Grinding Jigs - getting that crispy Shinogi at the tip

Discussion in 'Shop Talk' started by erezj, Dec 6, 2018 at 5:29 PM.

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  1. Dec 6, 2018 at 5:29 PM #1

    erezj

    erezj

    erezj

    Well-Known Member

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    I'm a small time knife enthusiast, my particular favorite is Wrought Iron San Mai with strong distal taper and crisp Chisel grind...but after building about 7 knives I still haven't been able to get that crisp shinogi all the way to the tip.

    no problem with 70% of the knife, just the tip when it becomes so thin and sweeps up.

    Tried using a basic wooden block jig with two screws to fix the angle, tried free hand...got reasonable success, but not where I want it to be

    appreciate any advice
     
  2. Dec 7, 2018 at 10:41 AM #2

    Kippington

    Kippington

    Kippington

    A small green parrot Hobbyist Craftsman

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    Have you considered a slightly concave grind (i.e. large radius wheel)? They really seem to help for the bulk of the work, then you can change it to a flat quite easily by hand once the bevel is almost complete.

    There's some more info here about distal taper and its effect on the shinogi line:
    https://www.kitchenknifeforums.com/threads/commission-wip.34734/

    [​IMG]
     
  3. Dec 7, 2018 at 12:31 PM #3

    erezj

    erezj

    erezj

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    Kip, had a blast reading the thread you shared!

    And, ya man, your knives are amazing + your knowledge sharing is, for me, what this community is all about !

    However...if was quite challenging for me to reach a conclusion...

    so followup question:
     
  4. Dec 7, 2018 at 12:34 PM #4

    erezj

    erezj

    erezj

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    [​IMG]

    If I analyze the diagram Kip shared above, my conclusion is that the only way to make a Shinogi parallel to the edge in a strongly distal taper knife, is to do it free hand and slowly raise the angle the closer I get to the tip
     
  5. Dec 7, 2018 at 1:37 PM #5

    Kippington

    Kippington

    Kippington

    A small green parrot Hobbyist Craftsman

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    I'm glad you enjoyed it, but if you read further you'll see there's another way. It involves the flats being not quite flat/parallel.
     
    milkbaby likes this.

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