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Discussion & Design of Mechanics for Automatic Bladed Weapons & Exotic Gear
 
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 The Assassin Extension Knife

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SINZA
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PostSubject: The Assassin Extension Knife   October 15th 2008, 2:44 pm

First topic message reminder :

I'm going to start a new post for this new weapon design.
PLEASE KEEP THIS POST ON TOPIC. DISCUSS THIS DESIGN ONLY PLEASE.
We seem to have so many it just gets worse when they are mixed together.

..................................................................................................................

Recieved my 'Assassin's Extending Knife' in the mail today.
It was $135.00 + $10 to have it sharpened.

Description:
The Assassin Extension Knife locks into place with a simple slide.
A release button allows it to slide and retract.
Attaches easily to your Assassin vambrace.
Overall: 19-1/8"
Wt: 1 lb/4 oz
Blade: 9" long, 5/8" wide, 3/16" thick

Buy it here:
http://www.atlantacutlery.com/atlantacutlery/detail.aspx?ID=1946
or
http://www.windlassstudios.com/p-76-assassin-extension-knife.aspx

Here it is out the box...smells like oil.


Closed


Extended


The blade and sleeve.


Close up of the blade. Rounded tip to be a safe prop....it's a easy fix on the belt-sander.


The sleeve and front.


Here's the button lock. Very simple, this is all you really need guys!!



Opened up. Here's what you guys have been waiting for!!!! And it's simple!









How the flex cable is attached to the blade.


How the sleeve is attached to slide plate.


But how does it all work?!?!?! So simple....


It's so basic it's almost embarrassing.
If this is the first of this design I'd love to see really nice version made really strong.
It's great for what it was made for, a costume prop or addition to a collection.
That's why it has a rounded tip. It would be easy to make it a sharp point on the belt sander if you wanted.
I can't see it taking too much abuse before it broke or bent.
As it is it came without the lock spring, so I had to open it up to fix it with one of my springs.
Not a real big deal, but I wasn't happy about it until it was fixed.

It's a little big...but looking at it I really think it could be done without the top half of the 'box'.
If you re-positioned the lock this might be able to be made half thickness. That would make a big difference.

Can it be made automatic? Semi-automatic?

Maybe.
I could see a few different ways of redesigning this, maybe with springs....maybe with a lazy-tong...or both.
The cable and pully extension system is so simple, it's how our curtains used to work as a kid.

Is it worth the money?!?! That is up to you to decide. I know I'm happy I have one!!

O.k......did I cover it all??? Any questions??

Now....on to the redesigns and the project builds!!!!


Last edited by SINZA on November 26th 2009, 2:04 pm; edited 3 times in total
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Meekl
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PostSubject: Re: The Assassin Extension Knife   December 11th 2009, 8:51 pm

Oh damn, this is so easy and I've been ripping my hair out trying to get a good design.
TO THE ERECTOR SET
AWAAAAAAAAY
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PostSubject: Re: The Assassin Extension Knife   December 12th 2009, 6:16 am

S3kShUn8 wrote:
i dont understand how it retracts...

I dont too. I made this last year Laughing Laughing Laughing Laughing
and I really dont know how this could retract. my theory back then, was
when you pull the string, it pushes the spring and the blade away, but then when you stop pulling the string, the spring would then pull the blade back.
then after 5 days, I thought that this was impossible. so
I was just sharing my ideas.

I gave up my spring system now, coz it really takes up a lot of space. I dont know where to buy that in france; this one:
XXXXXXXXX=====>
the XXXXXX thing which becomes kkkkkk when retracted.

I dont know the term too in english. Very Happy Very Happy Very Happy



Edit: I really dont know where to focus on, the AC1 blade which uses the xxxxx something, or the AC2 blade which uses a pulley.


