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Show your Paper Wheel edges

kwackster May 8, 2017

  1. kwackster

    kwackster Huge member

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    This special version of the Spyderco Paramilitary 2 in CPM-M4 steel & carbon fiber is in use with a Dutch knife forum member.
    A small fraction of the tip had broken off and the apex sustained some damage (see pic 3)
    This is how the knife looked before sharpening.
    You can click 2 X on each pic for more detail.

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    After sharpening.
    First i ground the old apex flat on the Tormek Blackstone until all damage in the apex was gone & there was a new point.
    Then i made a new edge with 15 micron diamond compound on a Paper Wheel, which was then refined with 6, 3, and 1 micron diamond compound on dedicated Paper Wheels to a full mirror.
    The new edge measures 30 degrees inclusive and is hairwhittling sharp.
    You can click 2 X on each pic for more detail.

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  2. kwackster

    kwackster Huge member

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    Dustar Model 1 Arad 67 Commemorative combat knife from a collector.
    The factory "edge" was very rough and also still had a burr so thick that i could lift the entire knife from the table by hooking it with my finger nail.
    Edge angle was +/- 45 degrees inclusive which i left intact as the customer did not want wider bevels.
    After grinding the apex flat on the Tormek Blackstone the edge was resharpened on a Paper Wheel with 15 micron diamond compound then deburred with a second Paper Wheel with 3 micron diamond compound, an the new edge can just treetop the hairs on the back of my hand.
    Probably the most wear resistant D2 steel i have sharpened so far.

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    desmodus likes this.
  3. kwackster

    kwackster Huge member

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    This vintage Al Mar Applegate Fairbairn dagger from a display collection had factory edges which were rather coarse, had a few flat spots, and a flattened point.
    Since the "R" from Rex Applegate's signature was already quite close to the +/- 50 degrees inclusive factory edge i chose not to reprofile but instead just polish the existing bevels a bit with successively 15.0 micron, 3.0 micron, and 1.0 micron diamond compound on dedicated Paper Wheels.
    Both new edges can shave the hair on the back of my hand on skin level.
    ( click each pic 2 x for a bit more detail)

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  4. kwackster

    kwackster Huge member

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    The owner of this Maxamet PM2 had given his knife a forced patina treatment, and besides coming out a bit uneven the acid had also completely eaten away the factory apex as well as the very tip of the blade.
    To say that the knife was completely blunt would have been an understatement.
    The request was to give the knife a new toothy edge with a lot of bite while making it as sharp as possible.
    (You can click each pic 2 X for a bit more detail)

    Before sharpening:

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    After sharpening
    Flattened the acid damaged "apex" some more on a 3000 grit diamond plate so i could start with fresh steel, then made a new edge on a Rubber Wheel coated with +/- 230 grit diamond powder & wax, then deburred on a Paper Wheel with 1.0 micron diamond paste & oil.
    The new edge is ever so slightly convex, the new apex fits almost exactly in the 30 degree inclusive slot of my Tormek WM200 Angle Master, plus it can whittle one of my chest hairs at about 5.5 centimeters from the point of holding. (i don't own a BESS tester)
    The somewhat "fuzzy" shoulders of the new edge show how deep the acid has eaten away into the sides of the blade in some area's.

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    desmodus likes this.
  5. wes

    wes Mephistopheles Super Moderator Brigade Member

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    This is excellent.

    Can you show your setup and the gear you use? I am looking for a new set up and this might be it.
     
  6. kwackster

    kwackster Huge member

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    Right hand Takamura R2 Gyuto 210 mm from a local Chef, who got it as a birthday present from his wife.
    The knife has already been used for two months in the commercial kitchen and it was time for it's first resharpening, which i did yesterday on a Paper Wheel with 15 micron diamond compound and then deburred on a second Paper Wheel with 0.25 micron diamond compound.
    The idea was to make an edge that would do both slicing & pushcutting well, and also to remove as little steel as possible from the fine and thin R2/SG2 blade @ 63-64 HRC.
    The new edge measures +/- 20 degrees inclusive and can whittle a chest hair from root-to-tip at about 4 centimeters from the point of holding, and after a few test cuts into a old piece of beechwood cutting board.

    I took these pics with an old Ipad and actually wanted to erase them again as being not good enough until i enlarged the last picture twice.
    At first i thought i saw small dirt spots on the new bevel, but those tiny white specks were actually the sliced off peaks of the micro-dot structure on the inside of the flimsy plastic blade protector sleeve.

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    desmodus likes this.
  7. kwackster

    kwackster Huge member

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    The owner of the Takamura R2 just sent me the link to this clip, in which he uses a grape to test the new edge:

    [video]
     
    desmodus and BennytheBlade like this.

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