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TOPIC: Securing the knife in the clamp

Securing the knife in the clamp 5 months 4 weeks ago #16625

  • leomitch
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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.
Never go anywhere without your knife!
Gibbs rule number 9

Leo James Mitchell
Last Edit: 5 months 4 weeks ago by leomitch.
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Securing the knife in the clamp 5 months 4 weeks ago #16630

  • mark76
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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.
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Securing the knife in the clamp 5 months 4 weeks ago #16634

  • Mikedoh
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Some use a piece of leather from an old glove.
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Re:Securing the knife in the clamp 4 months 5 days ago #17392

  • jimbowfnx
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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.


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Re:Securing the knife in the clamp 4 months 5 days ago #17393

  • Mikedoh
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Have you tried the upper holes?
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Re:Securing the knife in the clamp 4 months 5 days ago #17394

  • Geocyclist
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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.)
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Re:Securing the knife in the clamp 4 months 5 days ago #17396

  • tcmeyer
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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.
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Re:Securing the knife in the clamp 4 months 5 days ago #17399

  • razoredgeknives
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jimbowfnx wrote:
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.


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you guys are all doing it wrong :P

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.
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Re:Securing the knife in the clamp 4 months 5 days ago #17400

  • cbwx34
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Re:Securing the knife in the clamp 4 months 4 days ago #17402

  • razoredgeknives
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cbwx34 wrote:
exactly! Thanks curtis! i totally missed that post a while back... =)
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