Survival knife ?

Milling can impart heat when the milling bit loses its sharpness or it runs at speeds which are not optimal or the lubricant is insufficient whereby either cause heat buildup during the "cutting" process.
 
"lubricant" meaning coolant in any a way; insufficient type or volume rate at which it's applied.
 
Nathan the Machinist said:
We've been kinda holding off on sneak peaks as we try to dial in the details, but these are the three machined prototypes where we're evaluating different edge thickness on functional models in Delta 3V.

1_6.jpg~original


11.8" total length, 6.5" blade.

We're still dialing in the handle, choil geometry and some small details but we hope to be close enough to go ahead and order a custom run of 3V in a special gauge for this project.
Click to expand...

Hi Nathan,

If I may ask, the survival knife pictured here. Is that the final process before the stonewash step ? Guess I'm asking what does the 3v look like before stonewash ? I like the way it looks in the pic with the machining marks
Great blade !!!!
Thanks

PS I'm really liking the surface texture look that's on the flats by fuller and ricaso :)
 
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Coke said:
The most important factor that influences the creation of the HAZ is thermal diffusivity. Technically speaking, this coefficient depends on thermal conductivity, density, and specific heat of a substance. Materials that show a high thermal diffusivity are able to quickly transfer variations in heat, rather than heat itself.

In other words, if a material demonstrates high thermal diffusivity, it cools faster, and HAZ is reduced. Conversely, lower coefficients mean that the energy cannot be drained quickly, and the HAZ will be wider. For instance, 304A-grade stainless steel has a thermal diffusivity of 4.2 mm²/s, much lower than structural steel (11.72 mm²/s).

From the production process standpoint, the extension of the HAZ depends on three factors: quantity of heat applied, duration of exposure, and area affected . If large amounts of energy are provided for a long time and with wider beams, the HAZ is larger.

This explains the reason that, regardless of the material being cut, any cutting technique causes a different effect:

- Shearing and waterjet cutting do not provoke a HAZ because they do not overheat the sheet metal.
- Laser cutting generates the smallest HAZ among all thermal cutting techniques because it applies heat on a very small area.
- Plasma cutting generates an intermediate HAZ because the plasma pulse is wider than a laser beam. Higher currents allow for a higher cutting speed, reducing the duration of exposure and the width of the HAZ.
- Oxyacetylene cutting generates the widest HAZ of all thermal cutting systems because of the intense heat, slow speed, and wide flames.

Heating caused by the welding or cutting process and subsequent fast cooling result in both chemical and metallurgical alterations. Oxidation is the most noticeable and immediate change, and it is also responsible for the brightly colored bands. A light surface nitriding also can occur, resulting in an increased hardness and decreased weldability of the metal.

Another common effect is corrosion, derived from stainless steel’s sensitive nature. Intense heat causes the precipitation of chromium carbides around the grain boundaries. In these areas, chromium content drops below 10.5 percent, and steel loses its ability to form a passive film and relinquishes its ability to be stainless. The result is the so-called intergranular corrosion. In extreme cases, metal will turn black.

High temperature also can provoke hydrogen embrittlement. Gas diffuses through the metal and creates a strong pressure within the lattice, reducing its tensile strength and toughness. If the hydrogen gas is not removed, it can cause spontaneous cracking even 24 hours after heating.

From a metallurgical point of view, heat generates localized hardening. In some circumstances, austenitic stainless steel can turn into martensitic, increasing its hardness as well as its brittleness. In other cases, heated metal can become weaker.
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I feel like you're trying to imply there is a HAZ problem there? There is no thermal cutting process used, they're milled.

I have been spending time to answer what I thought were genuine questions, but they're not are they? You're just trying to stir up controversy.

This post of yours aren't even your words, they were taken word for word from this site: http://www.thefabricator.com/articl...you-need-to-know-about-the-heat-affected-zone. Verbatim. Using someone else's words and attempting to pass them off as your own is plagiarism.

