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  1. #1
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    Question filing/grinding jig

    i always have the same problems with my scandi edge
    they are not strait and flat because i dont have a belt grinder.
    the only things i have are some files and a belt sander like this
    that i turn upside down. so do any of u have an idea how to make a jig
    for filing or grinding that would be a real help


  2. #2
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    Re: filing/grinding jig


    Shot at 2008-08-30

    I have shown this drawing before. It is very simple to build. Make it in wood. It works perfect, it gives you precise angles and you can with a file holder also use files.

    The black “thing” is a vice for drilling machines and costs 5-10 pounds. It holds the handle of the knife = the blade are free to be grinded in any angle you want to have.

    One thing, the blue square part works better if it have a rounded bottom.

    Thomas

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    Re: filing/grinding jig

    I have just file-ground my first bevel; it is a scandi grind (or sabre/flat grind) and managed a nice bevel with basic hand-tools and without too much fuss.

    I made a jig with a peice of 2x1 (oak) and my B&D Workmate. There are some fairly basic ratios to bevel grinding. A 28 degree grind is 14 degrees on each side. A 14 degree angle can be achieved with a 4:1 ratio on the sides of a right-angled triangle.



    My Workmate has a depth of 4.5", so I clamped the wood into it to a height of 1 1/8" to maintain the 4:1 ratio.

    I taped up the end of my file so it didn't file the wood and laying the file across the makeshift jig made a nice 14 degree angle.

    Next I needed to position the blade to make sure it was ground properly. The halfway point of the blade thickness needs to intercept the hypotenuse.



    Doing this, the angle won't be correct until you get the bevel half-way through the thickness of the blade blank because the file will be rotating down upon the steel from the fixed point at the top of the jig.

    The same ratio applies to the little triangle formed by the knife steel and the end of the jig. If you have 4mm steel, the height of this triangle is 2mm, therefore you need to set the steel 8mm back from the edge. I drew a line on the Workmate to indicate where the blade edge had to sit.



    I clamped the knife blank to the workmate with a G-clamp (and a bit of electrical tape to protect the steel) and kept altering the position of the blade so that the part I was working on had, what will become, the cutting edge lining up with my 8mm line.

    Once I took it down far enough with a file, I switched over to varying grits of wet-and-dry glued to a crisply squared peice of 1x1 sapele I had lying around.

    This is dead-simple and has given me a beautiful straight-edged bevel. There are a few minor tool-marks at the top of the bevel where I fumbled a bit with the file, but these should polish out when the final edge is put on after hardening.

    I hope this makes sense.

    Dug
    Last edited by Dug; 09-07-09 at 05:29 PM.

  4. #4
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    Re: filing/grinding jig

    in a word yes (in my head )

    i would mount the belt vertically and use a plywood platten at 90 degrees

    and emulate the set up here
    http://www.britishblades.com/forums/...ad.php?t=35912

    However i would say that with that grinder you will take a long time and use a lot of belts also you need to raise the belt to give a plunge

    I would scrine the edge center line and the grind hight and hand file between them



    or make a File jig



    i made this one out of a 100mm x 915 bench linisher but its still very slow



    heres your grind hights for angles in 3 and 4mm



    ATB

    Duncan
    www: Dorset Woodland Blades ---------------------------- Sharp is not an optional Extra ----------------------------FaceBook Page For the latest stuff


  5. #5
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    Re: filing/grinding jig

    Quote Originally Posted by EdgePal View Post

    Shot at 2008-08-30

    I have shown this drawing before. It is very simple to build. Make it in wood. It works perfect, it gives you precise angles and you can with a file holder also use files.

    The black “thing” is a vice for drilling machines and costs 5-10 pounds. It holds the handle of the knife = the blade are free to be grinded in any angle you want to have.

    One thing, the blue square part works better if it have a rounded bottom.

    Thomas
    is the angle supposed to be moved by movning the blade up and down in the vice or by sliding the green piece back and fort

    bye the way great help thanks to all

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    Re: filing/grinding jig

    The yellow block with the rod slides in the hole of the green piece. You move the yellow part up and down;
    Michiel

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    Re: filing/grinding jig

    Quote Originally Posted by mvh View Post
    The yellow block with the rod slides in the hole of the green piece. You move the yellow part up and down;
    whatt
    no i mean if u want to file another angle
    never mind

  8. #8
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    Re: filing/grinding jig

    The green part is fastening to the red part with a normal hinge.

    When you move the blue part against the red part, the green part with its loop in the end will rise higher - and the sharpening angle will increase.

    The knife is fastening in the vice and is stuck there.

    The rod is sliding thru the hole in the end of the green part.

    So, when the rod is inside the loop on the green part - you can move the blue part - and the sharpening angle will change.

    Paint your edge black with a blackboard pen. Lay down the sharpener on the black edge, adjust the blue part until the black ink disappeared from the edge (move the sharpener and study what happens). Adjust with the blue part until all black ink is gone in one stroke of the sharpener. When this is done, start the sharpening.

    If you make marks on the gray part in the corner of the blue part – you will get a sort of a “grade scale” to use next time.

    Thomas

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    Re: filing/grinding jig

    i just finished my filing jig
    it works great and doesnt wobble
    i used a bit of every design i wanted to use the vise
    but is was 43 euros so i used a less pernament solution
    it still does the job

    it is ajusteble as u can see and i am going to make another tube
    with a ring bolted in the middle
    many thanks

  10. #10
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    Re: filing/grinding jig

    excellent job


    ATB

    Duncan
    www: Dorset Woodland Blades ---------------------------- Sharp is not an optional Extra ----------------------------FaceBook Page For the latest stuff


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    Re: filing/grinding jig

    Good work
    Maybe sometime I will have go.
    Alf

    The English winter - ending in July, to recomence in august.
    George Gordon
    Scout out www.escouts.org.uk
    Knives by me

  12. #12
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    Re: filing/grinding jig

    Thank you all for sharing this valuable tips!

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    Re: filing/grinding jig

    Hi diedrich.
    Do you have a picture of how the jig was.

  14. #14
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    Re: filing/grinding jig

    This is mine, simple but effective. It has to be as i am working in the kitchen!



    Dazcon
    Hobbyist Maker And Adventurer!

  15. #15
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    Re: filing/grinding jig

    Get in touch with Fred Rowe, he is a member here. He has something called the "Bubble Jig". I have one and it is OUTSTANDING!! Moon.

 

 

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