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Thread: Rounding the spine...

  1. #1

    Zwiefel's Avatar
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    Rounding the spine...

    I recently purchased a Zakuri from the BST here and got a chance to look it over last night. This afternoon I decided to see if I could round the spine a bit, it's a bit sharp as I received it.

    The only tool I had handy to do the work was 400 grit wet/dry sandpaper....but I didn't have a vise to hold the knife steady....but I guess the sandpaper could be held steady just as well:



    I inverted the petty and moved the spine back-n-forth while adjusting the angle from about 40* to about 90* and repeated for the other side of the spine. It was surprisingly similar to the motion for sharpening...need to mind the edge a bit more though Certainly not the most sophisticated rounding I've seen...but it made a pretty big difference in the ergonomics. Was pretty pleased with my results considering this is the first time I've tried to use sandpaper for anything with a knife.

    Also decided to try to get rid of some scratches from sloppy work thinning behind the edge on a gengetsu. Still more work to be done, but I need a higher grit sandpaper to finish it, i think. Before and after:


    Certainly not the most sophisticated repair work I've seen on here...but I'm pleased with it for a first attempt. Need to find some 2k grid sandpaper now...and something better than a couple of chopsticks for a backer!

    Sharpened the Zakuri and Gengetsu as well. Was able to raise a burr on both sides, with the 1k and 5k in no time. Both are cutting well. Aside from food, I also like to cut paper all along the edge to get a sense of the performance throughout. I have a lot of trouble doing that with the heel as I've not been able to cut with a push motion, only a pull motion. Today I had the idea to hold the knife by the spine with the handle away from me, like this:


    That allowed me to make a pull-cut from the middle of the edge all the way to the heel. Has anyone else tried this technique?
    Remember: You're a unique individual...just like everybody else.

  2. #2

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    Which type of sandpaper is that? I use SiC wet&dry sandpapers (120 - 2000 grit) for rounding, polishing and sometime sharpening.

  3. #3

    Zwiefel's Avatar
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    Quote Originally Posted by bluntcut View Post
    Which type of sandpaper is that? I use SiC wet&dry sandpapers (120 - 2000 grit) for rounding, polishing and sometime sharpening.
    I can't find the exact product online...but it was "3M Auto Wetordry" 400, 800, and 1000 grit, I think it's in 9X9 sheets, pack of 5 (for each grit). About $8 for each pack. I don't know anything about selecting sandpaper, I just picked something labeled "wet/dry" that had a good range of grits.
    Remember: You're a unique individual...just like everybody else.

  4. #4

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    Well, mine SiC w&d are quite black in color. I asked because from your pic, the sandpaper looks dark-orange-ish as if it was a garnet sandpaper.

    Edit: Garnet has low Mohs (hardness), which mostly use for soft material wood/paint/etc...

  5. #5

    Zwiefel's Avatar
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    Quote Originally Posted by bluntcut View Post
    Well, mine SiC w&d are quite black in color. I asked because from your pic, the sandpaper looks dark-orange-ish as if it was a garnet sandpaper.
    gotcha...I think it's just the lighting...there is a very warm incandescent lamp directly above that part of the counter. I'm red-green color-blind, but it seems like a pretty dark charcoal color to me in person. The photo does look a bit orangy though.
    Remember: You're a unique individual...just like everybody else.

  6. #6
    Glad you got your hands dirty!

    That sandpaper pic fooled me too, but I see it now.

  7. #7
    Thanks for posting. I'm hardly on the 'Pro Craftsman' level, so am happy to read. Recently received a 3M wet/dry set to play with polishing, but am only somewhat pleased with the results. There must me more to learn, I guess...

  8. #8

    Zwiefel's Avatar
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    Quote Originally Posted by Cutty Sharp View Post
    Thanks for posting. I'm hardly on the 'Pro Craftsman' level, so am happy to read. Recently received a 3M wet/dry set to play with polishing, but am only somewhat pleased with the results. There must me more to learn, I guess...
    I get fairly intimidated with the average quality of the craftwork on here, wanted to share a noob experience

    I'm pleased with my result...but not satisfied. Def could be done better...but that's for next time...at least I don't feel like it's an eyesore anymore. Honestly, i was really embarrassed to show anyone the before state...but Eamon was kind and encouraging

    OTOH, if anyone wants to compare .BAT scripts, that's something I have 20 years of experience with!
    Remember: You're a unique individual...just like everybody else.

  9. #9
    Hey we all start somewhere and I'm happy to see your input here.

  10. #10
    Senior Member brainsausage's Avatar
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    This is inspiring for sure Zweifel. I've been playing around with learning some of these very same things, as well as getting into doing my own re-handling. Nice work

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