How Do Double Action OTF Knives Work???
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- เผยแพร่เมื่อ 21 ส.ค. 2019
- Ever wondered how your double action OTF knife does its glorious, fidgety thang? Observe this anatomy lesson and you'll never wonder again. Shop OTF knives: bit.ly/2Nquf3I
- วิทยาศาสตร์และเทคโนโลยี
GOT IT! The thingy goes down and the doohicky goes up.
Hahaha, pretty much. - Holly
What do you use an OTF blade for? I am confused ...
@@raygun4468 for the same things that you would use a fixed blade or a folding blade knife, while it mayn ot be as strong as a fixed blade knife (the tang does not reach the full grip lenght), the blade retracts inside the handle making it smaller to carry, also it being automatic means that you can use it if you only have one hand free
@@quentintin1 Thank you for explaining what a full tang blade is ... I had no idea.
Now watch what I do know ;)
th-cam.com/video/54oh_CZmcU4/w-d-xo.html
Sounds like my highschool prom
I knew roughly how the slide worked but damn I didn’t realize it was THAT symmetrical going both ways. Good video
4:27 that would be potential energy, but yeah, great video!
cowcatcher er haha I was resisting the urge.
I came down here to say the same thing lol
Isn't it both?
Potential energy is build up, then released and converted into kinetic energy.
@@ericthered2963 yeah, but the stretching of the spring creates potential energy and the release of the spring is what creates kinetic energy
@@monolithichashies7477 Ah! I knew I've been paying attention in Physics class!
(One of the few interresting classes)
A plexiglass side would have been perfect!!! Then you could see it in action.
I was thinking the same - then slo-mo video the knife in action.
Yeah im just not seeing how the spring can unload that far with a slight movement and then reload with the same distance of movemnet. Something's missing in this video. Edit i see it now. I was thinking she was saying the spring went under the plate on first view .
an explanation from Blades and Boom: th-cam.com/video/emolEltWxPI/w-d-xo.html
Microtech made a g10 jade version that is somewhat see through, although you cant see very well still lol
Was thinking the same..."great minds...something something "
Thank you!!! My boyfriend just gave me a killer switchblade and a buddy of mine asked me if it has the safety feature of not deploying if it's butted right up against something. So being the curious girl that I am butted up against my workbench and blammo. It jammed it and disengaged the spring deployment. I watched several other videos and they were too long and slow and with zero information. You're perfect video explained it precisely and I was able to fix it before my boyfriend got upset with me lol. Girl Power!! Love you. Keep making cool vids. I love how you don't ramble on or tell me about your day and all the other nonsense people do. It is so appreciated.
Ah! it's a reversible captured slingshot! Now the magic makes sense. Thanks!
Thank you for your comment! I was still kind of not understanding what she was saying especially the parts where the blade like holds and then shoots back into the handle. But your comment made it all make sense!! Ty!
Well described. I've always wondered about this. "How is this even possible?" Such a simple mechanism! I never put thought into the actually trigger creating and maintaining the perpetual type energy so that this thing could keep working over and over again. Great vid. I learnt something today. Being in Canada I'll never be able to own one since they're prohibited by law (even owning one), but I've always wanted one for fun. :)
Lol moo
I'll mail you one
@@duenderodriguez9386 lmfao, you think it'd get past our customs security?
We got our rights to own in Virginia in July. What about people with one hand? Do they not deserve a tool they can use?
FYI you can get very decent quality made knockoff OTF "knife" in Canada that is a metal comb instead of a blade. Very satisfying fidget toy have a full size and tiny keychain sized version. They're very fun and also still disappointing that they are not real knives. I'm reasonably happy that the comb ones I got are actually better quality than the chinese knockoff Microtech that I had a chance to play with.
Fantastic explanation. I am a designer working on a mechanism identical to a DA OTC, and this is the best explanation I have seen of an automatic knife on you tube! Excellent work!
Ya how'd that work out for ya?😆
So why not just explain what 'DA OTC' means ?
I just watched another video before this one, done by a guy that was very professional and obviously knew his stuff. I didn't understand the process before watching his video, or after. So I watched yours. Now I get it. Thanks, you explained it perfectly. Keep up the good work. 👍
That is a really smart design, so simple yet so effective.
Great job explaining it👌🏼
You did an excellent job showing the inside of the knife and explaining how it works. Since I saw my first OTF in action as a child, I was fascinated and tried to “visualize” the mechanism and how it worked. Now 60 plus years later I have the answer. I did look up the date this mechanism was invented and was amazed to find out it was in the 1850’s. Just goes to show you that some inventions are perfect no matter when they are made.
