Spiral spring - Hidden blade

[FlyingDachshund]

Wes,

That was my thought as well, and the clockwork askpect of it gives it a cool steampunk vibe. I'd been looking for a way to do this but Idle's clock-spring approach hadn't occured to me, so I'm glad he posted about it!

Mark in Okinawa

 

[mbwelder]

I would be worried about the legality of a spring loaded wrist blade myself!

 

[Idle Time]

Flying,

I thought about what you were trying to explain for 10 minutes but I finally got it hahah. I was stuck on there being only one rack and the cam being the gear. now I see that the cam has a piston that is actually a rack, turning a small pinion that has a larger pinion on top of it pushing the rack that has the blade attached to it. And you're right that would definitely work!

Now I need to hit up the flea-market and dollar stores for parts.

Oh, since your interested in the steampunk aspect of it. you could probably make this so the spring is on the outside part of the device, not against your forearm, with a plexiglass window to see the spring operating. definitely would give it some flair.

and I dont know if this will help you or anyone else but I found this on deviantart by a man named Kudrik.
Hidden Blade by ~Kudrik on deviantART

It is a housing for the hidden blade and he includes a tutorial for how he made it here
hidden blade blueprint by ~Kudrik on deviantART
and here
hidden blade blueprint part 2 by ~Kudrik on deviantART

I don't know if you know how to work with metal but I'm not that great. So I thought this was good help for starting out.

 

[Idle Time]

I would be worried about the legality of a spring loaded wrist blade myself!

Well any spring loaded knife isn't allowed where I live, only spring assisted. As well as any personal carried knife over 4 inches I believe. So this with an actual blade would be illegal, but I plan on just having a prop knife for safety.

But if you plan on making and using this as a weapon I think legality would be the least of your worries. :lol

 

[Ruskin]

You can find the video for Kudrik's blade here -
YouTube - Hidden blade

 

[Idle Time]

Good find there Ruskin. I hope everything works our with your design.

I think I'm good on my design finally, but I feel bad that it isn't really my design anymore. So I'll be sure to give credit to you all, Thanks a lot.

 

[Ruskin]

Hope it all works out!

 

[Weapioneer]

i want to make a scissor mechanism, but i am having hell. I have some thin metal strip i can use for it, but i don't have 1-2mm nuts and bolts for the pivots. Where can i get them? or is there a better form of pivot for such small sizes?