no
Scharade skinner- no
ENDURA- Oh heck yeah.

I dont know why, because all my knives have been sharpened with various sharpeners, and all have seen a steel diamond hone. the other knives show nothing.. whatsoever, but the endura shows quite a bit of magnetism.
 
Quite a number of different observations!

I don't suppose any of you EVER used your MAGNETIZED Spydies near explosives, eh? We get to work with the stuff (or in the vicinity of it, anyway - DON'T ASK, IT'S WORK-RELATED!) regularly, and I know you're NOT supposed to have any sort of electricity or magnetized iron near it... I suppose the guys who DID commit this error, won't let us hear about it...?
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Anyway, I've grabbed a few more knives today than the ones I usually carry. I will repeat the test with these, so we can see some trends developing as new inputs are posted...

BUT I guess we are still waiting for Sal's inputs...
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Results from Austria.

Starmate - no
SAK - no
C-15 - yes; G-10 scales, part.serr.; I seems that only the plain part of the blade shows EMI; this is also the part of the edge that was sharpend by me. I did this on the 203 sharpmaker.
I think I have to get a 204 sharpmaker, for scientific purposes only, to conduct another test.

Greetings
red
 
OK, new results!
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(I'll have to admit that NOW I'm baffled...). Now I'll HAVE to test the rest of my collection at home tonight - will post the results tomorrow.

Renegade: NO EMI evident
BlackHawk Plain: NO EMI evident
BlackHawk Serrated: NO EMI evident
Military Plain: NO EMI evident
Endura Serrated: NO EMI evident
Tim Wegner Jr 60/40: NO EMI evident
Remote Release Serrated: NO EMI evident
Delica Serrated: NO EMI evident

So, why NOT? Most of these were sharpened (some repeatedly) with the MF203 and MF204 Spyderco SharpMakers... Are we barking up the wrong tree concerning the sharpening influence? Can the magnetization effect that we've seen on a few (different) knives so far be a result of everyday, personal carry in some way?

I'll call in the help of the metallurgists in our company at this stage... We can list this one under "Spyderco's believe it or not!"

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!!THE TRUTH IS OUT THERE!!
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