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Jig For Ulu

Discussion in 'Jigs & Holders' started by John Noon, Mar 14, 2019.

  1. John Noon

    John Noon Well-Known Member

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    Belt Grinder - Blade Holder

    Making an ULU that has no straight edges and tricky to keep knuckles away from the grinders belt gets interesting. Plan on making several knives and decided time for a rebuild on the grinder.

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    Old set-up only a flat platen
    with recycled stainless work rest.

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    Contact Wheel mounted with an adapter from 3/4" bolt


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    Small Wheel Attachment
    Shape of knife I will be grinding


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    Basic concept worked out


    In order to get full range of the joint I had to taper the nuts used for centering the holder.

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  2. dancom

    dancom Dust Maker Best Shop Tool

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    That's pretty smart using a ball joint like that. Great idea.

    @Kevin Cox showed me a longer arm version something like this once that he uses for setting the cutting edge on his blades.
     
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  3. John Noon

    John Noon Well-Known Member

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    Decided to add another holder on the arm for grinding straight edges for both the flat platen and contact wheel.

    Using a early 1900’s patent for inspiration and the back of blade will run on the outer race of a bearing.
    The ulu jig appears to offer the freedom of hand grinding with stability of a jig. Will know for sure once I start grinding steel.
     
  4. ToddR

    ToddR Putterer, Tinkerer, Waster of Time Staff Member

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    very very cool JOhn
     
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  5. cuatroXcuatro

    cuatroXcuatro Active Member

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    Great idea. Do you have a model # or size for that heim joint?
     
  6. John Noon

    John Noon Well-Known Member

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    From princess auto 1/2” but 3/8” will work just was well
     
  7. John Noon

    John Noon Well-Known Member

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    A few have asked for more pictures, the order may a bit random but I had a hard time remembering all the configurations I used :whistling

    the straight blade with curved edge is a ice auger blade. They have to be angles and offset so that when sharpening or grinding you get a matching sweep.

    Round knife Jig

    Had to make repairs on a very old leather knife plus make one for myself. A whole bunch of pictures for the random stuff I had and how it works.

    Feel free to share with other knife makers.
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  8. ToddR

    ToddR Putterer, Tinkerer, Waster of Time Staff Member

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    Pretty cool rig John.
     
  9. ToddR

    ToddR Putterer, Tinkerer, Waster of Time Staff Member

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    PS - why kind of grinder is that? Looks fairly customized.
     
  10. John Noon

    John Noon Well-Known Member

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    The grinder is old and not common plus parts are very pricey.

    I got it used with no tool rest or anything so I have been building as needed.

    Next tool will be a 12” sanding disk and work rest. Will be attaching a spare wheel to back of disk and drive with a old belt
     

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