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Knife Thread

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Unread postAuthor: Brian the brain » Sun Sep 04, 2011 3:15 am

Hmm...pneumatic-ballistic bajonet.......
That would be a cool addition to any project...

I guess you'd be a hit on youtube....
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Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: jackssmirkingrevenge » Sun Sep 04, 2011 3:39 am

here's a brain fart, a "valveless" launcher that could fire an unmodified knife with an appropriately shaped handle silently...
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a more "conventional" coaxial version with a thumb trigger
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Unread postAuthor: jakethebeast » Sun Sep 04, 2011 5:33 am

jsr, what kind of attaching method you are going to use? just thinking that what kind of tang im going to forge to it...
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Unread postAuthor: jackssmirkingrevenge » Sun Sep 04, 2011 5:34 am

Is it possible to have a short cylindrical one?
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Unread postAuthor: jakethebeast » Sun Sep 04, 2011 5:36 am

thin and round you mean? just thinkign that the balde is going to be like 5mm thick from the thikest part so it would be pretty weak spot... our ballistick knife has m5 thread on the tang but i dont know if the powerfull penumatic version would hold it so well...
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Unread postAuthor: Zeus » Sun Sep 04, 2011 5:39 am

JSR, it would indeed fire the knife, but it would absolutly f*** the blade. My L1A1 bayonet was used as a throwing knife by some fool, it's got a horrid ding in the blade and the tip won't sharpen well anymore.

I hold onto the bayonet as it's the closest I'll get to owning a L1A1, unless I become a dual citizen and hang around MrC 6 months in the year.
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/sarcasm, /hyperbole
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Unread postAuthor: jakethebeast » Sun Sep 04, 2011 5:44 am

it depens of the material, heat treatmen and tempering of the blade :D
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Unread postAuthor: jackssmirkingrevenge » Sun Sep 04, 2011 5:48 am

jakethebeast wrote:thin and round you mean? just thinkign that the balde is going to be like 5mm thick from the thikest part so it would be pretty weak spot... our ballistick knife has m5 thread on the tang but i dont know if the powerfull penumatic version would hold it so well...


I can have it threaded? :D a short length of M5, say about 2 cm, sounds about perfect. Remember that this part won't be under any real stress with a lightweight synthetic tail.

Give me a couple of minutes and I'll draw up a diagram.

it depens of the material, heat treatmen and tempering of the blade


... and what you're throwing it at, and how good you are at it - if you're shít and been practicing over hard floor, well...
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Unread postAuthor: inonickname » Sun Sep 04, 2011 5:49 am

jakethebeast wrote:thin and round you mean? just thinkign that the balde is going to be like 5mm thick from the thikest part so it would be pretty weak spot... our ballistick knife has m5 thread on the tang but i dont know if the powerfull penumatic version would hold it so well...


For a knife that's made to be shot I'd use thicker spring steel (at least 6, preferably 7 or 8mm) with higher grind angles and duller edges. Only the point needs to be particularly sharp. Temper it to only moderate hardness to prevent chips/cracks. I wouldn't bother with a good finish either, if you fire it, it's going to look like trash.

And JSR, tang length is basically irrelevant, the point where the blade reduces down to the tang is a massive weak spot due to the amount of moment (torque/leverage) the blade has on it, and it's small diameter. It needs to be beefed up, especially for a ballistic knife.

Edit: Hmm, didn't think of the light weight of the tail. I'd still go with thicker spring steel for the blade. Don't have any? Well cut up a leaf spring and beat it flat (either heat it up first or tie a noose for yourself). You will find few steels that are more bastardly to work, but nothings going to damage it. I have a bowie I made from a leaf spring that can be used as a blocksplitter, then used to shave with after. It's hard metal.
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Unread postAuthor: jakethebeast » Sun Sep 04, 2011 5:54 am

yeah i was just thinking to get the blade semi-light, 5mm thick 0.8C carbon steel would be good, its pretty tough steel and the thinckness is ok, and of course with very high grind angle, but still razor sharp

EDIT: yeah i have 150cm x 3cm x 10cm truck leaf spring, im just lazy :D
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Unread postAuthor: jackssmirkingrevenge » Sun Sep 04, 2011 6:09 am

This is how I picture it:
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Unread postAuthor: jakethebeast » Sun Sep 04, 2011 6:13 am

that blade is pretty wide, so if i make it that way it would not be strong enough... let me draw you a picture...


EDIT: nah, with my drawing skills that was impossible :D but you see, the dagger blade in your picture has pretty low grind angle, so its not strong enough... the attaching metod i was thinking was to weld a piece of m6 thread to serve as tang, that would be soft material and it would hold pretty well...
to get enough high grind angless, i need to sand them, forging so high angles is very hard
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Unread postAuthor: inonickname » Sun Sep 04, 2011 7:04 am

jakethebeast wrote:that blade is pretty wide, so if i make it that way it would not be strong enough... let me draw you a picture...


EDIT: nah, with my drawing skills that was impossible :D but you see, the dagger blade in your picture has pretty low grind angle, so its not strong enough... the attaching metod i was thinking was to weld a piece of m6 thread to serve as tang, that would be soft material and it would hold pretty well...
to get enough high grind angless, i need to sand them, forging so high angles is very hard


Agreed, the angles in the FS (that probably play a big role in making it an appealing blade to you, JSR) are shitty for a throwing/ballistics knife. If you look at grind angles on throwing knives they're really high, like so:

Image

You really need those high angles for any kind of impact. Good news is grinding them is quicker and easier than big bevels (but like Jake said, you basically can't forge them).
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Unread postAuthor: jackssmirkingrevenge » Sun Sep 04, 2011 8:43 am

Hmmm... That shape isn't very appealing though.

How about something like this?

Image

Remember this is travelling head first, unlike a normal throwing knife.
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Unread postAuthor: jakethebeast » Mon Sep 05, 2011 3:50 am

That looks that it could take some beat, and looks like easier to make :D
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