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Thread: How to Sharpen a Gyuto

  1. #1
    Senior Member ThEoRy's Avatar
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    How to Sharpen a Gyuto

    This comes up every now and again so I made a new video on the subject. Question or comment below.

    Starting this harvest I'm a starving startling artist/
    Lyrical arsonist it's arduous spitting this smartest arsenic/

  2. #2
    daveb's Avatar
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    Like it.
    Dave
    Older and wider.

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    Senior Member larrybard's Avatar
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    Rick, Thank you. Do I understand correctly that due to the geometry of this gyuto you are making the angle of the edge on one side twice the angle of the other side? When you sharpen you hold the handle in your right hand, but when you "blend" on the 5k and when you strop with trailing strokes to deburr you shift hands for each side. You do that because you just happen to find it more comfortable?

  4. #4
    Senior Member ThEoRy's Avatar
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    Yezzir the stropping motion is easier for me in both hands while I adapted the 1 hand sharpening technique to prevent getting **** all over my handles. The angle is def. lower on the front though how much I can't say.
    Starting this harvest I'm a starving startling artist/
    Lyrical arsonist it's arduous spitting this smartest arsenic/

  5. #5
    Senior Member larrybard's Avatar
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    Sorry, I didn't mean one angle might be twice the other; I meant 50% greater (e.g., 8 degrees and 12 degrees).

    It's a long time since I took trigonometry, so I might be mistaken, but it seemed to me that if on one side you were elevating the spine by a certain height, and the other side 50% higher -- e.g., by the widths of two pennies and three pennies, respectively -- that the difference would correspond to a 50% change in angle.

  6. #6
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    Wow, those are some acute angles. It's been a while since I've done trig as well, but assuming a 48 mm blade height and a penny width of ~ 1.5 mm, I'm calculating an angle of 3.5 degrees on the right face and 5.4 on the left. sin (x) = (#pennies*penny width)/blade height <- am I doing this right?

  7. #7
    Senior Member Benuser's Avatar
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    That's correct. If you have the pennies disappearing under the blade instead of being next to it, it becomes all much more reasonable. And you should add the blade's slope to have an idea what the angle is between stone and blade's axis.

  8. #8
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    I use wooden triangles cut from balsawood and placed on the stone to set the correct angles, much more precise, quicker and less hassle than the penny method. Also, with the triangles you always get the same nagle for all your knives, no matter how tall the blade is.

    I have triangles at 21, 18, 15 and 12 degrees, but of course anything goes. The actual angle will of course be very slightly higher becaue most blades have that very acute wedge shape/cross section.

  9. #9

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    I usually just maintain the same existing angle on the edge. I'll first find the edge's angle by feeling when it bites the stone, then I'll hold that angle for that side.

  10. #10
    Senior Member Cheeks1989's Avatar
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    Good video.

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