Blackjack Grunt Video Destruction Test Completed

[Noss]

Enjoy the videos. :) They were made for you :thumb:


Part 1
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Part 2
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Part 3
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part 4
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Part 5
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[itxploded]

good job Noss!

[will york]

Surprising that the spine impacts with the mallet resulted in so little damage to edge or spine on the concrete, considering how brittle and weak the blade seemed under any lateral stress. I don't think I've seen that combination of characteristics before--almost as if the internal structure of the blade was somehow oriented to be strongest in cross section across the blade's width at the expense of lateral strength. What the heck did I just say? :confused:

Bottom line, it seems strange that impact is resisted well, but not lateral stress loading. Makes me wonder why that would happen.

Thanks Noss!

[culpeper]

Nice job. $25 knife took a beating. Can't ask for more than that.

[miro44one]

Cool test, I guess you get what you paid for.
It does look like a pretty good knife for general cutting chores, though. But not very useful for me.

[Macgregor]

Good $25 beater.
Have been looking at picking one up for awhile.

I bet it didn't resist lateral stress we because of the steel.
10cr17mov is like 154cm which is itself not famous for being made into prybars.

[sharpshooter996]

Great test Noss, Nice looking knife and i say worth the $25. Not as strong as some of the other cheap knives like Rough use knife and GI Tanto but I think it will serve its purpose well.

Look's like you got Busse Pinky when you were chopping. Sounded like me when I use the Skinny Ash for chopping.

Thanks again, you have our loyal support. Looking forward to future tests. I have to say I like to see these cheap knives being tested. Many show that you dont have to spend a lot of dough to get a useful knife.

[Noss]

Your welcome men.

[Paul The Brit]

(Another) Great test Noss! Keep up the good work. It's good to see cheaper knives getting Noss'd, I'd play nice with my S6 but a knife that cheap would get HARD used..

More, more! :D

[kurodrago]

Nice test Noss, I din't know this brand but it seems strong knife.
The steel that's used is hard stuff damn it:rockon:

[zenlifter]

Great Test as usual.
I think the blade design of this knife was kinda unique looking in a good way.
The catastrophic tip failure did it in for me though.
Still, for $25, it seems to be good product for the money.

[Noss]

Your welcome men. Thanks.

[me2]

I'm back, hahahaha. Not really, I've just always wanted to say that. Will, I've toyed with the notion of getting some wide flat plate and making small knives out of it to have the rolling direction of the plate go from spine to edge of the knife. That may be what happened here. Steel generally has better properties in the rolling direction, and that puts the edge in a favorable orientation. As the tip curves away, it could explain the tip breaking, since its stress would be perpendicular to the rolling direction. Assuming this is indeed what happened. Currently, we have only wild speculation (mine).

[will york]

I'm back, hahahaha. Not really, I've just always wanted to say that. Will, I've toyed with the notion of getting some wide flat plate and making small knives out of it to have the rolling direction of the plate go from spine to edge of the knife. That may be what happened here. Steel generally has better properties in the rolling direction, and that puts the edge in a favorable orientation. As the tip curves away, it could explain the tip breaking, since its stress would be perpendicular to the rolling direction. Assuming this is indeed what happened. Currently, we have only wild speculation (mine).

That's a very interesting theory and makes a lot of sense. I've never seen it explored, have you? Seems the only way you could get away from the structural orientation imparted by rolling might be by forging--or casting, as David Boye does with his dendritic stuff.

Very intuitive--thanks!

[me2]

I think I read that Darrel Ralph had tried it with D2 with some success. I suspect that if the forging were done on hot rolled flat bar, the effect would be difficult to eliminate. Forging would just stretch out the insoluble inclusions in a different direction. Perhaps starting with ball bearings or round shafts would do the trick.

[will york]

I think I read that Darrel Ralph had tried it with D2 with some success. I suspect that if the forging were done on hot rolled flat bar, the effect would be difficult to eliminate. Forging would just stretch out the insoluble inclusions in a different direction. Perhaps starting with ball bearings or round shafts would do the trick.

could be one reason why blade smiths have found improved performance using ball bearings and round bar in steels like 52100, over rolled flat bar...

Thanks again, me2.

[ktomes_340]

good test noss. i enjoyed it very much. i ordered 1 from New Graham knives, and i should get it in the morning. if anybody else wants to get 1, remember they are discontinued and hard to find. New Graham only has 4 left now.

[psy-ops]

great test! I have been asking for this for a long time.
Thanks

I bought one recently. I haven't really used it that much, yet. It held up well.

For me I think the concrete test are the most telling. The grunt seemed to pass that test well enough.

[Magnum22]

That's a very interesting theory and makes a lot of sense. I've never seen it explored, have you? Seems the only way you could get away from the structural orientation imparted by rolling might be by forging--or casting, as David Boye does with his dendritic stuff.

Very intuitive--thanks!

it's done for axes. it would make sense but i think the grunt was just extra hard with a tight grain structure. brittle enough to snap under stress, hard enough to make the hammer and concrete take the damage of the impacts.

[Spanish-knifeman]

Is the Grunt a full tang blade knife?

[Noss]

Yes for the most part it is. I'll post a pic of it with the handle removed.

[Noss]

Photo of Blackjack Grunt Tang.

http://knifetest.com/forum/attachment.php?attachmentid=427&d=1242440934

[Magnum22]

pretty nice tang there.

[Noss]

It ain't bad.

[Spanish-knifeman]

Thanks Noss, It's a nice full tang. And what's the blade thickness?

[Noss]

No problem. I think 3/16 thick but I need to recheck to be sure. I'll be back with the info.

[Noss]

Yes it's 3/16" thick

[Spanish-knifeman]

Thanks for the info, I've been searching this technical spec everywhere but I couldn't found it.

[Noss]

No problem. Glad I could help.

[me2]

I've been rereading some of these older threads and find them still entertaining. Will, it seems we (knife enthusiasts in general, not you and I specifically) have some circular reasoning to deal with. Boye's cast blades are done that way to take advantage of the cast microstructure and properties. After wearing out one of his dendritic 440C blades, I can attest that the edge holding is good, and brittleness, for pocket knife use, is not an inssue. However, while hot rolling has its issues, its done specifically to eliminate the disadvantages of the cast structure. It again comes down to knowing what one wants a knife to do and choosing steel accordingly. Of course, before reaching this conclusion, one must realize there is no perfect steel, otherwise steel companies would only make it, and not the umpteen million kinds they do now.