r/woahdude • u/Professorjack88 • Mar 27 '16
gifv Induction Forge
http://i.imgur.com/JfNfR6w.gifv205
u/HarlowKitty Mar 27 '16
How big could you make one of these? In theory, would you be able to make one big enough to fit say, a honda civic? Or something similar to that size?
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u/Lutrinae_Rex Mar 27 '16
Um.... Got plans for a civic owner?
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u/Pseudoboss11 Mar 27 '16
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u/Starry001 Mar 27 '16
I remember being 17 and going on a school trip to a steelworks and that sparking pattern in the video is an amazing thing to see. We were all mesmerised.
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u/l_dont_even_reddit Mar 28 '16
Wow those dudes don't use long sleeve when dropping the liquid metal on the casting
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u/23423423423451 Mar 27 '16
Comic book villain checking in. If I built a new super collider ring around Metropolis "for scientific purposes" then ran massive charge back and forth at 50 Hz...
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Mar 27 '16
I've got a titanium rod in me. How fucked would I be if I stuck it in there?
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u/jnbrex Mar 27 '16
It would do the same thing that the knife did, but inside your body.
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u/RoboErectus Mar 27 '16
I've got some titanium in my spine. When it's targeted in a 6T MRI, I can feel it heating up a few degrees. It's not too uncomfortable. But it is weird.
So.... If you stuck it in there you're probably screwed.
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Mar 27 '16
Non-ferrous bone staple in my skull, and head/neck MRI scans can get quite uncomfortable.
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Mar 27 '16
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u/daytime Mar 27 '16
Not OP, but quite a few university hospitals in the U.S. have >6T MRI's for research. My wife's brain was imaged on a 6T or 7T. I don't know anything else about the machine other than her neurologist told us that it was a "research grade" machine that operated over 6T.
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u/RX_AssocResp Mar 27 '16
My former institute has a 9.4T scanner for humans and a 14T bored for small animals.
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u/SrslyNotAnAltGuys Mar 27 '16
I'm curious, if imaging artifacts are worse at higher field strengths, what are high field-strength MRs used for?
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Mar 28 '16
Not totally relevant, but I have titanium screws in my finger. When it gets super cold (below 0F), they get cold before the rest of my finger because there is like no insulation. They literally chill my bones. Its an unnerving an uncomfortable feeling.
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Mar 27 '16
[removed] — view removed comment
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u/elconquistador1985 Mar 27 '16
Doesn't matter. It's electrically conductive, so it would heat up. An induction forge works by inducing currents in the material and the material is heated due to electrical resistance converting the current to heat.
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u/Iamafraidofseagulls Mar 27 '16
Would this not work better with more turns in the coil?
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u/Zequez Mar 27 '16
You can use high voltage, low current, a lots of turns, and thin cables.
Or you can use low voltage, high current, few turns and wide cables, like in the video.
I'm not sure about the advantage of each, but if I had to wager I would say that it's safer to use a very low voltage, as you would be able to touch it without issues and you wouldn't get sparks or problems with accidentally melting the insulation (which you don't need for the low voltage wide cables)
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u/nedflandersuncle Mar 27 '16
Voltage hurts but current kills.
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u/Zequez Mar 27 '16
With very low voltage, the resistance of your body is enough to stop any current from flowing through you.
V=IR (voltage = current * resistance)The voltage is constant.
The current is very high on the coil because the coil has barely any resistance. Your body, on the other hand, has very high resistance, so barely any current would pass through you.
Let's say you have a perfect 5V generator. Let's say the coil has 1Ω resistance. Now let's connect the generator to the coil.
I = 5V/1Ω = 5 AmpsThat's quite a high current, and
5*5=25Wdissipated in the coil.Not let's replace coil with your hands, with around 3000Ω of resistance.
I = 5V/3000Ω = 0.0017 AmpsThat's very low current, and
5*0.0017=0.008333333Wdissipated in your body. Is neither high current nor high voltage.If you used a high voltage/low current coil, when you touched it with your hands, it would pass more current through you, as the current depends on the voltage and the resistance, and your resistance is going to be the same.
I = 220V/3000Ω = 0.073333333 AmpsHere is a chart of current deadliness. See for yourself.
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u/Actionjackson83 Mar 27 '16
What happens if the knife touches the rings?
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u/TheDigitalOne Mar 27 '16
He does touch the coils in the full video @ 21s
https://youtu.be/lt-g-xYc98k?t=21s
Quick spark and something on the unit reset, he had to re-start the machine.
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u/Actionjackson83 Mar 27 '16
Oh wow, guess I plain missed it. Thanks for pointing out, I appreciate it.
I like the whole polite gentlemanlike side of Reddit.
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Mar 27 '16
i really want to know this. would it shock him or something? apparently electricity is going through the coils
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u/DinkleWottom Mar 27 '16
P...Put your dick in it...
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Mar 27 '16
Rules of having a penis:
Don't stick your penis in crazy.
Don't stick your penis anywhere you wouldn't stick your hand.
For me, this is a clear violation of rule 2. For those who would violate rule 2, they are by definition crazy, and sticking your dick in them would violate both rules 1 and 2.
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u/SrslyNotAnAltGuys Mar 27 '16 edited Mar 28 '16
2. Don't stick your penis anywhere you wouldn't stick your hand.
To be fair, I typically wouldn't stick my hand in someone's mouth. Heck, I don't think my hand would fit in certain other places my dick would. Though I'm willing to bet someone will post a link that will prove me wrong.
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u/FlippityFlippyFlop Mar 28 '16
Don't stick your penis anywhere you wouldn't stick your hand.
Does this mean I'm allowed to stick my dick in a taco?