Last edited by Sylvos Srigo de Marseill on December 12th 2009, 6:19 am; edited 1 time in total (Reason for editing : pulley vs XXXXXX)
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PostSubject: Re: The Assassin Extension Knife   December 12th 2009, 6:45 am

for future reference the xxxxx thing is called scissor jacks Very Happy
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PostSubject: Re: The Assassin Extension Knife   December 12th 2009, 8:37 am


this one
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PostSubject: Re: The Assassin Extension Knife   December 14th 2009, 2:30 am

@qwertyui0
I'm late to the party, as usual, but I thought I'd say that looks very nicely done. Excellent work!
thumb up
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PostSubject: Re: The Assassin Extension Knife   December 17th 2009, 5:36 am



Hello everyone!
What does you think about this idea?

1. pull the ring-string 3cm out
2.the blue disk turns one complet turn
3. and pulls at the second cable
4. that cable moves then the black extention
5. the black extention presses the red knife out
6. a spring of a clockwork turns the blue disk back on the first position and takes the cable and the extention with it

i know there is no lock to keep the knife out, but this is just a functional diagram.
The arm is there for see the size (compact 150mm / extended 450mm

and sorry, its a bad picture

please, tell me what you thinks.
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PostSubject: Re: The Assassin Extension Knife   December 17th 2009, 5:38 am

oliver84 wrote:


Hello everyone!
What does you think about this idea?

1. pull the ring-string 3cm out
2.the blue disk turns one complet turn
3. and pulls at the second cable
4. that cable moves then the black extention
5. the black extention presses the red knife out
6. a spring of a clockwork turns the blue disk back on the first position and takes the cable and the extention with it

i know there is no lock to keep the knife out, but this is just a functional diagram.
The arm is there for see the size (compact 150mm / extended 450mm

and sorry, its a bad picture

please, tell me what you thinks.

Seems too...can't think of it...complex? No... Embarassed
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PostSubject: Re: The Assassin Extension Knife   December 17th 2009, 9:41 am

seems like it would work, on paper at least. wouldnt the amount of effort needed to pull the string tho be too great?
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PostSubject: Re: The Assassin Extension Knife   December 17th 2009, 3:48 pm

Hellow, i'm new since today

What you guys made are just hallucinating AWESOME

what buzzes me is the AC2 Da Vinci revised hidden wrist blade, it seems very possible and prone to retract, i guess its do-able

About the retracting my dad maight have found a way to make it retract using the design you got (AC1 syle), we gonna test it ourselves first

i remember from a 'Baki the grappler' manga, that there was a guy who had blades implanted under his skin and could retract them using a different finger movement combination than the one to make them extract, what i thought off, it since most of you have the ring to pop the blade out, is use a second ring to make the blade retract...

Sorry but I know more about guns, than blades


Last edited by Berkenbeek23 on December 17th 2009, 4:13 pm; edited 2 times in total
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PostSubject: Re: The Assassin Extension Knife   December 17th 2009, 3:57 pm

Arrrggggg

Bash

slap

No
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PostSubject: Re: The Assassin Extension Knife   December 20th 2009, 1:22 am

Arrrggggg stupid troll
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PostSubject: Re: The Assassin Extension Knife   December 22nd 2009, 12:29 pm

Doudomida wrote:
would there be any way to make the bit that extends the blade, be able to be connected to wire which connects to a ring you could have around your finger and depending on how far you would bend your hand back, the more the blade would come out? and then when you relaxed your hand the blade retracts back since the wire is being retracted due to your hand being bent back to its proper position

(sorry if this has already been discussed or if my wording seems a bit muddled) bacon

That would work but during combat you would want full control of your hand so you would want it to be lockable out and in. I am working on some plans over Christmas (I haven't got anything else to do). I have some basic ones but I can only extend it automatically and lock it out. I will upload the plans when I get the chance.
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PostSubject: Re: The Assassin Extension Knife   December 26th 2009, 1:49 pm

SINZA wrote:

Here it is out the box...smells like oil.


Closed


Extended


The blade and sleeve.


Close up of the blade. Rounded tip to be a safe prop....it's a easy fix on the belt-sander.


The sleeve and front.


