The "Ask Nathan a Question" Thread

twistedLogic said:
One year anniversary of the K20 kickoff!

Any preliminary results on the heat treatment?
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Running into some issues fixturing this sword in heat treat.

Our heat treat is a little bit different than others and this usually doesn't represent a problem but right now it is being a real pain.

We made some parts here last week and Peters is going to try them in their oven next week.

It's a process. It is not our first rodeo. We'll get it.
 
Tools_and_Tights said:
If a person were to use a powered worksharp belt sharpener, and the friction caused the blade to get hot enough to mess up the tempering, does the toughness drastically drop to that of regular CPM 3v or even less than that meaning even lower toughness than regular CPM 3v)
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I’ve been using it on cpk delta 3v long before that info came out. Granted, I was using lowest speed and not aggressive belts and I never keep it on there for more than 1 second per inch. With that technique it’s definitely not heating the edge and certainty not enough to screw up heat treatment.

I have ZERO concern my CPKs are less tough because of it. Low grit and high speed might be a different story but I imagine technique plays a larger role than anything else
 
Tools_and_Tights said:
If a person were to use a powered worksharp belt sharpener, and the friction caused the blade to get hot enough to mess up the tempering, does the toughness drastically drop to that of regular CPM 3v or even less than that meaning even lower toughness than regular CPM 3v)
Click to expand...
I'm my opinion...

I have multiple sharpeners including a ken onion work sharp

A hapstone v7 and venev stones with the ease of sharpening of D3V ..... I don't think of anything else to sharpen them on
 
Tools_and_Tights said:
Is the basic field knife in cruwear like an inside joke or are there really going to be CPK knives in cruwear?

Is there a thread someone can’t point me to that discusses CPKs experiences with cruwear?

Thank you everyone for your time!
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#NotNathan

Random Thought Thread

Now that you mention that*, I noticed something which I had not as I ran up north the I-5 corridor here in CA. I hope that this post does not degenerate into something poly-dick-all and BS of that nature because it is just an observation of some half-wit dumb-me! So you recall that during the...
www.bladeforums.com www.bladeforums.com

Random Thought Thread

I think you should just throw them in the creek and sell them in a couple years Nate.
www.bladeforums.com www.bladeforums.com
 
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Sagandavis said:
I’ve been using it on cpk delta 3v long before that info came out. Granted, I was using lowest speed and not aggressive belts and I never keep it on there for more than 1 second per inch. With that technique it’s definitely not heating the edge and certainty not enough to screw up heat treatment.

I have ZERO concern my CPKs are less tough because of it. Low grit and high speed might be a different story but I imagine technique plays a larger role than anything else
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FYI coarse belts generally create less heat.......
 
Crag the Brewer said:
FYI coarse belts generally create less heat.......
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I guess that makes sense, less friction? I’ve noticed on other knives where I’ve used low grit I can definitely feel the steel getting hot. I haven’t felt that on higher grit. Could be the user for sure, I’m an idiot and that’s why I buy knives that can withstand dumb dumbs like me.

I should point out, I’m not removing a ton of metal or reshaping the geometry of my CPKs on a belt system. I would follow Nathan’s recommendations for sure. I was just saying I was doing that before I saw that post from Nathan and I don’t think my knives are becoming less tough from low speed belt with very light pressure
 
Tools_and_Tights said:
I would expect the maker to have experience with both lol but what was the feedback comparing the delta cruwear vs delta 3v?
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#NotNathan here's what Nathan has said about it earlier.

Nathan the Machinist said:
Cruwear will not have better corrosion resistance than Delta 3V

Delta 3V is not like regular 3v. There is much more free chrome. Enough that it is practically stainless. I have a blade that I threw in a stump a long time ago and it doesn't have a speck of rust on it.

Our Cruwear will have less free Chrome because it has higher carbon that's going to compete for some of that Chrome.

The higher carbon also makes it more susceptible to retained austinite which limits how much carbon I can put into solution which ties my hands with aust temp much more so than 3V (if using a low temp tweak). Those knives in the picture above, they all rockwelled about the same. The one on top has RA. The one on the bottom is an industry standard control exhibiting the typical crumbly mushy edge of the high temp. The one in the middle is nicely optimized. This optimization is not just time and temp, there are other important variables.

Although Delta 3V is quite tough, I have not been able to coax good edge stability out of it at higher hardnesses. Cruwear should give me another point or two anyway and actually be tougher than 3V would be at that hardness.

We race 4V at 64 regularly. It has low corrosion resistance though. But it has very superior edge stability for a complex steel.

We're in pursuit of better edge retention in a durable knife. That has always been the focus. And we understand that edge retention is not the same thing as wear resistance. At least not how it is measured in industry, which has little to do with a normal cutting tool. Edge stability is key and a strong uniform microstructure wins the day over secondary carbide volume fraction. Obviously.
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And here's what he stated when asked today.



View attachment 2218163View attachment 2218164
 
Ive got a question for you Nathan!...
Are there any video footage of the SHIV?
Such as destruction demo or is it your waiting
For the SHIV 2.0 to make a video showing the difference between the two?

NMFrank87
 
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