Tajima Nakatoishi Japanese Natural Stones Whetstones (JNATs) - Polishing, Sharpening Examples Uses
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- เผยแพร่เมื่อ 6 ก.พ. 2025
- About Japanese Natural Stones (JNATs)
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Japanese Natural Stones (JNATs) Glossary & Kanji
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Japanese Natural Stones - JNAT Visual Definitions Guide
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Nagura & Mikawa Asano Information
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Japanese Natural Stone (JNATS) Use and Maintenance
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Japanese Natural Stones (JNATs) Buying Tips
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Japanese Natural Stone (JNATs) Mines List
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Japanese Natural Stone Strata Information
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Reputable Japanese Natural Stones (JNAT) & Nagura Sellers
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Natural vs Synthetic Whetstones Information:
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Interesting that you can tell so much about the stone just by the sound.
Thanks again for another great and informative video!
Glad you enjoyed this one too Dominic!
I just bought a Tajima as well. The seller offer me two options，an Aizu or Tajima，same size around 2.3kg，good looking stone，but he recommend Tajima over Aizu so i trust him. What he said is Tajima would be more versatile as a medium stone following synthetic 3000 grit
Following 3k Tajima is probably better, but I do prefer the aizu by a long shot or a nagura after it over the Tajima. Hope yours serves you well!
Really enjoy your videos !
Thanks Jay!
Will have to buy and try.
They are interesting!
Enjoying these more and more. You mention sharpening vs polishing, here sharpening. Can you broadly distinguish JNAT distinctions for those two end uses?
So as you can see in the videos, most can be used for both. Usually the largest distinction for a stone being "good" for polishing is that it has uniform grit sizes at a certain coarseness/fineness level. If the stone does not have a consistent grit, it will likely ruin the previous step in polishing with "rogue scratches". Such a stone though may still be useful to sharpen with, where rogue scratches aren't a huge issue and likely will not impact the performance. A great example of an inconsistent stone are almost all Amakusa. Can be used for early stage sharpening, but not typically consistent enough to use for a polishing step. There are stones though with "toxic" elements which could also be bad for sharpening. Did this answer what you were looking for? If not, I can further clarify.
@@naturalwhetstones …I understand your drift, sharpening whetstones don’t lend themselves to polishing where mirror finish is the objective. However you introduce “toxic” and I’m not sure what that implies. Be patient with me, I’m genuinely engaged, like whetstone home sharpening, but miss some of the nuance you introduce.
So a regular inclusion is any foreign particle in the stone that isn't the base material. Almost all visual characteristics like goma, renge, lines, etc. are all a form of mineral or deposit inclusion. When we call something a toxic inclusion, we mean that the imbedded material is coarser or harder than the main stone. This causes "toxic" particles which scratch deeper than the standard grit of the stone or in very bad cases can chip the blade. Most inclusions like renge, goma are softer or finer than the stone so are non-toxic. Make sense?
@@naturalwhetstones …absolutely…thanks for explaining. “Toxic” doesn’t mean break out the masks again, it refers to imbedded particulates, but not consistent with the rest of the strata, sometimes harder, sometimes softer.
Yep!
Hello. have you come across examples with brownish spots in the stone? You mention toxic lineal inclusions, could brown spots be something similar and should these be avoided? Thanks, another helpful video!
Yeah they can have brown spots and usually they are not toxic, but as with all inclusions you have to test to really know.
Thanks for another informative video. I wonder if you could talk about how much pressure you are putting on the blade with your two fingers?
I do think I cover it in a different video already, but usually I would say "like you are finding a pulse". On the lightest side of firmly connected. Hope that helps!
@@naturalwhetstones Perfect description, thank you!
@@simonanstey No problem!
Where are these sharpening stones sold , from whom ?
naturalwhetstones.com/natural-whetstones/reputable-japanese-natural-stone-jnat-nagura-sellers/