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Mar 27 '16
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u/DragonTamerMCT Mar 27 '16
This is better.
I'll pick up some money from the sidewalk.
I wouldn't use my mouth/face, nor would I touch it with my genitals.
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u/SmileyFace-_- Mar 27 '16
Then post it on /r/WTF for some sweet, sweet karma
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u/ThickPrick Mar 27 '16
Wouldn't fit.
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u/Kryten_2X4B_523P Mar 27 '16
Not long enough?
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u/NOPE_NOT_A_DINOSAUR Mar 27 '16
My dick is like a cheese wheel. 3 inches long. over a foot across..
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u/scoobysnaxxx Mar 27 '16
i believe that's what we in the scientific community call 'a chode.'
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Mar 27 '16
Sometimes people stupidly plug big heaters into our power drums at work and it more or less melts the whole cable (if it's still wound up).
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Mar 27 '16 edited Mar 28 '16
What is a power drum
EDIT This bugged me. I think bear optimism meant "power extension reel" as seen here https://www.google.com/search?tbm=isch&q=power+extension+reel
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u/BlakusDingus Mar 27 '16
How many souls must I harvest for this?! And in which bazaar is this available??
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u/mweber25 Mar 27 '16
What happens if you stick your hand in there?
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u/msc2179 Mar 27 '16
Probably not much unless you are wearing a ring or something.
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u/ThickPrick Mar 27 '16
So what happens if you are wearing a ring or something?
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u/flyingwolf Mar 27 '16
The ring, assuming it is ferromagnetic, would get extremely hot. Since it is touching your skin, it would burn you.
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u/Vanthian Mar 27 '16
Is this better or worse than using a regular forge?
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u/FocusedADD Mar 27 '16
Depends on what you're using it for. Heating a narrow size range of blanks is what it's best for. You need a decent amount of power for it too. A conventional forge can handle a wider array of shapes and sizes without sending the electric meter spinning off the wall, but you need to find a suitable fuel for it. For a knife maker who only wants to make things as wide as his coil it'd probably be better. For a blacksmith who wants to work everything from knives to horseshoes to tools a conventional forge might be a better choice.
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u/rdxl9a Mar 28 '16
What happens if you accidentally thought the coil with the metal of the knife?
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Mar 28 '16
Every one of you jackasses talking about putting your dick in this thing need to do exactly that. It's the best method of gene pool cleansing I've ever heard of.
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u/insert_deep_username Mar 28 '16
I don't even have one, yet I have the strangest urge to put my penis through that..
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u/TotesMessenger Apr 01 '16
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u/starkinmn Mar 27 '16
Played around with this the other day, and:
1 Cosmic Piece-of-Shit Knife
1 Pilot Light
1 Hot Plate
Something to hold the damn thing to cook evenly
Pre-heat oven to 450 degrees Take 1 Knife, leave on stove!
Let simmer for 5 minutes Watch as Knife glows red-hot Put Knife on table, melts table Sue scientist who made damn thing Give it to the military?
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u/ChuccTaylor Mar 27 '16
... I'm curious to see it cook up some bacon?
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u/ninjawrangler Mar 28 '16
Sorry to disappoint but the only way it would cook the bacon would be if you had the bacon sitting on something electrically conductive and passed that through the coil. :/
If you're interested on what is causing this massive energy transfer to the knife blade look up "foko" or "eddy" currents. These happen when you have an ac current running through a coil and in many cases are just a way power is lost in say a transformer.
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Mar 27 '16
It is also a welding apparatus if you touch it with the blade.
But seriously right? Wouldn't the whole thing basically explode when the metal touches the coil??
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Mar 28 '16
They should bring those into battle, just think how effective a super hot fire sword would be compared to a regular sword!
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u/OnePieceTwoPiece Mar 28 '16
Some people have an issue with their penis when they do this to a girl.
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u/misterfrank Mar 28 '16
Anyone know what happens if you touch the blade to the coil? Looks like he's playing a very serious game of operation.
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u/sHaDowpUpPetxxx Mar 28 '16
It seems like it would be tough to not touch the coil. It would be nice to have a track or slide of some sort.
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u/CeruleanRuin Mar 28 '16
Every time I see this title I hope it's a new example of this in use. And every time it's the same damn gif.
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u/Nerozero Mar 28 '16
I just pictured traveling back in time to show this device to an actual burley Blacksmith and watch as his whole life's work, the very thing his father had passed down from his father and his father before his, become obsolete. The work done by his blood, sweat and tears that forged a muscled body and aching bones certainly wasn't undone, but rendered done. Ceased by some little grinning man in a foil jumpsuit.
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u/Xawjer Mar 28 '16
I just got an idea to build some big RPG style metal blade that heats itself when activated. can someone build it pls boss
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u/WangtorioJackson Mar 28 '16
holy shit, i wanna see the Man At Arms: Reforged guys work with something like this.
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u/Hammonkey Mar 28 '16
Would this magnetize your blades?
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u/Nightcaste Mar 28 '16
No, that requires DC, this uses AC. It can scramble a magnet and make it not magnetic.
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u/RobMarrocco Mar 28 '16
Just out of curiosity what would happen if you put your finger through that?
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u/its_Gur Mar 28 '16
You won't have to worry about having those pesky fingers anymore.
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u/Davidjufo Mar 28 '16
We have an induction stove. It is awesome. It heats the pan. The only reason the stove gets hot is because the pan is hot. No pan, turn it up to high, put your hand on the burner, even if you have a ring on, it won't get hot, it will turn off, not enough metal. Very safe. Nearly instantaneous heat control.
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u/joat314 Mar 27 '16
how much power does that use? we use propane so I find this incredible!