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  1. 12th August 2007, 10:58 PM #1
    Groggy's Avatar
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    Default An Oire Nomi WIP: Part III - Chisel number one, flattening the back

    Well, this is going to take some time. I started by having a quick go at the largest chisel and discovered there is a lot more to these than meets the eye.

    Pic one shows the results of two hours of flattening. I had a go, wasn't happy and came back inside to read So's how-to on uraoshi technique, then had another go.

    If you look at the picture, you can see the corners are not yet flattened. I know why, after thinking it through I realised there was less surface area at the heel of the blade so I was wearing the back and slowly causing the cutting edge to raise. What I needed was something to stop the heel from wearing.



    In the pic above you can see the hoop resting on a support to keep the angle I need.
    This seemed to work fairly well and, when I applied all the weight on the bevel it started to correct the error.
    This pic of the ura is the most recent, after I have worked out most of the mess I caused .

    Lesson #1: Apply no weight at the back of the blade.


    The second picture I thought may be useful for those who wondered what motion was used to sharpen. If you look at the swirl pattern it should be evident that a tight ellipse is used, travelling from right to left.
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  3. 12th August 2007, 11:05 PM #2
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    Quote Originally Posted by Groggy View Post
    ...the results of two hours of flattening. .....
    Still beats an hour of weeding.
    Cliff.
    If you find a post of mine that is missing a pic that you'd like to see, let me know & I'll see if I can find a copy.
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  4. 12th August 2007, 11:07 PM #3
    ozwinner
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    Oh Groggysan, when I need mine sharpening, Ill send them to you.

    Alsan
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  5. 12th August 2007, 11:13 PM #4
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    Quote Originally Posted by ozwinner View Post
    Oh Groggysan, when I need mine sharpening, Ill send them to you.

    Alsan
    You may want to wait a while for that . I went backwards pretty fast with the first one. You really need to watch you don't put weight on the heel of the blade.

    Quote Originally Posted by Cliff Rogers View Post
    Still beats an hour of weeding.
    Absolutely, I found it very therapeutic. Wax on, wax off....
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  6. 13th August 2007, 12:35 PM #5
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    Hi Groggy,

    Sounds like you were right when you said that this is going to take some time. With ten chisels to sharpen, thats a lot of therapy time.

    Have some to do also, including a little male dovetail from So. So will be watching with interest, before I start my therapy.

    Thanks for posting.

    Cheers
    Pops
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  7. 20th August 2007, 07:36 PM #6
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    Had another hour of "therapy" tonight. I have the back of the biggest chisel reasonably flat to within a few thou. Using an 8000 king I have a mirror finish but can see some slight variations, particularly near the corners of the chisel. This is the hardest area to get even I've discovered.

    I find my technique is changing from the usual wave speed to a slower and much more deliberate stroke. The angle of attack is changing from longitudinal to lateral wipes, holding the blade dead even. In fact, I find I need to apply more weight to the leading edge and just hold the training edge as it passes over the stones.

    No pics tonight, maybe next time.
    Last edited by Groggy; 24th August 2007 at 11:00 PM.
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