You're not trying to engage in honest dialog, you're simply yanking my chain and attempting to be disruptive. Go away troll.
 
duramax said:
Hi Nathan,

If I may ask, the survival knife pictured here. Is that the final process before the stonewash step ? Guess I'm asking what does the 3v look like before stonewash ? I like the way it looks in the pic with the machining marks
Great blade !!!!
Thanks

PS I'm really liking the surface texture look that's on the flats by fuller and ricaso :)
Click to expand...

No, that's not the final step before stone wash. The final step is a clean 320 grit grind with most tool marks removed. Those prototypes are 120 grit with mill scale on the flats, they wouldn't really be ready for tumble yet.
 
Great looking model and rest assured I'd like to be in the mix my friend..... :)

Nice job of research and quelling...onward and upward! :D
 
Nathan the Machinist said:
No, that's not the final step before stone wash. The final step is a clean 320 grit grind with most tool marks removed. Those prototypes are 120 grit with mill scale on the flats, they wouldn't really be ready for tumble yet.
Click to expand...

Thank you for that info. Would there ever possibly be a chance for a user finish ? like a rough finish for lack of better words. Even your stonewashed blades have a finish so nice you almost don't want to use them,,, almost :D
The finish on my LC just about glows !!!!
 
These are looking great, Nathan. I'm new here, but reading through your threads really like your knives and the thought and time you put into their designs. Plus your communication is A++. Looking forward to being a customer.
 
Nathan the Machinist said:
I feel like you're trying to imply there is a HAZ problem there? There is no thermal cutting process used, they're milled.

I have been spending time to answer what I thought were genuine questions, but they're not are they? You're just trying to stir up controversy.

This post of yours aren't even your words, they were taken word for word from this site: http://www.thefabricator.com/articl...you-need-to-know-about-the-heat-affected-zone. Verbatim. Using someone else's words and attempting to pass them off as your own is plagiarism.

You're not trying to engage in honest dialog, you're simply yanking my chain and attempting to be disruptive. Go away troll.
Click to expand...

You have it wrong Nathan.

Goodbye, and have a good day. :)
 
Nathan the Machinist said:
We've been kinda holding off on sneak peaks as we try to dial in the details, but these are the three machined prototypes where we're evaluating different edge thickness on functional models in Delta 3V.

1_6.jpg~original


11.8" total length, 6.5" blade.

We're still dialing in the handle, choil geometry and some small details but we hope to be close enough to go ahead and order a custom run of 3V in a special gauge for this project.
Click to expand...

Love this. The tall blade height, the high saber grind, the fuller, and the handle. All look great. Really looking forward to this one. The DEMAND is going to be strong with this one.
 
duramax said:
Thank you for that info. Would there ever possibly be a chance for a user finish ? like a rough finish for lack of better words. Even your stonewashed blades have a finish so nice you almost don't want to use them,,, almost :D
The finish on my LC just about glows !!!!
Click to expand...

You can send me yours and I'll put a custom user finish on it. ;)
 
Did Nathan use his prototype HC to bring down to proverbial hammer to shut down this technical mambo-jumbo jargon? Nah! I think that he used one of his prototype "survival knives" instead. Man, I love that new and soon to be named pattern even more now :D
 
xxwarderxx said:
You can send me yours and I'll put a custom user finish on it. ;)
Click to expand...

Lol :) very generous of you, do I have to cover shipping both ways lol

I guess if I have to mark up that finish I will lol
 
Casinostocks said:
Did Nathan use his prototype HC to bring down to proverbial hammer to shut down this technical mambo-jumbo jargon? Nah! I think that he used one of his prototype "survival knives" instead. Man, I love that new and soon to be named pattern even more now :D
Click to expand...

Can we open up the "name the knife" thread again...

I hear-by nominate "The CPK Mambo-Jambo Knife"

All in favor, say 'aye'
 
The proof is in the pudding
Even if there is oxidation or HAZ it does not appear to affect the final product
He can pound on his knives with a hammer and chop bricks and nails with minimal dammage to the knife
Good enough for me
 
Hey you all, Tim here, just an old hillbilly from WV. Did anybody suggest, The Nathanator? The Jo-Vival?

Ps. Nathan, loved the way you dealt with the troll. You brother, have class and style.
 
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