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Securing the knife in the clamp

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Viewing 15 posts - 1 through 15 (of 45 total)
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  • #17804
    Leo James Mitchell
    Participant
    • Topics: 64
    • Replies: 687

    Once you have decided where to place the knife using the ruler and the depth gauge, tighten the screws in this manner: the top screw is really to move the jaws of the clamp, so just snug the screw down to firmly hold the knife in place, but do not over tighten. CAUTION: Over-tightening this top screw may bend the clamp so it will not hold the knife as securely as it should.
    The bottom screw is the one that securely holds the knife in place so it will not move while you are using the paddles. Tighten this one until the knife is rigidly held in the vise.
    Remember to write down any placement figures or other mounting instructions in a record book so you can repeat the placement accurately the next time you sharpen the knife or simply want to refresh the edge.

    #17809
    Mark76
    Participant
    • Topics: 179
    • Replies: 2760

    And if you have a fully flat ground knife, you can clamp it upright by using a piece of chamois. Some people use foam tape and that works well, too.

    Molecule Polishing: my blog about sharpening with the Wicked Edge

    #17813
    Mikedoh
    Moderator
    • Topics: 38
    • Replies: 563

    Some use a piece of leather from an old glove.

    #18666
    jim
    Participant
    • Topics: 5
    • Replies: 19

    I’m trying to do a paramilitary 2 and no matter what I use to clamp the knife. I keep hitting the clamp on the right side. Can’t even come close to 15 degrees per side. Or 16. What gives? Very frustrating.

    Sent from my iPhone using Tapatalk

    #18667
    Mikedoh
    Moderator
    • Topics: 38
    • Replies: 563

    Have you tried the upper holes?

    #18668
    Geocyclist
    Participant
    • Topics: 25
    • Replies: 524

    I have the same problem. I check the blade with the angle cube to get both sides equal.

    I use mole skin in the vice, but “shim” one side with painters tape. Most of the time 5 layers of tape on one side fixes the problem. Once I had to use 15 layers of tape. (had I had know I would have used something thicker on that knife.)

    #18670
    tcmeyer
    Participant
    • Topics: 37
    • Replies: 1928

    Every time I attempt to clamp a full-flat-ground blade using a compressible media, I end up with a slightly different vertical angle. So I have had to rely on using angle-cube readings off the blade sides to estimate the actual vertical axis.

    If I’m going to have to check it every time anyway, I decided to clamp the blades flat against the left jaw. I use a paper towel patch (Scot’s blue shop towels) as a pad to protect the blade’s finish. I kick the bottom of the right jaw out at an angle so that it falls flat against the right face of the blade. Pinch the jaws together against the blade sides at the top edge of the jaws. Snug the top screw only to take up the slack. Then tighten up the lower screw as you would normally. After measuring the angles of the sides, you add them together to find the total primary included angle – divide it by two to find the net vertical axis. Since the blade is leaning to the left, you subtract the net vertical axis angle from the left angle setting and you add it to the right angle setting. Now you can sharpen as you would normally.

    The above procedure will give you an optimum clamping interface at the blade/jaw connection. No left/right rocking. No vertical movement. And repeatbility.

    #18673
    Josh
    Participant
    • Topics: 89
    • Replies: 1671

    I’m trying to do a paramilitary 2 and no matter what I use to clamp the knife. I keep hitting the clamp on the right side. Can’t even come close to 15 degrees per side. Or 16. What gives? Very frustrating.

    Sent from my iPhone using Tapatalk

    you guys are all doing it wrong 😛

    the easiest way (with no tape or anything) to get a consistent, quick bevel is this: place your blade in the vise ALL THE WAY FORWARD to where you at least have some of the flat part of your blade (near the handle) in the vise. Then all you have to do is tilt your knife’s tip downward about 30 degrees (I put the stone up to the blade and keep tilting it until my stone is perpendicular to the edge through the entire curve of the edge). This will yield a perfectly even, repeatable edge. Remember, the “finding the sweet spot” tutorial is just a beginning point and a guide for new guys – it’s not the end all be all when it comes to potitioning. You have to be willing to think outside the box on some blade shapes and grinds.

    Hope this helps… let me know if you have any questions and i’ll try to get a pic/video.

    #18674
    cbwx34
    Participant
    • Topics: 57
    • Replies: 1505
    #18676
    Josh
    Participant
    • Topics: 89
    • Replies: 1671
    #18683
    Mikedoh
    Moderator
    • Topics: 38
    • Replies: 563

    Razoredgknives wrote ” (I put the stone up to the blade and keep tilting it until my stone is perpendicular to the edge through the entire curve of the edge.”

    A picture of this would help clarify things for me.

    Thanks

    #18684
    Josh
    Participant
    • Topics: 89
    • Replies: 1671

    Razoredgknives wrote ” (I put the stone up to the blade and keep tilting it until my stone is perpendicular to the edge through the entire curve of the edge.”

    A picture of this would help clarify things for me.

    Thanks

    Curtis posted a link to the thread a bit back… this is what his pic looked like

    #18687
    Mikedoh
    Moderator
    • Topics: 38
    • Replies: 563

    Thanks, Josh. I remember that thread and did look it over again. I was confused about the stone being perpendicular to the edge. I was visualizing stone placement something akin to destressing the edge, cutting directly into the stone. Couldn’t understand how that was to be accomplished.

    Got it now.
    Thanks

    #18689
    Josh
    Participant
    • Topics: 89
    • Replies: 1671

    When I say perpendicular in this case it is on a different “axis” if you will… I am not meaning that you actually take your stones off of the rods and put it purpendicular into your edge. I am meaning that you leave it on the rod and then, wherever you move it you will want the edge to be as close to “parallel” with the top (short side of the rectangle of the stone). see attached pic… does it clear it up?

    Attachments:
    #18690
    Mikedoh
    Moderator
    • Topics: 38
    • Replies: 563

    Thanks, I got it now.

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