Sebenza cardboard cut test

[Blowpop]

I recently moved and have several empty boxes left over so I decided to do a cut test.

I used the same box of cardboard (largest Uhaul box) and cut the same dorection in the cardboard for every cut.

I tested the sharpness on printer paper after every 300 inches of cardboard was cut.

Before I started, it could shave the hair on my arm.

I stopped cutting after 4,995 inches of cardboard had been cut, since I figured I was nowhere near finding the point where it would stop cutting like butter. The printer paper cut almost just as easy as when I first started and it would still shave the hair on my arm (with a bit more effort than at the start, but still shaved)

4,995 inches of cardboard and still super sharp. I estimate at least another 10,000, or so before it would start to show signs of dullness.

I have a 17° primary bevel, with a 25° micro bevel.

Very impressed with how well the blade performed. I know this info may be redundant but it was my attempt to try putting a sebenza through an indoor controlled test to see how well it would work.

If enough of you want me to, I can push this to the point where it will no longer shave arm hair or cut printer paper.

Let me know what y'all think!

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[banana-clip]

Thats very impressive almost 5,000 inches of cardboard and still shaving sharp. Thats a pile of cardboard.

I'd be curious to how much cardboard it would cut before it's dull, but my guess would be double that 10,000 inches.

What kind of steel is the blade?

 

[NJBillK]

Not bad, we're you cutting with the ribs or against, on a bias or perpendicular to the face of the board?

I can double walled cardboard and while I do have a Sebenza (large 21, s35vn), I noticed that my ZT 770 in M4 and my Cruwear Manix will outlast th Sebenza by a large margin.

 

[Basp2005]

Very cool. I like expensive knives that are more than just pocket jewelry.

 

[Blowpop]

Thats very impressive almost 5,000 inches of cardboard and still shaving sharp. Thats a pile of cardboard.

I'd be curious to how much cardboard it would cut before it's dull, but my guess would be double that 10,000 inches.

What kind of steel is the blade?

Blade steel is s35vn, HRC of 59-60 but if I had to guess for this one it would probably be on the higher end.

 

[Blowpop]

Not bad, we're you cutting with the ribs or against, on a bias or perpendicular to the face of the board?

I can double walled cardboard and while I do have a Sebenza (large 21, s35vn), I noticed that my ZT 770 in M4 and my Cruwear Manix will outlast th Sebenza by a large margin.

This was thick cardboard, harder than most cardboard. It was single walled but the walls are thicker than normal single walled cardboard. As far as being out lasted by other blades, I have owned lots of knives the last few years and I would agree with you on the old sebenza hardness being out performed. This one is of the newer batch, and I also added a sharper angle to the edge than factory. It seemed to come with between 22 and 25 degrees on each side. After I sharpened it to 17, with a micro of 25, it cut like butter through pretty much everything.

I am sure it could be out performed by other harder steels but with the new edge angle, and toughness of s35vn, plus the new hardness is a huge win. Perfect for if the edge hits metal on accident, and can cut like a laser.

 

[whitty]

Very cool post! I hope you do realize you cut over a football field of cardboard. That is a lot of cardboard!

 

[Blowpop]

Very cool post! I hope you do realize you cut over a football field of cardboard. That is a lot of cardboard!

Thanks! Haha I didn't even think of that, pretty crazy.

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[Blowpop]

Very cool. I like expensive knives that are more than just pocket jewelry.

As do I

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[The Aflac Duck]

The way that cardboard is manufactured will give you inconsistent results for your "test". Some cardboard will be hell on an edge and some others will be like cutting paper. I'm not saying that the Seb is a bad knife; they are some of the best around IMO. All I'm saying is that a cardboard cutting test is far from "controlled".

 

[Blowpop]

The way that cardboard is manufactured will give you inconsistent results for your "test". Some cardboard will be hell on an edge and some others will be like cutting paper. I'm not saying that the Seb is a bad knife; they are some of the best around IMO. All I'm saying is that a cardboard cutting test is far from "controlled".

True, it was controlled in the fact that it was cardboard from the same box, and cut in the same direction. There are many inconsistancies when using different types of cardboard.

In this peticular test it is easy to replicate since it was controlled in the best ways possible.

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[Blowpop]

The way that cardboard is manufactured will give you inconsistent results for your "test". Some cardboard will be hell on an edge and some others will be like cutting paper. I'm not saying that the Seb is a bad knife; they are some of the best around IMO. All I'm saying is that a cardboard cutting test is far from "controlled".