Here's the button lock. Very simple, this is all you really need guys!!



Opened up. Here's what you guys have been waiting for!!!! And it's simple!









How the flex cable is attached to the blade.


How the sleeve is attached to slide plate.


But how does it all work?!?!?! So simple....

i don't understand the mechanism..... can you make a video where you disassemble and build it?

sorry but im new to these mechanisms Rolling Eyes
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PostSubject: Re: The Assassin Extension Knife   December 27th 2009, 12:54 pm

Hello everybody
I'm new to this site. I found it during my search for information on the hidden blade used by Altar in "Assassins Creed"

I'm trying to build a blade myself, so this site is realy usefull Very Happy

When it's done, I'll post the result :)
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PostSubject: Re: The Assassin Extension Knife   December 27th 2009, 1:19 pm

Welcome, glad you found us.
Let us know how we can help. Show lots of pictures when you can.
Enjoy
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PostSubject: Re: The Assassin Extension Knife   December 27th 2009, 2:52 pm

i don't understand the hidden blade mechanism.
can you make a video or more detailed photos of each piece with the instuction please?
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PostSubject: Re: The Assassin Extension Knife   December 27th 2009, 3:17 pm

I heard ya the first time.

I don't know how more detailed the pictures could be. I've shown everything.
I'll have to dig it out, it's in a zip case in one of my weapons drawers.
Sometime this week I'll try and open it up and make a video of it opening and closing.
Look at the labled picture again.
The SLIDE is moved back and forth by a knob.
Inside the SLIDE sits a BLADE attached to a CABLE. The CABLE is fixed to the CASE wall.
Move the SLIDE forward and you also move the BLADE and CABLE.
As the CABLE is moved forward it pulls the BLADE forward in the SLIDE.

So...Move the knob forward it moves the slide which pulls the cable which moves the blade. Understand?
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PostSubject: Re: The Assassin Extension Knife   December 27th 2009, 3:53 pm

yes i understood that, but i don't understand how the button activates all this mechanism. sorry if i'm so insistent, but i'm really ignorant!
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PostSubject: Re: The Assassin Extension Knife   December 28th 2009, 11:02 am

don't matter, i finally understand how it works Wink
thank you
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PostSubject: Re: The Assassin Extension Knife   January 1st 2010, 7:54 pm

Hey every one!!! :)

As many other people posting in this thread, I am new, I'm very interested in crafting a wristblade like the ones in the AC saga, although in my current situation, I don't have the means to do so, I hope to change this soon.

I have a couple of suggestions for people looking to craft a wrist blade.

1. In designs (primative schematics) I have thought up, the problem which kept slapping me in the face was that the hand movement to release/retract is restricted to being very brief, I think this issue could be solved by using what I would refer to as "Movement maximization" or just "Acceleration", by this i mean... Revolving a cog, 3cm in circumference by pulling it round 3cm, which then revolves a cog, 10cm in circumference, which then pulls/pushes the blade 10cm.

2.Using R/C motors that coast backwards, so the blade can be sring sprung, and then retracted with the motor.

2.2 - I understand that the speed in which the blade is deployed/retracted is a factor for some people, but I've yet to find a better solution.

3. Two switches/catches - in addition to a string pulled by your hand moving backwards, you could have a string down the back of the hand guided by tubing that then pulls another switch/catch/cog. as in the AC games the blade is depolyed by the hand tensing/pulling back, and retracted by the hand moving inwards, which would suggest a similar system?


Apologies if I acidentally revisited old ideas, or missed flaws in these ideas.

Also, I have been VERY impressed by some of the content on this forum, I've been baffled. This is probably the most amazing website I've ever visited.

Thanks,
Smiles.
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PostSubject: Re: The Assassin Extension Knife   January 1st 2010, 10:21 pm

Hey all, just discovered the site and wanted to throw my two cents in.

