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how to fix shinogi line and uneven blade geometry?
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Thread: how to fix shinogi line and uneven blade geometry?

  1. #1
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    how to fix shinogi line and uneven blade geometry?

    Hey guys i have a single bevel blade that i got off Jbprince a long time ago before i even knew what a single bevel was. I remember being in horror when i went to wipe the garlic off the backside of the blade only to find my finger in shreds haha.

    anyways the shinogi line has never been straight and if you look at the edge it almost looks warped like its at a slant, however the spine is perfectly straight.

    i have tried with a marker to hit certain spots and fix it. i have made it better however its still not how id like it to be. i always make sure to lap my stones and rotate through the process with single bevel.

    I cant seem to get this right no matter how hard i try, i spent about an hour the other night and to no success. On another note the thing takes and extremely scary edge even of a 2k stones.


    IMG_6269 by jgraeff2, on Flickr


    IMG_2084 by jgraeff2, on Flickr


    IMG_3062 by jgraeff2, on Flickr

    i am giving this to snowbrother to help him was hoping to fix it a bit first. any suggestions

  2. #2
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    I've only done some minor work on my own single bevel knives, so, I'm no expert. But from what I see, this knife needs a lot of work.

    First, the shinogi line is wavy, which isn't such a big deal, but the primary bevel from the edge is seriously wavy. This, based on my limited experience, is because inconsistent pressure was used when sharpening. Single bevel knives, more so that double bevel knives, require a light, consistent touch when sharpening. (The primary bevel and secondary bevel also seem to have been blended, but that's not a big deal from what I understand.)

    Second, is how the shinogi line and the bevels toward the tip area have been seriously curved upwards. It looks like a lot more pressure and work has been put toward the front half of this knife and the front inch or so where it appears that there are several different levels of sharpening.

    You may want to consider sending this off to Jon at JKI.
    Michael
    "Don't you know who he is?"

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    i will leave that up to him i got the knife for like 50 bucks and i didnt know much about it, havent used it since culinary school and only been sharpened yesterday when trying to fix it, it was sent to me like that but i never thought anything of it back then.

    It works very well i know that going to send it out to him and see if he can utilize it for now, hopefully he can fix it himself.

  4. #4

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    The shinogi line does no work - the cutting edge does - but you knew that. In other words I doubt that the cutting edge cares what the shinogi line is doing. I have discovered that it is purely aesthetic on some level.

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    Senior Member Jmadams13's Avatar
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    I agree with mike. Some of my best cutters have lines like a blind monkey was doing the grinding
    "This is grain, which any fool can eat, but for which the Lord intended a more divine means of consumption.. Beer!" -Robin Hood, Prince of Thieves, Friar Tuck

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    I agree with the previous posts, but as a general practice when you send your knives in for professional Japanese sharpening services,
    is bevel work included in basic sharpening?
    Or do you have to specifically ask for refinish up to the shinogi?

  7. #7

    JBroida's Avatar
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    unless otherwise specified, most japanese knife sharpeners will do the entire blade road (from shinogi line down).

  8. #8
    Senior Member cwrightthruya's Avatar
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    Quote Originally Posted by xuz View Post
    I agree with the previous posts, but as a general practice when you send your knives in for professional Japanese sharpening services,
    is bevel work included in basic sharpening?
    Or do you have to specifically ask for refinish up to the shinogi?
    This depends on who you send it to. I believe Jon at JKI does it automatically, while others do not.

    @jgraeff---As has been said before, a straight shinogi line is not necessary for a knife to function well. You need a straight bevel and a straight edge with good geometry and that is all. You have to remember that the sides of the knife were ground or hammered before the bevel was cut. So, in essence you can have a dead flat/straight bevel while still having a terrible looking wavy/slanted/tilted shinogi line because this line is the function of where the two planes meet.
    At Death's Door You Only Have 2 choices. Die Happy or Die Regretfully.
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  9. #9
    Senior Member cwrightthruya's Avatar
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    As an example: I have a Nakiri that I know has very straight bevels, and the shinogi line is wavy as hell. But, this was also hand hammered with a karouchi finish.
    At Death's Door You Only Have 2 choices. Die Happy or Die Regretfully.
    Knowing this...........Choose 1 and Live!!!!!!!!!

  10. #10

    JBroida's Avatar
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    single and double bevel knives will be different in the sense of the shinogi line

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