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Thread: My sharpening tool

  1. #11

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    Very slick. I would never be able to come up with an idea like this, let alone build one of these, but a friend of mine suggests that some thumbscrews might be handier, to replace the wrenches.

  2. #12
    Senior Member Crothcipt's Avatar
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    Sir I am a noob when It comes to sharpening. But my 2 cents says that I like it. I am not sure about how the tip is taking enough or to much off. Other than that I can't see anything wrong.

    Btw Welcome to the forum.

  3. #13
    nice job! and thanks for the video

    cheers!
    once in a while you get shown the light, in the strangest of places if you look at it right

  4. #14

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    A+ for creativity.

    It looks like once you set up you device sharpening will come out just about right. My only concern would be safety, In video shows blade and device are not so easy to attach with each other and many moving parts, other than that GREAT job.

    Boki

  5. #15
    Senior Member Justin0505's Avatar
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    Very, very cool. Thanks for the video and sharing your project.
    This system is doing the same basic thing as the edge pro system, except it's kinda flipped upside down (or is it right-side up?) and is moving the knife and not the stone. However, it does have a few big advantages: such as the ability to use any stone (although you will still need to make adjustments for each stone of different thickness) and the fact that the arm is much longer so the arc that it moves in has a much larger radius and becomes less of a factor.

    You've obviously put some thought into it, so these suggestions are just because thinking about design and engineering is fun and are by by no means criticism:

    - a way to lock/ immobilize each of the pivots and hinges (this would make adjustments and clamping the blade much easier).

    - the spring idea to reduce the effective weight of the arm is a good one, but I think that a tension spring which pulls the arm up might work better than a compression spring under the arm. It would be easier to calibrate / adjust on the fly and would be more tolerant of the way that the arm swings. You could extend a post up from just behind the pivot to anchor the spring and then stretch it down and attach it to the non-extending (underside) of the arm.

    - adding shims or some of height adjustable platform under the stones would allow you to compensate for different thicknesses without adjusting the entire arm.

    - adding rubber / padding to the clamping jaws would be easier than trying to wrap a loose pad around the knife.

    - some way to mark reference points on the angle and height adjustment.

    - if you wanted to completely negate the issue of the arm radius all together, you could add another horizontal pivot just behind the free-spinning bearing on the blade clamp. That would add another degree of freedom and would allow you to pivot counter to the direction of the main arm pivot. Thus, cancelling it out and allowing you to keep the vector of the motion of the knife the same as you sharpen the different sections of the blade.


    Oh yeah: nice knife by the way! If a dammy Kramer is your "test knife", I'd love to see the rest of your collection.

  6. #16
    Pabloz's Avatar
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    Quote Originally Posted by Crothcipt View Post
    Sir I am a noob when It comes to sharpening.
    LIAR!!!!



    That being said, it looks like it will solve the sharpening dilema for someone....prolly me!

  7. #17
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    Quote Originally Posted by Justin0505 View Post
    ...- if you wanted to completely negate the issue of the arm radius all together, you could add another horizontal pivot just behind the free-spinning bearing on the blade clamp. That would add another degree of freedom and would allow you to pivot counter to the direction of the main arm pivot. Thus, cancelling it out and allowing you to keep the vector of the motion of the knife the same as you sharpen the different sections of the blade...
    Yes. However, with the extra degree of freedom, you would introduce a need for a little more skill and probably defeat the purpose. You'd need to be able to "program" the curvature of the blade into the device or perhaps you can simply position the blade so the less acute angle is at the heel for tough chopping jobs and the more acute angle ends up at the tip and call it good...

  8. #18
    Pabloz's Avatar
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    Quote Originally Posted by tk59 View Post
    position the blade so the less acute angle is at the heel for tough chopping jobs and the more acute angle ends up at the tip and call it good...
    WHOA...that is a golden nugget to a dummer like me. Makes perfect sense.

    THANK YOU for that one Tinh!!!!

  9. #19
    thnx all!

    @ justin,

    I like your suggestions. I had the idea about the rubber, but didn't had any usable rubber layin around ;-)
    What is your idea about the post with the tension spring?

    The extra pivot point is a nice idea. I also figured that the bigger the radius (arm length) the easier the sharpening. An extra pivot would able you to turn the knife a little when sharpening the tip for example. But I don't think that is a big advatage. And like tk59 said, it might overrun the purpose a little...

    The knife is made by me. I made it to get a feeling for kramers knives. I've got my own design ready now (primarily focusing on the right convexes right now ;-)

  10. #20
    Dutch ingenuity!

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