It took me 2 tries watching and I finally got it. Thanks! When you did the demo and the end metal tab wasn't in view, I had to think through that a bit and then the light bulb went off. Thank you very much! Mystery solved! And amazingly simple. 👍👍
Glad it helped! - Holly
Wow thank you so much! I am just learning about spring assisted knives and 10 minutes ago OTF knives where total magic to me 😁
Glad to be of assistance! ;) - Holly
This has puzzled me for YEARS THANKS!
You mean had*
@@ayraali8822 perhaps he had not fully figured it out at the time of posting but could tell he was about to get it
Good video! Always appreciate someone willing to figure something out and sharing their findings.
You actually did clarify one very essential point for me that I did NOT previously grasp; that the springs are only under tension when the user is placing load on them (with the thumb slide), and briefly as that load is being discharged by deploying or retracting the blade. I had the incorrect impression that the blade was under push spring load until the user hit the big shiny illegal button, as well as the directionally obverse tension too.
The springs are under some (mild) tension when engaged in either neutral position, front or rear, but yes, they're not drawn/stressed until the thumb pushes the slide via the thumbstud. The "double action trigger pull" is a pretty good analogy: push, push, push, then Bang!
@@ronaldwells4427😮 BBY 0
An excellent demonstration on how the mechanisms work. Remember when you're tightening your screws go from one corner not all the way tight then what you get them all in there snug then tighten them down not too tight great video
Awesome video!
Very helpful description regarding how the mechanics (internal latches) work to hold the blade in the open locked position and closed position when not being fired in either direction.
Also as a side note... sorry to even point this out, but I can't help but feel the need to suggest that the bit in your driver is a TORX bit and not a HEX bit, which is in fact the same screw/bolt head driver platform as an Allen key.
The first video I watched was supposed to explain this but only explained how it unlocks those hinges. Now that I know how the springs work and how everything else works together, it makes a lot more sense. You did a lot better at explaining this than the guy in the first video I watched
Never let anyone say You don’t know knives.
Excellent and very thorough explanation of the OTR mechanics.
Great job.
I have one of your otf Keychain knives that stopped locking (not a quality issue, I'm constantly playing with it) and now I understand that the latch is probably just worn down a bit. Thank you!
You have an excellent taste in knives. Just made my first purchase from you guys and something tells me it won't be my last.
just got a lighting otf from your site for my birthday! i love it, super fun!
This is the 3rd video about front out knives I have watched, but your video is the best explanation I have seen on that topic!
Actually, not only did you explain the internals on the DAOTF well, but it is one of the best I've seen.
Exceptional, informative commentary. Very articulate as well!
This mechanism is nice and clever designed. Thank you for showing it! ;-)
Its awesome seeing exactly how it works. I love the otf i bought from y'all but i dont carry it at all because i carry a small to medium fixed blade since i live and work on a farm lol
I just recently started carrying a $40 chinesium otf dagger style knife, I have to say, having a one handed pocket knife is the greatest thing ever.
With one hand I can quickly deploy and retract the blade without any weird hand motions, it's literally a flick of a switch.
This is my first otf so I didn't wanna spend a ton of money and hate it, so I went with a cheap proof of concept essentially. I will say after about a month of carrying, I will be buying my first ever $200+ knife as soon as I can afford it, because otf are great every day useful knives, especially when one hand is tied up and you need a blade and then need to be able to safely put it away.
@@Criam Agreed, for farmers this is pretty good style knife (only downside is the dirty muddy conditions farmers work in), and for everyone else these are like the best utility knives ever! Unlike most knives, I've yet to stab myself with an OTF switch, incredibly safe! Also the one handed opening while awkwardly working under a car? Fantastic! Switches are the best thing since sliced bread, because they can both slice the bread for you, and cut those pesky zip ties which bread just can't cut!
This has helped me understand the mechanical features that I’ve wondered about for so long, thank you!!
Awesome demo! Thank you for taking time to make it
Fun. Good info.
Brevity is awesome. While its great to be told what we're about to be told, we dislike forwarding through it.
Demonstration, then practical application is good enough. Will have to watch again to master your narrative and finger bits. Nice to have someone on YT doing this explanation.
That actually was a real good explanation. I had no idea but I understand completely. I never understood guys when they say the spring is never under tension. To me it didn't make sense. Well it does now, thanks!
Loved the explanation... Always wondered how kinetic energy worked in this... Thank You Thank You Thank You
THanks for the explanation.
I finally know how they work.
It's much simpler than I expected.
I was thinking it was some dark elf magic.
Some very clever engineering to make one set of strings work both to deploy and to retract the blade with just a little help from a thumb muscles. It feels almost illegal when you snap it back and forth and see it fly like that like it has perpetual engine inside to provide it with energy. But now, when I realise that it takes all energy it needs from the little thumb movement you do to move the slider, I'm even more impressed. Very, exceptionally witty engineering
Thanks for the video and I'm glad you understand how it works now. But I'm still in the dark on this thing, but it is late and i'm really tired.