I'm not really sure if any of the following could even be done, but I figured sharing it couldn't hurt. Like with most of the gravity-based designs, it seems as though the way to extend the blade is by a flick of the wrist. A moderately stiff spring could be attached to the base of the blade (or a stronger support for the blade) and to the base of the housing. The spring would be strong enough to keep the blade retracted, but would have enough give that the blade could "slide" out with a sufficiently strong flick of the wrist (I'm assuming that the blade would be attached to a slide of some sort). Upon extending, the base of the blade would pass a pair of locks on either side of the front of the housing, locking the blade in place. I figure with two locks, one on each side, more stability would be provided.

Retracting it would require using the pull-string concept that most of the concept art depicts. Since the spring is stretched, it'll naturally want to constrict and draw the blade in. The pull-string could be connected to the locking mechanism(s), and pulling the string would pull the locks back, allowing for the blade to retract. The spring would pull the blade back fairly quickly, without having to manually move it backwards. And if the spring isn't tight enough and allows the blade to move somewhat without flicking the wrist, a small magnet at both the base of the blade and the base of the housing could provide some extra security.

Anyways, that just an idea that I've been throwing around. I haven't got much experience at any of this, some any constructive criticism would be excellent. Apologies if something like this has already been posted, I don't want to go stealing ideas (even if I've never read them). Oh, and thanks to Sinza for creating a forum like this, it's really fantastic to see so many people with great ideas brainstorming. Gives me some hope for the future transformer


Last edited by LordThanatos3 on January 1st 2010, 10:52 pm; edited 1 time in total (Reason for editing : Added Image)
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PostSubject: Re: The Assassin Extension Knife   January 1st 2010, 11:45 pm

Hey LT3, welcome to the forums. Yet another great simple assisted retraction gravity Xiphoid. It could most certainly work, though without any kind of retraction lock, it'll move around a bit when you move, and be noisy when retracted, but I like the basic idea.

Nice idea!
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PostSubject: Re: The Assassin Extension Knife   January 2nd 2010, 6:07 pm

Thanks for the welcome! And excellent points about the rear locks and the noise. The noise could potentially be reduced by having some padding of some sort at the base of the housing. There's also the option of having the rail that the base of the blade is housed on be an action-assist rail. Which basically is a rail that, when pushed beyond a certain point (either opening or closing the rail), helps to fully open or close the rail. So in theory, this could slow the blade down upon retraction (but if the spring is too rigid, it might overpower this design anyways).

As for the rear locks, I'm not quite sure how to work that out. I figure the locks would be spring-assisted and would automatically pop into the cutouts at the base of the blade/base once it passes the point. And they could be retracted upon pulling a string attached to them, which would then free the spring up to pull the blade back in. I suppose a similar set of locks could be used at the base and attached to the same string. Luckily, the locks at the base would just need to hold the blade back. The lock design at the front would need to both lock the blade and provide sufficient support so that a stabbing motion wouldn't break them.

And I just realized that the locks in the illustration I made before need to be inverted, along with the cutout in the blade, for it to work the way I intended. Hmm... Arrrggggg

But thanks for the suggestions! It's always good to have somebody else looking at your work, they tend to pick up everything you miss. Cheers!
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PostSubject: Re: The Assassin Extension Knife   January 2nd 2010, 8:30 pm

Hey once again, I decided to make a very brief diagram of my idea suggested above.

Here it is, Crude and simple.

Quote :
1. In designs (primative schematics) I have thought up, the problem which kept slapping me in the face was that the hand movement to release/retract is restricted to being very brief, I think this issue could be solved by using what I would refer to as "Movement maximization" or just "Acceleration", by this i mean... Revolving a cog, 3cm in circumference by pulling it round 3cm, which then revolves a cog, 10cm in circumference, which then pulls/pushes the blade 10cm.

ttfn!
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PostSubject: Re: The Assassin Extension Knife   January 3rd 2010, 2:00 am

@LT3
Glad to help...

@Smiles
Yes, this would work. In fact this compound pulley design has been implemented on several of the xiphoid schematics already on the site.

