"Put a switchblade OTF mech in the Assassin's Creed knife"
O.k....I keep seeing this when I do online searches, I keep seeing it here. Go read my post on how a DAOTF works, if you have more questions ask me.

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A double action out-the-front automatic knife mechanism will not work with a extra extention. In my opinion.
I have a bunch of DAOTF''s sitting in front of me, I've taken then apart, put them back together, I understand how it works and is constucted.
I have taken apart most know styles of switchblades, I just don't see it happening.
Let's take a look at how Out-the-front switchblades close, single action and double action, so we have a understanding....
Push or Pull. That's all we have. Unless you want to get into Predator motors and electronics we have push or pull.
1.Pull lever: A small tab at end of blade stick out of the handle. To close unlock and pull back on the tab pulling the blade back reloading the spring.
2. Reload Bar: A pin in the blade is set in a groove in a matal straight bar. To close unlock and pull back on bar this pulls pin/blade back and reloads spring.
3. Double Action. To close slide button downward this extends the spring putting pressure on blade. When button is slid all the way it unlocks the blade and the tensioned spring kicks the blade backwards into the back locks.
4. Gravity: To close tip point of upwards and unlock and blade will drop down into handle.
5. Pressure: To close unlock blade/spike and press against hard surface until spring is compressed and blade/spike locks into closed position.
6. Trapdoor: #4&5 combined- a small spring in bottom of handle. To close let blade drop down and use 'trapdoor' tab to push blade down and reload spring.
So how do you want it to work??
#1,2 would require a pulling back of the blade
#3 will not retract the extention
#4 is not automatic either way
#5&6 are awkward and are not automatic.
There you go. Look at the design and think about it for a bit.


Here's how I think i would build the Assassin's Creed Dagger.
I'd make it just like the picture. A sissor jack at the back to extend the case forward half way. That part is easy, hooked to cable ring
Maybe a slingshot effect to move the extention forward, springs either inside the extention or under.
A compression spring to extend the blade.
Lever locks on each section unlocked by movement of cable ring.
Not sure how I'd close it.
I have a idea for a seperate closing system. Not sure if I like it. Would work like this.
Stretch the springs/bungee of closing system and lock.
Load the blade....when ready open the blade.
When ready to close unlatch the closing system.
At this point closing system would need to be manually reloaded. The blade opens and closed but then needs a reload.
Opening spring would have to be very small and weak, just enough to kick blade forward.
Closing springs/elastic would have to be strong enough to close blade and compress opening springs.
Now there's another idea....the sissor jack, or jacobs ladder, at the back of the device.
There just might be a way to sissor jack that extention piece. I don't see it as very strong but it might work...but then you still have the blade to figure out.
If we just got rid of the extention it wouldn't be that hard. Sissor jack or slingshot the case forward on the wristband and shoot out the blade. Simple.
I might even be able to make that extend and retract...but that extra extention piece is just a major pain in the ass!
The more I think about this method the more a pain in the ass it seems to build.
Again, I see a double action wrist blade as being handle and blade. Basically taking a DAOTF and redesigning the handle so it can be strapped on a armband-redesign the button for cable control. That's it. I already have schematics for this and I'm starting to build it in Solidworks. I have a knifemaking buddy with a full CNC shop and he wants to build some OTF's with me this year. One of the first is going to be wrist worn. Sad thing is the more time I spend fuckin around on my forum and on the weapons builds it's time I'm not spending working on my other projects...my patent for the magnetic otf I have to finish in 2 weeks or ask for a extention, my gravity knife digital file for production needs to be done...now, the digital file for wrist blade/spike so my buddy can make a prototype.
After I get a bunch of info and people in here I'll take time off of the forum and just get things done that need to be done. I'm a master procastinator.
I have way too many things going at once and none of them are getting done. I have holes in the forum that need filling like the switchblade and schematic section.
I have made myself too busy
Little by little.
But my point with the new poll was this. Do you guys want a double action wrist blade or a Assassin's Creed replica?
You're not going to get both in one. I really don't think it's going to happen. Won't stop me from trying, but I know the limitations.
Very few of the Switchblade makers will even take this request seriously...I know...I know these guys. I can honestly say I know most of the top switchblade makers that are out there. Just hangout at 'the swithblade forum' or ' sharper deals forum' long enough and you'll meet the best of the best, and I've been on there for many years. One of the best is helping me with my Styletta gravity knife. I've seen him respond to this question on other forums, most of the switchblade makers out there do not take any of these arm mounted devices seriously. They won't build it for you or even try to design it.
If anything they will point you to me. Most will tell you to drop the idea. So I think you're stuck with me

I'll do my best.
Fact is that the double action wrist blade is going to happen some time this year, it's all a matter of me getting time do design and them my friend to make prototypes. And he's a KILLER knifemaker!! I'll give out his name when I feel it's ok to do so. He makes nice otf's!! So to be honest it will be months before we have anything in hand. But it is being designed. Think Microtech knife on wrist with cable rings.
It won't be extending like Assassin's Creed but it will be real. Once we make the first model, which I see being black and 'tactical' looking, then other designs can be built around the device....nice engraved versions and such. And it won't be small, were looking at about a 9-9 1/2 inch case with a 8 inch blade...roughly.
about this size

looking kinda like this

I'm trying to design it so it can be worn over or under, problem is cable length is different, placement too.
For above I'd like a index finger pull ring to open and ring at the inside of the wrist to pull close.
For below both rings would have to be on sme side.
I could do it the same and you would use index to open and ring finger to close on the above model. Probally what it's going to be.