Why hasn't someone done a cutaway animation of this?🤔
Best explanation I've found, thanks.
Really helped me understand.
Great explanation, showing the plate moving under the springs, extending them to provide the energy to fling the blade was the key bit for me that other videos failed to make clear.
Thanks! I had the same issue, so I'm glad I was able to illustrate that accurately. - Holly
I was just about to google search this very question when I saw this in my feed. Thanks I've subbed.
Nice video! Great job breaking down the functionality! Thank you!
Awesome video. I always wondered how these worked but was afraid to take one apart. Great job.
Thanks! Your knives can now rest easy. ;) - Holly
Next time you buy a Microtech or Benchmade just take it apart and send all the pieces back to the manufacturer. They'll put it back together and lube it up. Lifetime warranty on those OTF knives👍
@@johnherne8489 um more like automatically void the warranty if you even try to sharpen a microtech. They want them sent back to them
Great video! When the spring rear tang pops off the back of the blade u-notch when blade tip hits something while ejecting, additional procedure is needed.
1st push blade to the back behind the rear gate stop.
2nd hold rear spring tang in blade u-channel down with thumb while using other thumb to slide side button into position with pretention.
3rd rotate top cover over rear tang with downward pressure until in place. other wise "pop goes the weasel" try again.
BLADEWORX Lightening ELITE needed this finesse procedure to reassemble.
Great explanation. I watched like 5 other videos and none of them made much sense. Thanks!
Thank you for this. I was able to fix my son's knife using a pen spring I cut down for the bottom latch spring that broke. Have no clue where to actually buy a replacement but the pen spring seems to work fine.
That was a great explanation. Thank you
good explanation. neat simple mechanism
That was a great description!
Thanks!
I think this is called a bystable mechanism. Another place where these mechanisms find an application is in electrical switches. You first move the lever until the trigger point is reached, at which the contactors separate quickly to prevent arcing during the disconnect.
Cool design, good explanation.
Thanks for this video, my knife stop working about a year ago and I didn't want to open it up fearing springs and parts would go flying everywhere. You video gave me confidence to try it and I found that the problem was that some cockroaches fhad got inside it via the blade slot (little bastards) and jammed the blade. Mine is very similar except it has only 1 spring not 2 like yours.
I cleaned it up and sprayed plenty of silicon lube and now it works a treat.
Thanks again.
cockroaches????
Very nice unique video , the best I’ve seen on here 5/5 👍
Thanks. I've been thinking about taking mine apart but due to your video I don't have to now.
That's a very good one. I once bought a cheap front opener just to collect. I had no use for it though because it's illegal in my area and my Spiderco Clipit knives were far sturdier, faster and legal. I shortened and reshaped the 4" blade of my "Police Model" to a legal length of about 3 or 3 1/2 inches and reshaped it with a belly instead of the original straight edge. I also reshaped the stainless steel handle into a pseudo "coffin handle" just for looks and to make it more compact.
Super helpful, had to take mine apart to clean blood and guts out of the action, bit of liquid wrench and bam good as new
My otf knife didn't work fresh out the box.. cracked it open and had no idea what I was looking at. This explanation was very helpful, thanks!
They are cool, but like switchblades have a major design flaw: their natural inclination is to open, and the only thing preventing that from occurring is a mechanical catch. The button to release the catch can easily be moved by accident; then you have an open knife in your pocket. And of course, the “worked in stiletto” that you flick open with your wrist is also a hazard. By far the best design of a “blade contained within handle” knife for one-hand open is the spring assist. It’s natural inclination is to remain closed - yet it opens as easily with one hand as any automatic knife.
There are other designs that reduce the risks you're speaking of.. Ones with side plate mounted thumb controls with a slide that can lock the operation from being engaged to open accidentally. I am not a fan of this style of knife in general but it is intriguing how it operates none the less. I favor one hand operation so i tend to carry either medium fixed blades (sub 5 inch full tang thick backs) or assisted folders.
Excellent technical communication!
And yes, very important topic :-)
Wow such a smart design. This is awesome haha I always wondered how these kind of knives worked
Nice video, you did a good job explaining. ❗✔👍
Awesome video Holly may I suggest doing more informational videos also your doing a great job I look forward to your videos every time
Thanks, Freddie! I'm hoping to do a lot more like this one in the future. :) - Holly
Great explanation. Truly. Wonder how long the springs hold their tension?
Great presentation. Entertaining and concise.
Such a cool design
I always wondered why they don't use this kind of technology for other things. One idea came to mind about a semi automatic NERF gun that would use a similar mechanism. I don't fully know the logistics but I feel like it has an insane amount of potential for other things besides OTF knives.