Come on people, especially the new members, please at least READ THROUGH THE FORUMS before you post!!! At the very least, read through the AC blade threads, and the SAW blade threads, any threads related to what you want to build should be the *BARE MINIMUM* that you should be reading through, and looking at existing schematics, BEFORE posting.

There are too many of you trying to reinvent the wheel, or, in this case, pulleys, and you do both yourself and us a disservice by not doing even the minimum due diligence.

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PostSubject: Re: The Assassin Extension Knife   January 3rd 2010, 6:38 am

Sorry Phyre, I am trying to read through them all, but I only signed up yesterday, and I haven't had time yet.
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PostSubject: Re: The Assassin Extension Knife   January 3rd 2010, 12:35 pm

No problem, Just make sure you read through all the relevant threads, and perhaps a few of the less relevant threads, :) before you start asking questions. Very Happy
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PostSubject: Re: The Assassin Extension Knife   January 3rd 2010, 10:02 pm

Hey guys, I'm new to the forum/site also and I'd like to say wow. All these ideas are amazing and completely beyond what I could dream of thinking/doing/making.
I am starting to try to make my own hidden blade. I have a stopping mechanism for when the blade it comes out but it doesn't hold for much pressure. My paint skills suck so I probably can't make a plan and I have yet to find a good ball bearing slide for it (I'm looking for a good 8.5-9" slide for my concept as the one I am using right now is 12"+ which is way too big).
I'm not too good at mechanics but my idea should work and it's pretty solid. Also if anyone could find were to buy a cheap gauntlet (doesn't have to be related in any way) I'd be very grateful Wink
Anyway I enjoy the forum and I have really enjoyed readong over your posts and ideas and i'm hoping some of them will spark an idea into my head haha.

~~Axel~~
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PostSubject: Re: The Assassin Extension Knife   January 5th 2010, 3:50 am

uh.... can a mechanism the when you pull the string a little tiny gear like thing turns and locks onto a little point then when you pull the string again it reverses and lock.. ill try to find or make a piicture of what im talking about i dont know it might be to complicaed or something just ya know hope its a good idea :/ beat Yeah that
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PostSubject: Re: The Assassin Extension Knife   January 6th 2010, 6:46 pm

@Axel
Once you can find a decent slide, things should be a lot easier. And if you're looking for help on a decent locking mechanism, check out Nightshade's xiphoid. His design could easily be modified to include a slide, and his locks are among the simplest, easiest to understand, and seemingly most effective that I've seen on the site.

Unfortunately, most of the gauntlets/vambraces that you'll find on the internet are pretty overpriced. Your best bet is to make your own. Once you find a place that will sell you decent leather, all you need to do is use google and skim through some of the results until you find decent instructions. There are far more results for making gauntlets or other leather armor than there are for making xiphoids and other cool weaponry. Plus, you can show off your own handiwork. Everything is cooler when you make it yourself! Hope I helped a bit. sword
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PostSubject: Re: The Assassin Extension Knife   January 7th 2010, 2:30 pm

Excuse my mechanical ignorance here, but would it be possible to adapt a double action OTF spring system to the pull ring used like in Assassin's Creed or would it only be useful as either extension or retraction?
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PostSubject: Re: The Assassin Extension Knife   January 7th 2010, 3:13 pm



Last edited by SINZA on January 8th 2010, 2:13 pm; edited 1 time in total (Reason for editing : Because I was a ass and I need to be better than that.)
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PostSubject: Re: The Assassin Extension Knife   January 7th 2010, 3:20 pm

Apologies for the extra stress. And to make you feel better, I did try looking. I just seem to go blind when the answer is right in front of me. *shame*
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PostSubject: Re: The Assassin Extension Knife   January 7th 2010, 3:59 pm

Dont take it all on you, you just happen to be the straw that broke the mules back.

This has been happening for a long time, I probably did it once when i first started. Granted there was far less information, but i didn't have all of the tools you have now.