Also Im not saying the seb is the best knife, but it performed a lot better than I thought. Especially after re profiling the edge.

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[The Aflac Duck]

True, it was controlled in the fact that it was cardboard from the same box, and cut in the same direction. There are many inconsistancies when using different types of cardboard.

In this peticular test it is easy to replicate since it was controlled in the best ways possible.

Nothing was "controlled"...
Cardboard is not manufactured under a controlled variable.

 

[Blowpop]

Nothing was "controlled"...
Cardboard is not manufactured under a controlled variable.

So you are saying a single sheet of cardboard is inconsistent from one side to the other?

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[The Aflac Duck]

So you are saying a single sheet of cardboard is inconsistent from one side to the other?

Yes. Wood is pulped with Silicon Carbide or Aluminum Oxide (the same stuff that many of us sharpen steel with) which leaves some of said material behind in the wood matrix. There is no standard for how much SiC or AlOx can be contained in cardboard, so like I mentioned, cardboard will either be hell on an edge or will be like cutting paper.

There is a good chance it is consistent, but there is also a good chance it is not. It is completely random!

 

[Blowpop]

Yes. Wood is pulped with Silicon Carbide or Aluminum Oxide (the same stuff that many of us sharpen steel with) which leaves some of said material behind in the wood matrix. There is no standard for how much SiC or AlOx can be contained in cardboard, so like I mentioned, cardboard will either be hell on an edge or will be like cutting paper.

There is a good chance it is consistent, but there is also a good chance it is not. It is completely random!

Thanks for the tip. If it its a serious test and not just for fun I will use a different medium next time.

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[The Aflac Duck]

Thanks for the tip. If it its a serious test and not just for fun I will use a different medium next time.

I'd just keep having fun with that Sebenza, life is to short to worry about tests and such. It is hard to setup a controlled test for edge retention, there are way too many variables!

My CRK's work great for my personal use, which includes cutting cardboard but sometimes I come across a strain of cardboard that is like cutting sandpaper!

 

[Blowpop]

I'd just keep having fun with that Sebenza, life is to short to worry about tests and such. It is hard to setup a controlled test for edge retention, there are way too many variables!

My CRK's work great for my personal use, which includes cutting cardboard but sometimes I come across a strain of cardboard that is like cutting sandpaper!

Absolutely! Life is way to short to worry about things. Long as you have a knife on you, you're doing right, wether its $5 or $5000.

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[Natlek]

Yes. Wood is pulped with Silicon Carbide or Aluminum Oxide (the same stuff that many of us sharpen steel with) which leaves some of said material behind in the wood matrix. There is no standard for how much SiC or AlOx can be contained in cardboard, so like I mentioned, cardboard will either be hell on an edge or will be like cutting paper.

There is a good chance it is consistent, but there is also a good chance it is not. It is completely random!

Frankly to me it looks like as .............. there was hair fiber in the egg

 

[GatorFlash1]

I recently moved and have several empty boxes left over so I decided to do a cut test.

I used the same box of cardboard (largest Uhaul box) and cut the same dorection in the cardboard for every cut.

I tested the sharpness on printer paper after every 300 inches of cardboard was cut.

Before I started, it could shave the hair on my arm.

I stopped cutting after 4,995 inches of cardboard had been cut, since I figured I was nowhere near finding the point where it would stop cutting like butter. The printer paper cut almost just as easy as when I first started and it would still shave the hair on my arm (with a bit more effort than at the start, but still shaved)

4,995 inches of cardboard and still super sharp. I estimate at least another 10,000, or so before it would start to show signs of dullness.

I have a 17° primary bevel, with a 25° micro bevel.

Very impressed with how well the blade performed. I know this info may be redundant but it was my attempt to try putting a sebenza through an indoor controlled test to see how well it would work.

If enough of you want me to, I can push this to the point where it will no longer shave arm hair or cut printer paper.

Let me know what y'all think!

Sent from my SM-N920V using Tapatalk

Tell me again what your bevels are sharpened to. !7 & 25 degress per side seems rather chunky for a folder. I sharpen my M4 steel Gayle Bradley to 15/20 on my Sharp Maker. It cuts very good. I am amazed, but not surprised at how well your knife cuts. That enough testing for me, unless you have a robot to do the job on some double walled cardboard.