Next stones to buy for sharpening (?)

The 4000 stone does polish very well. I'm thinking I'd have to test it against a stone of similar grit to give a fair review. It has a very ceramic feel to it.
 
Bjorn1,
I look forward to hearing more about the Hayabusa 4k. Is it as good as the choresa 3k, or a Shapton Pro 5k finishing stone, or Suehiro Rika 5k?
Tall order, here. I'll take what I can get-:).
 
Problem is, I've bought a Sigma Power Ceramic II 220 and a 1200, as well as a chosera 400. I might get another Chosera at around 1000/2000 but I'm not sure about getting another stone close to 4000 :)

But once I'm playing around with these various stones and my superstones I guess some comparison of qualities can be made...

I tried to grind an axe with my 220 superstone, it dished something terribly. Axe turned out nice though in the end :)

Decided on the Sigma II:s to get faster cutting to reset/change bevels etc and to get a good edge on harder tool steels faster.

The Chosera 400 I'm thinking is a first stone for knives that are worn but don't need to be reset, or an intermediary stone between the 220 and either the 1000 superstone or the 1200 Sigma.

On my tomb stone it shall be written: "He had many, large, stones" :D
 
I recently bought the 400 chosera. I find it much faster than the 400 sigma. I haven't done a head-to-head, but the chosera 400 made short work of a project knife I had been grinding away at forever with a Shapton 120.

The chosera 1000 is my favourite stone (the only other 1k stone I have is a King, though). I bought one for a friend of mine too. I currently have the following choseras: 400, 1k, 3k, 5k + snow white 8k, but the 400 and 3k are new (they were on sale) so I don't have that much experience with them yet. The plan is to see if I can phase out the 5k now that I have the 3k.
 
Bjorn1 said:
You think a chosera is close to the superstones at 3k?
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I can't say, I sold my 3k Chosera long before I got the super stone. Both are made with the same abrasive but different binder and thus they perform differently, the Chosera should be more aggressive.
 
The Chosera 3k and SS 3k are miles apart. The SS are some of the softest stones while the Chosera are some of the hardest.

The 400 Chosera is one of the fastest cutting and smoothest grinding stones available. Said to be faster than a Shapton 120 while leaving a fine scratch pattern easily removed by any 1k.
 
Jason B. said:
The Chosera 3k and SS 3k are miles apart. The SS are some of the softest stones while the Chosera are some of the hardest.

The 400 Chosera is one of the fastest cutting and smoothest grinding stones available. Said to be faster than a Shapton 120 while leaving a fine scratch pattern easily removed by any 1k.
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what is your criteria for hardness?
The Chosera produces a lot more mud than the super stone, that means that the binder is pretty easy to break up, which is a characteristic of a soft stone.
Super stones are hard stones in that regard and Chosera are not. It is exactly the same as with naturals, more specifically Japanese naturals, Japanese synthetics are made to some extent to mimic natural stones. Hard naturals release almost no particles , soft release a lot.
 
mainaman said:
what is your criteria for hardness?
The Chosera produces a lot more mud than the super stone, that means that the binder is pretty easy to break up, which is a characteristic of a soft stone.
Super stones are hard stones in that regard and Chosera are not. It is exactly the same as with naturals, more specifically Japanese naturals, Japanese synthetics are made to some extent to mimic natural stones. Hard naturals release almost no particles , soft release a lot.
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That's not exactly how it works, actually, mostly wrong.
 
Stone hardness is generally gauged by how much or how little gouge resistance a stone has. In the case of the Chosera the overall hardness is very high making them wear slowly and be very resistant to gouging. The SS are on the opposite end of the spectrum, their softness often described as chalky or clay like.

The mud you refer to on the Chosera stones is mainly swarf from the blade with a very fine bit of stone mixed in. Being hard and slow to wear the Chosera stones create more of a swarf-mud.

The super stones from about 1k and down are waaaay more muddy as in the abrasive release, this makes for a really fast stone but one that does not last long. Above 1k the stones load heavily collecting much of the removed metal on the surface which then must be lapped off.

Natural stones are a whole different ball game, the Chosera stones would be the best synthetic comparison but even then it's a very individual subject.

Btw, I've used all the stones from each set and have a excellent working knowledge of most Naniwa stones.
 
Jason B. said:
Stone hardness is generally gauged by how much or how little gouge resistance a stone has. In the case of the Chosera the overall hardness is very high making them wear slowly and be very resistant to gouging. The SS are on the opposite end of the spectrum, their softness often described as chalky or clay like.
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softness is related to slurry release not how the stone feels. Soft stones are usually low grit stones, and this is no a surprise, as more slurry released in the mud means faster cutting action. To polish the bevels successfully one has to use harder stones, that is the purpose of higher grits, they get increasingly less willing to release particles in the slurry thus providing more polishing.

The mud you refer to on the Chosera stones is mainly swarf from the blade with a very fine bit of stone mixed in. Being hard and slow to wear the Chosera stones create more of a swarf-mud.
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I refer to slurry from the stone not swarf, one is stone abrasive the other is metal particles from the steel, pretty easy to tell the difference.
I hone a lot of razors and as you probably know razors require a lot less pressure to hone. Even with that 1k Chosera produces slurry as it goes, not a lot but it is there. That is observation over 2 1k Chosera now.

Above 1k the stones load heavily collecting much of the removed metal on the surface which then must be lapped off.
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That has to do with the binder, it is resin by the way, but also tells you that the stone is not too willing to release abrasives, which is what harder stones do.

Natural stones are a whole different ball game, the Chosera stones would be the best synthetic comparison
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Not really, there is no synthetic counter part to natural stones. Of coarse we are talking about Japanese natural stones vs synthetic stones (most of them Japanese made). Natural stones slurry works in a way that can't be duplicated with synthetic abrasives, not yet at least. The closest to naturals are stones with natural and synthetic mix, or two different size abrasives

In essence Chosera is more loaded up version of Super Stones, they have the same abrasive used in them, but Chosera has more of it, and different binder. Choseras are more aggressive than super stones, and produce more toothy edges.
 
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