When I first started I read every sticky post, and at least skimmed over all of the others. I may have missed a couple things, but at least i saw all of the diagrams and schematics. If I saw a diagram i didn't understand, I read the posts following so that i could understand it.

This way it prevented myself from asking the completely obvious questions. I may have asked a question that had already been answered, but it wasn't one that was right in front of my face but deep within the forum.

So in short, do your research
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PostSubject: Re: The Assassin Extension Knife   January 7th 2010, 9:53 pm

Yeah that
If in doubt, just do what I did: browse pretty much every thread that looks as though it has something to do with what you're thinking about. Just because somebody might be looking to do an AC hidden blade, doesn't mean that they can't find great ideas and information from things like the Predator or Saw threads. So just read. It's like building one of these things, you can't just expect instant gratification. It takes work.
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PostSubject: Re: The Assassin Extension Knife   January 8th 2010, 6:19 pm

http://www.youtube.com/watch?v=bMlnBXCBqXA


Video of the previous blade, now with some improvements. It still misses the release and locking mechanism. Any suggestions on how to do that. Got something planned out though, just have to experiment.
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PostSubject: Re: The Assassin Extension Knife   January 9th 2010, 2:19 pm

Very cool, man! Even without the locks it looks like a really solid piece of work. Do you have any stills, diagrams, or a parts list or anything? Even if you don't, I really like the length of it. It kinda looks like the two stage extension system that the original AC hidden blade used. But from a purely aesthetics standpoint, that's pretty kickass. Let us know what other kind of mods you plan on doing with that thing. Once you get some locks on it, it'll be even cooler. cheers
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PostSubject: Re: The Assassin Extension Knife   January 9th 2010, 8:17 pm

Wow man, bravo cheers I would also like to see some diagrams or schematics, thats beautiful. I would like to make one of my own, and add a few improvements...
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PostSubject: Re: The Assassin Extension Knife   January 9th 2010, 10:00 pm

Nice, Im sorry I have not been posting for a while I have been doing alot of work around my house didnt have much time for the computer but I was looking through all the things people have posted up and the post has come a long way since I first asked the question so thanks everybody for not abandoning this post

p.s. sorry for the spelling just got a new keyboard :) its wireless :)
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PostSubject: Re: The Assassin Extension Knife   January 11th 2010, 8:21 pm

I went out and bought a heavy duty steel dresser or whatever slide:




The one I bought comes in three parts and slides by using ball bearings

I also bought some springs:



Im trying to make one like that beauty in th youtube video a few posts ago, but I see it has a pulley system, so some guidence or schematics would help
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PostSubject: Re: The Assassin Extension Knife   January 11th 2010, 9:57 pm

I think all you have to do to make this a good hidden blade is find a way to put an attachment on to the extension knife that lets you press the button on the side by a motion with your pinkie. It wouldn't be that hard. Maybe this is as good as it gets...
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PostSubject: Re: The Assassin Extension Knife   January 11th 2010, 11:31 pm

@Stormevans: Are you planning on building an auto-out manual-in? And a three part slide is fantastic considering the majority of the AC1 art and stills feature a mechanism with three distinct 'sleeves'. With some toying and creative metalwork, you can make it look pretty game-accurate. But good start, keep us updated. One of these days I'll actually give in, go to the hardware store, and buy some materials and actually do something.

@Podrocket: Would the pushbutton be used with an SA OTF, a DA OTF, or something else? And the whole idea of a pushbutton was thrown around in early concept art by the developers, but was discarded later in favor of the pull-string. A pushbutton would be cool, but I'm screwing around with my fingers right now and it doesn't seem very smart. The pinky can barely reach back to where the mechanism would be placed, and when it does finally reach, it sort of brings your ring finger directly into the line of fire. Which would be ok for Altair, but I prefer to keep all my fingers Razz It'd be fine if you used your other hand, but that might eliminate the whole stealth aspect of it. But any idea is a good one! Until you start losing appendages... Philly nilly
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PostSubject: Re: The Assassin Extension Knife   January 12th 2010, 3:46 am

