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Thread: Why is this guy hammering these Toishi?

  1. #11
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    sachem allison's Avatar
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    sorry,my bad. when we work with stone, we always check for the soundness of the stone by tapping it with a hammer. just assumed he was doing the same thing . sorry for my misinformation.
    I haven't lived the life I wanted, just the lives I needed too at the time.

  2. #12
    Right, but I mean, does this equate to a useful evaluation? Should I start whacking natural stones when I see them to see if they are dense or not?

  3. #13
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    no whacking, just tapping gently.
    I haven't lived the life I wanted, just the lives I needed too at the time.

  4. #14
    Lol I was kidding. But seriously, is this a way we can find out if a stone is a good fit for us without using it?

  5. #15
    Nehh i will not test them like that, you will need to know all sounds from different stones to know what is good and there are also feeling, how stone feels on the knife.
    So it is very approximate guess how hard stone is. And like sachem allison says there may be some lines or cracks that can blok for some sounds.

  6. #16
    I've no idea how long natural stones may take to wear down through sharpening use - if ever - but maybe someone experienced with this can get a feel for if there any inconsistencies within a stone, and thus judge quality based on how a stone wears? Certain stones might also have hidden cracks/lines inside and not seen on sides, and even be more liable to crack over time through use when given pressure or not supported well when sharpening?

    .. I'm just speculating, but interesting to think about. I've just got one nat stone and am wondering what to expect from it over time.

  7. #17
    Quote Originally Posted by Cutty Sharp View Post
    I've no idea how long natural stones may take to wear down through sharpening use - if ever - but maybe someone experienced with this can get a feel for if there any inconsistencies within a stone, and thus judge quality based on how a stone wears? Certain stones might also have hidden cracks/lines inside and not seen on sides, and even be more liable to crack over time through use when given pressure or not supported well when sharpening?

    .. I'm just speculating, but interesting to think about. I've just got one nat stone and am wondering what to expect from it over time.
    Yes, that is the question that is in my mind. When you use a stone over the years, will the figure change significantly? Does Renge or karasu figure change as you go a few mm deeper? And will this change the way a stone works?

    How about non toxic surface lines, will they become more 'toxic' past the surface if their mineral composition changes?

  8. #18
    Quote Originally Posted by sachem allison View Post
    sorry,my bad. when we work with stone, we always check for the soundness of the stone by tapping it with a hammer. just assumed he was doing the same thing . sorry for my misinformation.
    I believe the stones are tested for cracks when they are still slabs before cutting, the sound when tapping can give some idea of hardness.
    One can't tell how good the stone is by tapping on it , one will have to put steel to the stone to determine the quality.

  9. #19
    You have no way of teling it really not for 100 % at least. You have to look on the sides and bottom of the stone if it is uniform, but also many lines or inclusions that is not toxic. So it can also be misleading.
    Karasu or range patterns do not add very much to the stone. But they look very cool

    General if you buy quality stones, they are very uniform hardnes true whole stone, so it will not change to much by performance.

    Quote Originally Posted by Tristan View Post
    Yes, that is the question that is in my mind. When you use a stone over the years, will the figure change significantly? Does Renge or karasu figure change as you go a few mm deeper? And will this change the way a stone works?

    How about non toxic surface lines, will they become more 'toxic' past the surface if their mineral composition changes?

  10. #20
    Though I know mining of natural stones has curtailed a lot these days, do you - Maxim or anyone else - know if new stones or, I guess, old ones are now tested in any other way? Easy to imagine tapping as one traditional way to assess quality. But these days, there must be some devices/technology (more advanced than the hammer) that they can use to give a good idea.

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