So, based on the conversation we had below I'm going to add a qualification to what I said about the Naniwas being 'soaking' stones. My understanding of the proper procedure for the use of the Naniwa Gouken Arata stones, is that they should be soaked for a few minutes before use. They should absolutely NOT be soaked for a long time, and certainly should not be soaked 'until the bubbles stop'. It's not that kind of stone. If you soak it for a long time (> 20 minutes) the stone could start to separate and be ruined.
Shapton Kuromaku has a 120 and a 220 grit. The only difference between the Rockstar and Glass stones is that the Rockstar are thicker with NO glass backing. That is straight from an email I got from Shapton themselves, otherwise they use the same abrasive and binder (magnesia). Usually the difference in price in the 16k Rockstar and Glass is all of them up to the 16k use WA (White Alumina) abrasive, and the 16k is CA (Calcined Alumina). I replied to the other commenter, but the Arata stones are considered "baby chosera" essentially. The Green Brick of Joy is called the Aotoishi.
I'm looking for coarse stone for removing chips on my kanna blade, can you tell me, which one i should to buy chosera 400 or rockstar 320? I used shapton pro 220 before, i think it's so soft and not really good for keep flatten
Are the chips large or small? My inclination is that either one of the stones you mentioned should be fine for small chips (though, I prefer working with the Naniwas, it's a subjective difference). If the damage is more severe, you should probably look into a diamond plate.
Naniwa gouken arata is also called Naniwa pro and is probably identical to Naniwa chosera except for thickness. These stones should not be soaked, as they will degrade in water, soften, crack or disintegrate over time if soaked.
There's a video floating around which shows a tour of the Naniwa factory. It's in Japanese, so the translation might be a bit off, but one of the execs said that you shouldn't allow the stone to soak for more than 20 or 30 minutes...the implication being that they should soak for less than 20 minutes. I generally find that 5 minutes does the trick for me. If I don't soak them at all, I spend more time spraying than sharpening.
@@Justsomeretiredguy So the standard is "soak them until the bubbles stop" then keep them wet in regards to soakers. If it's classified as need a "short soak" and no bubbles, then yet, 5 to 10 minutes is typical. If it's a Magnesia binder, they don't typically require a soak and are splash n go. If they are Vitrified and / or a clay binder matrix (this of course depends on manufacturer though) Such as the King deluxe series, they are soakers that can be permanently soaked in water without harm and just pulled out when ready to use. But I am pretty sure that all the Naniwa stones in the Arata and Chosera lines are splash n go, and aside of their "first time", they should not be soaked due to potential issues. As long as it's not longer than the 5 or 10 minutes, you will be fine.
Hey man I retired this year and I love my stones and knives. You got a new subscriber
Hi, is the hayabusa dishing out fast? Very informative video! thank you 🤘
So, based on the conversation we had below I'm going to add a qualification to what I said about the Naniwas being 'soaking' stones. My understanding of the proper procedure for the use of the Naniwa Gouken Arata stones, is that they should be soaked for a few minutes before use. They should absolutely NOT be soaked for a long time, and certainly should not be soaked 'until the bubbles stop'. It's not that kind of stone. If you soak it for a long time (> 20 minutes) the stone could start to separate and be ruined.
Shapton Kuromaku has a 120 and a 220 grit. The only difference between the Rockstar and Glass stones is that the Rockstar are thicker with NO glass backing. That is straight from an email I got from Shapton themselves, otherwise they use the same abrasive and binder (magnesia). Usually the difference in price in the 16k Rockstar and Glass is all of them up to the 16k use WA (White Alumina) abrasive, and the 16k is CA (Calcined Alumina). I replied to the other commenter, but the Arata stones are considered "baby chosera" essentially.
The Green Brick of Joy is called the Aotoishi.
Yes, I saw the Kuromaku 120 and 220 right after I made the video...naturally.
I'm looking for coarse stone for removing chips on my kanna blade, can you tell me, which one i should to buy chosera 400 or rockstar 320? I used shapton pro 220 before, i think it's so soft and not really good for keep flatten
Are the chips large or small? My inclination is that either one of the stones you mentioned should be fine for small chips (though, I prefer working with the Naniwas, it's a subjective difference). If the damage is more severe, you should probably look into a diamond plate.
good vid... assuming that's a POW/MIA bracelet, don't see many of them any more.
It's a memorial bracelet for a KIA.
Naniwa gouken arata is also called Naniwa pro and is probably identical to Naniwa chosera except for thickness.
These stones should not be soaked, as they will degrade in water, soften, crack or disintegrate over time if soaked.
Naniwa Arata is translated (supposedly) as "baby chosera".
There's a video floating around which shows a tour of the Naniwa factory. It's in Japanese, so the translation might be a bit off, but one of the execs said that you shouldn't allow the stone to soak for more than 20 or 30 minutes...the implication being that they should soak for less than 20 minutes. I generally find that 5 minutes does the trick for me. If I don't soak them at all, I spend more time spraying than sharpening.
@@Justsomeretiredguy So the standard is "soak them until the bubbles stop" then keep them wet in regards to soakers. If it's classified as need a "short soak" and no bubbles, then yet, 5 to 10 minutes is typical. If it's a Magnesia binder, they don't typically require a soak and are splash n go. If they are Vitrified and / or a clay binder matrix (this of course depends on manufacturer though) Such as the King deluxe series, they are soakers that can be permanently soaked in water without harm and just pulled out when ready to use. But I am pretty sure that all the Naniwa stones in the Arata and Chosera lines are splash n go, and aside of their "first time", they should not be soaked due to potential issues. As long as it's not longer than the 5 or 10 minutes, you will be fine.