CPM-3V 4" Tactical Fighter from Thailand !!

Qfp..

Coke said:
The mere fact that you've now stated that the fuller is so "insignificant" clearly implies that it does have SIGNIFICANCE. You've just proven yourself to be of DOUBLE STANDARD.

Check out Youtube and see how fullers make a blade crumble when struck hard with another metallic object. Youtube has lots of such videos. A strong chopper, sword, crowbar and the like can easily strike a knife VERY HARD on its back/spine.

I rest my case.
Click to expand...
 
You said you wouldn't respond anymore, yet you did... double standards shiny... double standard. Just like the thing in your avatar.

Now I'll say it, but unlike others, my word is my bond. I'm done posting in this thread about simple facts of engineering that others cannot comprehend.

As I said shqxk, I like your knives, they're well made, with or without slotted grooves come fullers in them. I wish my custom knives were made that well.
 
Last edited:
Coke said:
You said you wouldn't respond anymore, yet you did... double standards shiny... double standard. Just like the thing in your avatar.

Now I'll say it, but unlike others, my word is my bond. I'm done posting in this thread about simple facts of engineering that others cannot comprehend.

As I said shqxk, I like your knives, they're well made, with or without slotted grooves come fullers in them. I wish my custom knives were made that well.
Click to expand...

He didn't respond. He quoted you for posterity. Big difference.

Some of the toughest knives ever made have fullers. TGLB and the CPK Light Chopper come to mind immediately. Take your own advice and go watch some youtube videos of those being abused. Not a single one of them shattered because of a fuller.

On topic, those knives look great. I could do with out the recurve bit but the lines are very clean and well done.
 
everyone having a good time? Must be quite the party, with all the infractions and such :)

Pro tip; knife related discussions can occur WITHOUT insulting other people and trolling them! Let's give that a try, shall we? Usually works well around here that way
 
Calm down guys! I appreciate any comment and Thanks for interested :D

The fuller are there for retain rigidity of the blade while reducing overall weight/volume of the knife!

For instance, another knife with the same spine thickness but full flat grind (without fuller) will be very close at overall weight to this knife but will be much thinner cross section at around the edge thus much weaker in that area. The rigidity of the blade will be significantly weaker too since I-beam construction has much better strength to weight ratio to a simple geometry one.

But if the blade has the exactly same saber grind but without fuller the knife sure will be slightly stronger due to more steel but it will be noticeably heavier too!

So in conclusion, the fuller in the knife or sword is for tuned up the balance/fastness.

Sorry for my not very good English anyway :p
 
Last edited:
shqxk said:
Calm down guys! I appreciate any comment and Thanks for interested :D

The fuller are there for retain rigidity of the blade while having the similar overall weight/volume of the steel!

For instance, the knife with the same spine thickness but full flat grind will has much thinner cross section at around the edge thus much weaker in that area. But if the has the exactly same saber but grind without fuller the knife sure will be slightly stronger but it will be noticeably heavier too!

So in conclusion, the fuller in the knife or sword is for tuned up the balance/fastness.
Click to expand...

And they look good too! Nothing wrong with making a knife look good!
 
I sent you a vm.:D
shqxk said:
Calm down guys! I appreciate any comment and Thanks for interested :D

The fuller are there for retain rigidity of the blade while having the similar overall weight/volume of the steel!

For instance, the knife with the same spine thickness but full flat grind will has much thinner cross section at around the edge thus much weaker in that area. But if the has the exactly same saber but grind without fuller the knife sure will be slightly stronger but it will be noticeably heavier too!

So in conclusion, the fuller in the knife or sword is for tuned up the balance/fastness.
Click to expand...
 
shinyedges said:
I sent you a vm.:D
Click to expand...

For some reason I cant response your PM so I will anwser here! Thanks you shinyedges for the compliment but sorry that I don't have any intention to sell these 2 blades.

There are 2 makers who involved on designing this blade and one of them has gone forever... so this is pretty much remembrance of him.
 
