Knifemaking Shrapnel

When our local hospital installed their first MRI machine, during the tune up, it pulled a cement truck parked next to the room up onto two wheels.I figure they really poured the juice to it testing it out. It caused quite a stir among the X-ray department
 
my sister has a plate and screws in her jaw from surgery cause she had a masive over bite, hers were Ti and it was perfectly fine.

-matt
 
Dave, it took over an hour in the machine before my hips started to heat up and that's a lot of metal. I was getting a full-spine scan. I could feel them warming, not anything like they were cooking me or anything. Not to worry. Sorry if I rattled you.

I'd be a more concerned with magnetic steel materials.
 
Abrasive Dave...marinade in the tub tonight...just in case :)
 
This is what I thought of when Fitzo mentioned things getting warm in the MRI.

It's someone capturing microwave plasma (sort of a ball lightning effect) in a microwave oven experiment:

http://www.youtube.com/watch?v=s9Q070Ol6jc&mode=related&search=

Abrasive Dave: If they want to put you in a big microwave oven, I'd recommend against it!;)

BTW, I know folks that have Ti implants that were OK with MRIs. :thumbup:
 
No, I don't remember anything like that happening. :D No sparks, no smells of meat, just a mild warmth that was definitely coming from the hip metal. It was more interesting than anything else, not unpleasant.
 
Everything went fine (even without marinade ;) ) - thanks, guys.

No vibration, no heating that I could detect. It seemed like they took more "break" time between cycles than they did on my first, pre-surgery MRI. Maybe that was to keep the heat down? Or maybe the operator was just out having a smoke. ;)

I do have two tattoos on my arm, both black ink. First MRI I swore I could feel them heating slightly, but thought it was just in my head. This time, I can confirm that I could feel some heating there. Nothing major - just like sun shining on my arm. Weird!

Dave
 
I have a nice 8" plate and 12 screws holding my left forearm together and felt nothing during my last MRI except a severe feeling of claustrophobia and paranoia. They did send me for a full body xray beforehand when i told them i grind steel 3 nights a week. They were worried a sliver of metal might have got in my eye and that it'd be pulled through my eyeball. I consented in about .00001 seconds when they said that.
 
Abrasive said:
....

I do have two tattoos on my arm, both black ink. First MRI I swore I could feel them heating slightly, but thought it was just in my head. This time, I can confirm that I could feel some heating there. Nothing major - just like sun shining on my arm. Weird!

Dave
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I'm glad you mentioned that about the ink. Here I thought I was imagining things.

In a way, Joe's comment about microwaves has some relevance to MRI. The patient is put in a large magnetic field and then exposed to radiowave frequencies turning on and off. I don't know the frquencies or the field strength, but that's sorta the same concept as nuking a frozen dinner, isn't it? :D
 
fitzo said:
I'm glad you mentioned that about the ink. Here I thought I was imagining things.

In a way, Jon's comment about microwaves has some relevance to MRI. The patient is put in a large magnetic field and then exposed to radiowave frequencies turning on and off. I don't know the frquencies or the field strength, but that's sorta the same concept as nuking a frozen dinner, isn't it? :D
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Which reminds me, someone ought to try to use that dang cherry crisp stuff from frozen dinners as forge insulation. That stuff stays hot longer than anything I've ever seen :)
 
I'v got a big, old, ugly hands with lots of metal slivers of all kinds, Some come out, some stay, some travel a bit. Fact is, if you grind or bang on metal your gonna get some slivers. A couple of years back, a little piece of frag that was in my chin since Viet Nam festerd its way out. If it don't hurt don't screw with it. Oh yeah, "bobby t." told you to get an MRI...Don't! An MRI is a giant magnetic field that could yank that sliver to any point in your body. As body parts go that index finger is much less important than let's say your lung or your brain or mayhaps your heart.
 
The magnetic field induces an electrical current in metal. So you are a human magneto during an MRI if you have any metal in you.
 
OldPhysics said:
If it hasn't entered the joint, you're in good shape.

Forget extraction by magnet. You'd need an 'industrial strength' electromagnetic...it's just not worth it.

I've had the same general experience as ashtxsniper, but with bits of Carbon rather than metal.

Just keep a general eye on that knuckle. If the joint starts to hurt, if you get swelling or too much discoloration...then get thee to a doc.
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I've had a piece of mechanical pencil graphite in my forearm for going on eight years now. It was a small piece, and an accidental self-stabbing, during a college course.

I've had slivers of metal more than a few times, too. Those seem to come out on their own. But getting discoloration sounds like the kind of nasty cuts you get from Galvanized. I wonder if something in the metal did it to you?
 
enderwiggin said:
I've had a piece of mechanical pencil graphite in my forearm for going on eight years now. It was a small piece, and an accidental self-stabbing, during a college course.
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I'm sure there's a good story behind that one ....:D

enderwiggin said:
I've had slivers of metal more than a few times, too. Those seem to come out on their own. But getting discoloration sounds like the kind of nasty cuts you get from Galvanized. I wonder if something in the metal did it to you?
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It was probably the zinc (zinc-plated screw fragment). The thing was pretty much a projectile that went in really deep. Too deep to get at or even see.

I was kind of worried about the joint being invade by it, but it seems to be almost completely healed up now. Discoloration is all but non-existant too. :thumbup:

I'm pretty relieved, because this little thing shot in deep and things started acting/looking funny right away. Had me worried there for a bit, but I think all is well!:)
 
That's certainly good news, J.! When I spotted your thread here, I thought you was talking about regular shrapnel, the battlefield sharpnel. A couple of well known member makers received boxes of sharpnel from me and put it to good use. Well, IG was going to get around to it, I don't know if IG has found the time or decent weather to forge it. J. Neilson and his lovely bride certainly put it to good use, the beautiful Purple Heart knife and sheath.
 
John Andrews said:
That's certainly good news, J.! When I spotted your thread here, I thought you was talking about regular shrapnel, the battlefield sharpnel. A couple of well known member makers received boxes of sharpnel from me and put it to good use. Well, IG was going to get around to it, I don't know if IG has found the time or decent weather to forge it. J. Neilson and his lovely bride certainly put it to good use, the beautiful Purple Heart knife and sheath.
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:confused: Are you talking about forging battlefield shrapnel forged into knives?:confused:
 
yep, look at the Purple heart knife thread that got bumped back up, really cool idea its very good looking and a very nice way to say thanks
-matt
 
Abrasive said:
Everything went fine (even without marinade ;) ) - thanks, guys.

I do have two tattoos on my arm, both black ink. First MRI I swore I could feel them heating slightly, but thought it was just in my head. This time, I can confirm that I could feel some heating there. Nothing major - just like sun shining on my arm. Weird!

Dave
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Old black tattoo ink is often chelated oxides of iron... black rust in laymans terms. I'm dabbling in tanning skins at the moment, and one recipe to dye the furs and skin black is to gring rust into vinegar (acetic acid) and dunk the skin into that while still wet and soppig from the tannic acid solution. comes out dark matte black.

if your tattoos cook up, I'd be willing to put a bob or two down on your ink being iron based :D:cool:
 
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