Edge angles, you have nothing to worry about

SpyderPhreak said:
I'd like to see you put your money where your mouth is. :p Cobalt has already sacrificed for the greater good here. Step up next, won't you? ;) :thumbup:
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LOL, all this talk of sacrifice and the greater good… I almost thought you were a politician! Your sense of humor is well suited to the job... perhaps you missed your true calling in life ;) :D

On a serious note (sarcasm off), I am not sure what this 'test' seeks to prove… but I can say that it certainly does prove one thing :

If you take a knife (meaning a cutting tool which has knife-like edge geometry that is designed to cut objects reasonably well such as wood/plastic/softer metals/etc… rather than a knife-like object which has cold chisel edge geometry) and try to use it as a cold chisel you will not like the end results.
 
So that is a Carothers blade with his HT. Like I said in the beginning this is not a comparison for several reasons. Different edge angles, and different blade profiles and probably different Rc's. So this is just to show that if you are not attacking tough steel, these blades with very thin edges can take more abuse than any wood could ever give them. Both blades are in the 0.15" thick stock. Very thin.

I sacrificed the kabar war sword as a test blade on the same cement nails to show how hard and tough those nails are. The war sword actually broke in half in less than two minutes. Again, this proves that it is a severe test and does not mean that the war sword is not a good blade. I honestly expected the other two to fail as well. But they did not and that was the impressive part.
 
Azula Gun Holsters said:
Will Busse replace the knife for you ?
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Busse fixed it and sent it back to me.

I did not ask Busse to do that as it was an intentional destruction attempt, that I failed to do. But he replaced it anyway. I also did not ask Ka-bar to replace their broken knife. I just threw it away.

meaner
[video=youtube;zzpL9CW_AJA]https://www.youtube.com/watch?v=zzpL9CW_AJA[/video]


3V
[video=youtube;e1OaTXHCPmE]https://www.youtube.com/watch?v=e1OaTXHCPmE[/video]
 
I wonder how much better the blades would have held up if the nails were backed by a harder surface that didn't allow them to bend, and then pinch on the blades.
 
clampdaddy said:
I wonder how much better the blades would have held up if the nails were backed by a harder surface that didn't allow them to bend, and then pinch on the blades.
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much better as they would have cut cleanly through I would think. But I would have run out of nails.
 
Maggot Brain said:
LOL, all this talk of sacrifice and the greater good… I almost thought you were a politician! Your sense of humor is well suited to the job... perhaps you missed your true calling in life ;) :D
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Perhaps, maybe you should try using just one of the plethora of Busse blades that passes through your hands sometime, and then I might place a wee bit more validity in your opinions on Busse edge/blade geometry. ;) :rolleyes: :thumbup:

What Cobalt has done here is to personally find out where the "edge" (pun fully intended) of the performance envelope lies for these steels, and then to share it with the community here that most of us are an active part of. Ever done that with a Busse? That was actually yours? I really doubt it. However, like Cobalt, I use my Busse knives hard, and I have pushed them to their limits and unintentionally beyond, so I know what they can and can not do. ;)
 
Both very tough steels. And how do we know unless someone wails on them? Thanks for posting that Cobalt.

Also, can you give us the background on the blank that came from Nathan? That's not a pattern that I am familiar with from him. It doesn't fit with any GSO pattern that I'm familiar with either (screw holes don't match 3.5 or 4.1). Is this one of the blanks that Guy Seiferd provided to Nathan when they were collaborating on the heat treat tweaks with Dan Keffler? What they now call Delta 3V?

Thanks in advance.

Dave
 
That was one of Nathans test blades with the new HT. yes to your last question.
 
Dang - those spikes are some tough critters!

Thanks for the test vids and pictures.

best

mqqn
 
here is the ka-bar after the fact,

MuVR3J9.jpg
 
Cobalt said:
I also did not ask Ka-bar to replace their broken knife. I just threw it away.

I would have kept the handle half of the broken blade and ground it into a 5" blade knife.

Glad there is somebody crazy enough to try this stuff out.:D:thumbup:
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Man, that hurts. Both the super-steels did well, but it hurt to watch that.
 
I see wharncliffe written all over that. Edge angles for just cutting wood can be very low, as low as 10-12 degrees per side. I have an old Barong machete with an edge down to 17 dps with the edge at 0.01-0.015 inches thick at the top of the bevel. As long as it's only used on wood there weren't any issues. However, wood and rocks travel together sometimes, so you have to find what you're willing to live with in terms of cutting ability and damage potential.
 
I only got an SR 101 TGBG but used it to shave some metal of a piece of 55 rockwell steel (don't ask). The edge is convex and terminates at 25 degrees (inclusive). There was no visible edge damage.
 
me2 said:
I see wharncliffe written all over that.
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The meaning of that is lost on me. What did you mean?


me2 said:
Edge angles for just cutting wood can be very low, as low as 10-12 degrees per side. I have an old Barong machete with an edge down to 17 dps with the edge at 0.01-0.015 inches thick at the top of the bevel. As long as it's only used on wood there weren't any issues. However, wood and rocks travel together sometimes, so you have to find what you're willing to live with in terms of cutting ability and damage potential.
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or better steel and HT. like what happened above. But overall yes, you can take on damage. The difference is how much damage. The ka-bar suffered gross failure in 1/3 the time of the other two which took on moderate damage.
 
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