This was the youtube video that happened to have a link to this site, and I sort of fell down the rabbit hole into wanting to make a wrist blade for the fun of it:
http://www.youtube.com/watch?v=fNZR9lM7DZI&feature=related
The way the person puts it, it's just a large scale version of an OTF blade. I almost think it could be interesting to figure out a compound OTF where when the sleeve is pushed out, it hits the switch that in turn pushes out the blade. And, in reverse, when the sleeve is made to retract, it moves the switch for the blade the opposite direction to cause it to close completely. For triggering the switch, the person uses a solid piece of metal, which allows pushing their switch either way.
I think it would maybe be possible to use a stable enough wire instead, which gives you a less visible trigger, as well as the ability to shape with simple bending techniques. In any case, I hope I'm not being redundant of any previous ideas.
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PostSubject: Re: The Assassin Extension Knife   January 12th 2010, 5:51 am

yeah that video is on here in several places
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PostSubject: Re: The Assassin Extension Knife   January 12th 2010, 3:26 pm

Well, that aside, what do you think of the idea of a sort of compound OTF blade? I guess I could see it easily becoming too bulky without being streamlined, but I think it's still be possible to make happen.
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PostSubject: Re: The Assassin Extension Knife   January 12th 2010, 8:07 pm

silent kill = plus

its a very intricit design! metal too! still id prefer a more stronger and durable one like this one: http://sinza.forumotion.com/type-4-single-action-automatic-one-way-f16/assassin-railblade-t303.htm
haha that is the most reliable and useful blade i have ever seen. but yes this is nice too for a small disguisable blade yet the other one is more vital and dangerous. with a few disguise and easy pullback mechanisms to the other one and a brachioradialis and wrist underarm flex your hand back with fingers combo... BAM!! ultimate assassination weapon EVA. still this is nice for looks :]
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PostSubject: Re: The Assassin Extension Knife   January 12th 2010, 8:22 pm

[quote="LordThanatos3"]@Stormevans: Are you planning on building an auto-out manual-in? And a three part slide is fantastic considering the majority of the AC1 art and stills feature a mechanism with three distinct 'sleeves'. With some toying and creative metalwork, you can make it look pretty game-accurate. But good start, keep us updated. One of these days I'll actually give in, go to the hardware store, and buy some materials and actually do something.

Cool The idea of a three part system is a little too unstable for the functional use I hope to get out of it, you know, in case I have to use it for "self defense" Twisted Evil lol
What I am aiming to make is an improved version of the one in the video above. I need to cut down my slider to fit my arm length, and buy the blade:

https://www.atlantacutlery.com/p-944-long-double-edge-dagger-blade.aspx

I want it to be a single action out the front that locks into place, with a little knob like handle that can be used to slide it back quickly. I want springs that can efficiently push the balde out and lock it, but are not to hard to pull back and reload

I also want to try to make an over sized OTF with that same blade.. Body out of steel and since i got a new lathe, it should be easy pirat
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PostSubject: Re: The Assassin Extension Knife   January 12th 2010, 10:33 pm

Haha I understand completely. The more articulation points you're dealing with in a mechanism, the greater the likelihood something will go wrong. I figure I'll go for a two part slide. Make a nice mounting base for the static rail, and attach the blade to the slider. And that looks like a nice, solid blade to start working with. Any ideas as to how you'll attach the knob?

I'm assuming you'll be using two tension springs like in the above video? Luckily, since it's manual-in, you'll have a wider variety of springs to work with. The force in the push of a finger is enough to overcome the spring's tendencies to contract. Great ideas so far. Simple and effective, much like the same way I plan on making mine (eventually). And go crazy with that lathe! Looks like your cooking up some badassery over there, brother. thumb up
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PostSubject: Re: The Assassin Extension Knife   January 13th 2010, 7:22 am

As a curiosity question to the more experienced people here, what would be the best spot in these forums for me to get started on something simple along the lines of a wristblade to build, and would it be at all practical for me to try making something out of copper as a prototype before I work with something less yielding like steel?
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PostSubject: Re: The Assassin Extension Knife   January 13th 2010, 7:34 am

Well depends on how you are like some people like to come up with a design, draw it out then build it, others start with something partiallly working and mod it into a xiphiod. Then I just tinker with a pile of random bolts, slides, and knives.