Understood, beautiful knives my friend.
shqxk said:
For some reason I cant response your PM so I will anwser here! Thanks you shinyedges for the compliment but sorry that I don't have any intention to sell these 2 blades.

There are 2 makers who involved on designing this blade and one of them has gone forever... so this is pretty much remembrance of him.
Click to expand...
 
Good looking harpoons.

Big fan of the downwards sloping sabre-handle with a hint of coffin.

Also quite like the sharpening notch and the guard.

Very nice fullers.


Coke said:
No bloodline either... stronger spine, fighters need them.
Click to expand...
Bloodline? Assume you mean fullers.

Blodlines are in families. Fullers in knives.

'Blood grooves'...., well, they are neither here nor there.



Coke said:
The mere notion that reducing the thickness of any steel does NOT weaken it in that area is simply NONSENSE. Essentially it boils done to arithmetic.
Click to expand...
Suggest you brush up on I-beams.
 
Lorien said:
wasn't suggesting that the profile of the handle should be changed, just that a little contouring or milling might bring it up to the same level as the blade, if that makes sense
Click to expand...
I like the handles just as they are, but yes, a bit more contouring a la Bensingers sabre handles with a hint of coffin handle to the profile would look great.
 
Super nice blades on those knives, shqxk!

Coke - smiths have been engineering huge swords with multiple deep fullers for more than 1000 years and off into the mists of history, I'm pretty sure a knife can handle a tasteful, beautiful fuller like these have and still be plenty strong. Stress risers are what you need to avoid (no pun intended :D).
 
I normally dont like fixed blades. But those two are making me question that. Beautiful work. And i love the fullers. Especially how the grind lines follow them. Awesome.
 
Coke said:
Shiny,

You should read more about fullers, or as they're called in other fields of engineering, machined grooves, in text that is written specifically on that subject... and by all means post as much as you want.

The mere notion that reducing the thickness of any steel does NOT weaken it in that area is simply NONSENSE. Essentially it boils done to arithmetic.
Click to expand...


It does boil down to math, though I'm not sure that math is simple "arithmetic"

You might not be thinking about this completely right. It's helpful to think about a fuller as optimizing or improving the strength of a design by redistributing material to increase the area moment of inertia. Take a design of a particular thickness and weight using a particular amount of material. If you squish that design and push the material away from the neutral plane you increase the sectional modulus making it both stiffer and stronger.

No, cutting a groove into a piece of material does not make that material stronger. But increasing the thickness of that design and strategically removing material from unstressed locations allows you to use the same amount of material and achieve the same weight and balance characteristics in a stronger design. This is why fullers have been used historically on weapons and drive axles on cars are hollow and buildings are built with I beams rather than solid bars. A fuller cut into a knife doesn't make that knife stronger. But a knife designed with a fuller is stronger than an otherwise identical knife of the same weight (containing the same amount of material) that is thinner by the amount that would have been contained within the fuller. It's about doing more work with less material and is very appropriate on a fighter and has been used with great effect on swords throughout history and other large cutting tools where strength is an important concern.


edit to add: I've probably tested and broken more knives with fullers to destruction than most people. I can't say I've ever seen a blade fail because of a fuller, it's usually a crack that propagates from the edge and occasionally in a weak spot during a bend (behind the point or at the plunge) or from the spine during a blow, but to my eye the fullers have never contributed to a failure that I have seen. They're simply a means of redistributing material, like a dropped edge, and do not in-of-themselves cause weakness unless done really badly. They're a cool design element and are certainly at home on a well engineered piece. Comparing a knife to a boiler (a pressure vessel which does not have strength to weight or balance considerations but must merely not explode) is not a reasonable comparison in my opinion. Very different kinds of failure modes and performance requirements.
 
Last edited:
Thanks Nathan,

I was wondering if you were going to stop in and drop some knowledge on this.
 
You must log in or register to reply here.
Back
Top