Strongest folding knife !

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Laurence,
I think that the FFK should be a 9" knife when open, so that makes the blade around 4". From a design standpoint Elmax for the blade would give extra strength at tang lock area. The 420V handle tang cavity area is still reinforced by the right bolster so it's over built to begin with. Elmax is about 30% stronger than 440C. The FFK blade steel and handle steel lined up(like a full tang knife) when locked open (like a full tang knife).
 
South Fla is an extreme tropical environment, and our lifestyle involves offshore fishing, diving, mountain biking. It rains often. Ballistic nylon sheaths seam to work better. Dunk the knife or multitool with the sheath in fresh water, wipe and air dry. That said, I do have a Buck and leather sheath
 
Surfingringo said:
Holy smoke, you guys are brutal!! Lol. Give the guy a break. He took the time effort and had the ingenuity to come up with a new lock design. I'm glad folks are thinking of new ways to push the boundaries of folding knife design...aren't y'all? You don't have to like every design to appreciate that folks are trying. I think the hate spewing is a bit over the top. I dunno.

Having said that, you should know, op, that you need to pay a modest fee to upgrade your status if you want to promote your products on here. I can only guess that that's where a lot of the negativity toward you is coming from.

Regarding your design, I wasn't able to completely understand how the lock works from the video. I would suggest making a video maybe with a progression of photos of diagrams that would better illustrate exactly what's going on.

Anyway, it's not my cup of tea as I'm not into the overbuilt folders at all but I can appreciate your effort and ingenuity that went into your prototype. Keep at it and good luck.

Now pay up like everyone else if you want to keep talking about it! :)

Take care,

Lance
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This is why you are one of my favorite posters. Always classy!!! :thumbup:
 
FFK said:
South Fla is an extreme tropical environment, and our lifestyle involves offshore fishing, diving, mountain biking. It rains often. Ballistic nylon sheaths seam to work better. Dunk the knife or multitool with the sheath in fresh water, wipe and air dry. That said, I do have a Buck and leather sheath
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I hear you. Most of the knives I buy that are cheaper come only in Nylon, and that's fine with me, doesn't bother me. I carry them that way... I think it just sounded a little like you knew a great secret that ballistic nylon was the best ever, so we were eager to hear, that's all. ;) Cheers.
 
There are different environments. Some wet, muddy, dry, cold, hot, dusty, sandy. That said..... Stainless steel, FRN and ballistic nylon are a good start.
 
So where is the video of you banging a big hammer on your knife in every which way? Prying open brick walls and car doors? Splitting other blades with your blade? Send me your prototype and let me destroy it please. i'll post the video.

Every fixed in the same material thickness and grind type will theoretically be better because the load is spread in one material piece. As soon as you make it a folder aka 2 part design you will have stress risers at certain flex points. You see, real material has variations in it, its never like the simulation. Its 90%, but its not the simulation. You can never make a 2 part design as strong as a one part design.

you can make it strong enough for a certain job, or stronger than any other design, but 1v1, one piece in the same dimensions will always be stronger.

Stainless steel will never be sharper than carbon steel. Everything is a tradeoff. ;)
 
ev13wt ,
I agree with you. You have valid points. First, actual prototypes cost a lot so Solidworks and Autodesk inventor has help quite a bit. A full tang blade is the best choice "agreed". Based on an extensive amount $ of FEA(simulation) work we did, the FFK can do what current folders cannot.
 
ev13wt said:
Stainless steel will never be sharper than carbon steel.
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Um what? Please explain to me why the higher chromium content in stainless steel prevents it from taking a finer edge than those classified as carbon steel.
 
FFk, you bring that knife in at $99, you'll sell more than a few, I'd wager. I'm a big guy, what's "overbuilt" for most feels "just right" to me. Some griped about your membership level, you bought a better one. Questions have been asked,a bit of mud slung..you could have exploded, we've seen plenty that have, you didn't. They asked for pics, you got pics posted, and even a basic schematic. I understand that without a patent, that was taking a big risk, and I commend you for it. Make sure you post when they're available, and where to order one. For a measely $100 it'd be a nice addition as something new, if nothing else. Oh, you'll have to upgrade your membership a bit, but it's worth it to sell to these guys.
 
FFK said:
The FFK blade steel and handle steel lined up(like a full tang knife) when locked open (like a full tang knife).
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No. Not at all like a full tang blade. Its a folder. Its not a fixed blade. Deal with it.
 
FFK said:
Large folders are best carried in ballistic nylon sheath....either clip on waist or belt type. As far as materials for knife all simulations have been done with 440C. It's easy to find and has good tensile/compression and shear strength. Surprisingly the FFK is not that heavy. Elmax is my personal favorite but it is expensive.
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As noted previously, many knives attempting to do what you are doing have failed, and one reason is they have not produced something with the practicality needed for a product of this type to see adoption and usage. Not all consumers want a ballistic nylon sheath. If you are intending to build a knife that you will sell to customers, and you are building it on the concept of being more flexible than a traditional fixed or folding knife, you may want to think about making the knife having more carry flexibilities to justify the concept. If the primary (or only) carry method of a folder is a belt sheath, I'll just buy a fixed blade for 1/5th the price or less in a steel like 1095C.

While 440C is a great steel, ELMAX is going to be more enticing to many customers, and it's a better selling point. In an image and marketing sense, 440 has somewhat been bastardized by too many Chinese makers branding knives with the "440 Steel" markings. And while I like 440C, something like good CPM-154 makes a pretty big improvement all-around, and it's a steel I much prefer to use and will pay more for knives with premium steels as such.
 
ev13wt said:
So where is the video of you banging a big hammer on your knife in every which way? Prying open brick walls and car doors? Splitting other blades with your blade? Send me your prototype and let me destroy it please. i'll post the video.

Every fixed in the same material thickness and grind type will theoretically be better because the load is spread in one material piece. As soon as you make it a folder aka 2 part design you will have stress risers at certain flex points. You see, real material has variations in it, its never like the simulation. Its 90%, but its not the simulation. You can never make a 2 part design as strong as a one part design.

you can make it strong enough for a certain job, or stronger than any other design, but 1v1, one piece in the same dimensions will always be stronger.

Stainless steel will never be sharper than carbon steel. Everything is a tradeoff. ;)
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You were doing great until that last line.
Not only can you make a stainless steel just as sharp as a equivalent content carbon steel, The stainless edge will outlast the carbon steel.
 
I agree with poster 172, that while 440C is a fine steel, you will have more sales if you use CPM-154 because of the china Syndrome.
 
ev13wt said:
I read about stainless not getting as sharp as carbon on various sites. Supposedly the grain is finer?
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That isn't just wrong, it's borderline absurd. Who ever said that must only make/sell carbon steel blades.
 
Joe Duder said:
That isn't just wrong, it's borderline absurd. Who ever said that must only make/sell carbon steel blades.
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The edge on stainless steels lasts much longer than said edge on a comparable carbon steel. There is some much BS and misleading info on the net and about knives still around it sad.

I suggest you get both a quality made carbon steel and Stainless steel culinary knife and do some testing for yourself.
i'm sure you will find that your quoted source doesn't know beans about steel, knives or sharpening.
 
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