The method of playing with drawer slides is a good start I'm my oppinion. Just cutting it to be the right size, then figure out a release/locking mechanism or use one from another persons design.
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PostSubject: Re: The Assassin Extension Knife   January 13th 2010, 3:45 pm

Now i have added a locking mechanism that releases the blade if turned, it is attached to a spring so if it is turned by pulling in it with a wire it will reset back to normal if the force on the wire is decreased (very similar to nightsade's mechanism).
Also i have installed a mechanism who locks the blade in place when it is fully extended, it turned out well. The pictures are blurry because i only had my phone's camera available. But, it works like this: there are a hinge with pulled springs placed over it, so it always tries to retract, on the one hinge there is a piece of metal with a bolt attach. So when the blade slides all the way out (the bolt always pushing lightly into the blade) it snaps inside a hole (visible on the picture) and goes through the entire slide and blade and locks it tight in place. This mechanism seems very sturdy and fail-safe, while it hinders the sliding just a little. The downside is that it is much more bulky and "high profiled" that alternative designs.


The locking mechanism in a blurry closeup


The entire blade wived from above. I plan to cut down the lever when i am done with the wire pulling system. All tough it is kid of cool to release it by flexing my arm, but it makes the arm hard to maneuver and it is easy to unlock it by accident.


The blade wived from the side, it is more bulky than it might seem now with all the extending and locking stuff Crying or Very sad


The blade extended on my arm so you get an id of it's size relativistic to something
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PostSubject: Re: The Assassin Extension Knife   January 13th 2010, 3:54 pm

Looks great, you made it look like the "three-part folding system" from AC. Cool cool :)

Greets, Athelstan
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PostSubject: Re: The Assassin Extension Knife   January 13th 2010, 6:34 pm

Very Happy Thanks quertyui0 Since the blade I am designing was inspired by yours, those pictures you posted really help.

Once again, bravo on your design cheers
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PostSubject: Re: The Assassin Extension Knife   January 13th 2010, 6:52 pm

Looks awesome, man. That thing's got one hell of a reach too. How stable are those articulation points? I don't mean to be a downer, I'm just interested in how all of these designs hold up, and how increasing or decreasing size would affect the functional stability of the whole thing. But congratulations, that's fantastic if it's your first shot at one. Your locking mechanism is also very unique. And I wouldn't worry about the bulk of this ting too much. Now that you've got a working design (which is the hard part IMHO), you've got the leeway to toy around with it until you have everything the way you want it.

At which point you can suitably taunt all those (like me) who have yet to do something productive. Razz Cheers, brother. rocker
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PostSubject: Re: The Assassin Extension Knife   January 13th 2010, 6:56 pm

LordThanatos3 wrote:
Haha I understand completely. The more articulation points you're dealing with in a mechanism, the greater the likelihood something will go wrong. I figure I'll go for a two part slide. Make a nice mounting base for the static rail, and attach the blade to the slider. And that looks like a nice, solid blade to start working with. Any ideas as to how you'll attach the knob?

I'm assuming you'll be using two tension springs like in the above video? Luckily, since it's manual-in, you'll have a wider variety of springs to work with. The force in the push of a finger is enough to overcome the spring's tendencies to contract. Great ideas so far. Simple and effective, much like the same way I plan on making mine (eventually). And go crazy with that lathe! Looks like your cooking up some badassery over there, brother. thumb up


Thanks man, I cut up the slides today, so thats one thing down. About the knob, You know how that one guy has his tension springs attached to a screw and nut? That would be the place I would put the knob, to reload it simply by pulling the springs back.
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