Well guns have a similar spring system used in them to prime ammunition into firing, so yeah, it is widely applied.
@@markospaic1740 Semi auto guns use gas or human power to send the bolt back and mechanical spring energy to move forward only. This device is fully mechanical using inertia to lock up in both directions under the same set of springs both ways. So it isn't the same. The only similarity is the use of a spring which is a long ways from being similar since springs are found in a lot of devices. Also the choice of words "to prime ammunition" may not have been the best choice. Not picking on you for it as it is possible you speak more than one language and English isn't the primary so thanks for your efforts either way.
The main limiting factor is it takes all energy it needs to work, from you moving the slider or whatever. The more energy your mechanism needs - the more strength you'll need to operate that mechanism. It kinda works best with the knife because the blade is pretty light, and you don't need to move it much. When the thing you move is heavier, or when you need to launch it really far, is when problems begin
Excellent presentation 👍
AWESOME video!
I'm from England clear explanation love your accent ,
Thanks for posting this. I thought I broke my new knife trying to clean it. Great video.
Very good explanation!
I bought that knife and loved it so much I had to get another😀
Awesome. Now I don’t have to take mine apart. 😂 Mine is green with black blade, inlay, and clip. This is my most favorite knife ever.
learn something new every day. Thanks.
Such a simple but interesting design.
Excellent job
Interesting. I always assumed there was a little magic fairy in the butt end of the handle kicking the blade out and pulling it back in. A few years later and you can still educate me on how the physics of this work, pretty cool
Thank you for teaching us how it works
This is a great video! I am designing a sword and I think I’ll use the same mechanism to get it to extend.
Perfect description, nice job.
Thanks! - Holly
Very nice. Great breakdown.🍺
Hey I always like to see women explaining things. You did a great job, the only thing is get a better close up for us old guys as we can't see as good as we used to. Great job keep it up.
Great video.
great video!
Thank you Holly that was useful
Just a quick follow up: I have puzzled over knives like this for years. They are illegal in Washington State and when ever I was in a state where they are legal I never thought to buy one and tear it apart. Thank you. Subscribing. Looking forward to learning a lot.
oddjobbobb you can order them online
@@jamesmcroberts2257
But you can’t get them sent to a state where it’s ILLEGAL …
Have you tried?
I always thought they were illegal here in Nevada, but come to find out, they’re not
They actually sell them in some stores ( not many)
I bought one at a gun show.
All I’m sayin though is it can’t hurt to try
Well - for example …
Back in 1987 , off duty Florida State Troopers were working a gun show …
They sold me a “ out - the - front “
stiletto knife .
They explained , it’s not illegal to
“ own “ , as long as it stays INSIDE my house ! Use it as a letter opener ..,
If I walk outside my property - I’d be subject to arrest .
So yes - every state has its own crazy laws .
Wow, thanks for this!
Great explanation. TY
Perfect explanation
Thx for that!!! I finally got my knife back
You did a fantastic job explaining and showing the knife !!! Impressive!! Where can I buy a knife like yours??? Thank you!!
FYI it's POTENTIAL energy as you pull the spring and transforms into KINETIC energy when the blade is released and goes into motion... OTHER THAN that... GREAT breakdown amd explanation... conveyed VERY WELL!
Good video
Learned something
So the thumb slide disengages the notch that holds the blade in place as it builds tension on the string
Thank you! I was able to fix my knife after watching your video. Turns out Kershaw 9000 uses a almost idential mechanism!
Awesome, I liked the video.
Yay got it! Knife is fixed! You would make a great trainer or instructor. If you’re not teaching paid more. I’m surprised this video was done by a girl; not what I expected, but I learn something new every day. Great job, Girl!
I always thought these knives where ingenious.
The neat thing about them is unlike some believe you can not place it against a target deploy the blade and have it puncture the object.
When you release the blade the spring mechanism will disengage leaving the blade slack and without resistance.
So if you deploy the blade and it strikes anything before it is fully released and locked in position it will simply bounce off as a safety function to prevent accidental self injury.
Also we use to call these types of blades “Eagle Knifes” and a automatic knife in which you used a press button to activate was called a switch blade.
I hope my question doesn’t come in too late for a reply. So if I understand what you’re saying, the blade is moved in either direction because of the 1/2-3/4 inch movement of the “thumb-slide?” In other words, the movement of the thumb side is what stretches the springs enough so that when the locking-tab is disengaged the blade moves the the other locking-tab? And at all times except when the springs are stretched by moving the thumb-slide, the springs are “at rest?”
Really Good video. Lots of Great information, well Explained. 👍👍 ⭐️⭐️⭐️⭐️⭐️ 🥇
Now we know. Great video.. thanks