Sharp spines and hard pressure?

Discussion in 'Edged Tools' started by 08H3, Dec 1, 2018.

?

Do you like sharp spines even when using hard thumb pressure?

  1. Yes

    33 vote(s)
    48.5%
  2. No

    31 vote(s)
    45.6%
  3. Only with gloves

    4 vote(s)
    5.9%
  1. 08H3

    08H3 God, Family and Freedom Vendor Supporter

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    Ok so I just got this little TBT 4 in today and I was thinking about it. The round on the spine would be more useable if it had a sharp shoulder to strike a ferro rod or scrape bark....

    So my poll is this, how do you feel about hard pressure with you thumb on a really sharp spine? It dont bother me but what say ya'll?

    20181201_182121.jpg
     
  2. Bob_Spr

    Bob_Spr Guide

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    Put your thumb on the spine of a Mora Eldris and thumb push cut for about 5 minutes. For most of us, our thumb would be sore for a day or so afterwards. Or have some small cuts.
     
  3. x39

    x39 Hyperborean Supporter

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    For my part, and this is purely subjective, when I'm really bearing down on something hard to cut it my thumb isn't on the spine anyway, so it doesn't matter. I think overall a rounded spine makes a blade more user friendly, such as when choking up on a blade for detail work, and also has a more finished look to it.
     
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  4. anrkst6973

    anrkst6973 Scout

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    My users have spines edgy enough for tinder or fire steel and I don't have a problem leaning down on them. I did get one new that had a bit of a burr which I took down with mere stropping. I don't think they need to be "cut you" sharp to be effective for fire prep, ect.
     
  5. Damian1690

    Damian1690 Tracker

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    I say it depends on if there is a burr and also the blade thickness. For me, I have two 1/8” knives with sharp spines and it’s not as comfy as, say, my 3/16” knives with sharp spines.
     
  6. DomC

    DomC Retired Old Scrub Stomper Supporter

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    Last edited: Dec 3, 2018
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  7. Kona9

    Kona9 Supporter Supporter

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    I want that inch closest to the handle to be rounded over with the rest of the spine ground sharp. The LTWK Jessmuk and Jessmuk C come this way as well as others. Some knife makers are known for this, R.W. Fred comes to mind (I need to get one of his stacked leather knives one day).
     
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  8. 08H3

    08H3 God, Family and Freedom Vendor Supporter

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    I've considered offering that as a option too! It's a good idea
     
  9. x39

    x39 Hyperborean Supporter

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    I roll my own strictly as a hobby. For the last 25 years I've been grinding a 15 degree angle near the point for scraping purposes with dubbed off corners closer to the handle. Obviously it has to be done right or left handed dependent on the user.

    IMG_5994.JPG
     
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  10. 08H3

    08H3 God, Family and Freedom Vendor Supporter

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    That's a great idea.
     
  11. CowboyJesus

    CowboyJesus Supporter Supporter Bushcraft Friend Bushclass I

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    i voted no....but that's because of what i've had. my first bushcraft knife-a mora, of course-has the whole spine sharpened to 90. i find myself applying a lot of thumb pressure when carving and whittling. i've noticed that when utilize a sharp spine, it's near the tip. so i'm thinking/considering doing what's been said-90 near the tip, rounded near the handle. i've done one or two like that, but need to mod some more that direction.
     
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  12. Seahunter

    Seahunter Scout Bushclass I Bushclass II

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    I cut my thumb on an opinel spine pretty bad one time. I round over the part near my hand and keep the rest square for a ferro rod.
     
  13. americanstrat98

    americanstrat98 Wanderer Supporter Bushcraft Friend

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    My carving knives have rounded spines. On my Bushcraft knives I tend to leave them sharp for shaving fatwood, bark, or a ferro rod.

    When I'm pressing really hard my whole hand encompasses the grip, but when I'm carving I put my thumb on the spine for extra control. It's not necessarily for power.

    I like a sharp spine on full flat grinds because it is essentially an 80° angle, not a 90°. I've noticed Scandi knives with flats and a 90° spine only stay sharp for so long. On my FFG I'm able to make sparks and shavings for a long time.

    I really like what @x39 is doing there. That's an ingenious way of prolonging the scraping edge on an otherwise 90° spine. Well done!
     
  14. racetrack

    racetrack Supporter Supporter

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    I wish most of my knives had this. Great approach.
     
  15. Edwin Moss

    Edwin Moss Tracker

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    I prefer sharp spines on my knives but I haven't carved extensively yet. I'm sure when I do branch out into that realm, I'll prefer rounded spines on my knives designated for carving. So far, I like a sharp spine on my knives. I recently used my Mora HD's spine to strip an axe handle of its varnish since I don't have a spokeshave on hand. I generally use the knife spine for general camp/outdoors tasks like refine handles on my makeshift mallets used for batoning.
     
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  16. PatrickKnight

    PatrickKnight Supporter Supporter

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    I generally prefer to have all edges other than the cutting edge rounded off on a knife. I keep dedicated strikers for my fire steels.
     
  17. x39

    x39 Hyperborean Supporter

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    I've started carrying a dedicated striker as well, more for safety's sake than anything else.
     
  18. 45s_Forever

    45s_Forever Supporter Supporter

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    Concur with Kona9. This is the configuration I’ve found to be the most comfortable and useful, it’s just too bad more knife makers don’t offer this as an option.
     
  19. 08H3

    08H3 God, Family and Freedom Vendor Supporter

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    I'll actually be working on some firesteel strikers that a buddy came up with an idea for with some scrap steel soon.
     
  20. charlesmc2

    charlesmc2 Scout

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    I tend to prefer using a striker for my ferro rods, but I'm coming to learn to use the sharp spine for other tasks that would dull the acute blade. Nothing like a 90° "edge" for some rough cuts. I'm thinking of the sharp spine on my two L T Wright knives.
     
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  21. buckfynn

    buckfynn Old Geezer Supporter Bushcraft Friend

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    Prefer a sharp spine, which I use primarily for tinder prep. And sharp spines have never bothered my thumbs. Nor do I use the spine to stike a ferrocerium rod. Not having a sharp spine is not necessarily a deal breaker but I still would rather have one.
     
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  22. PaPa K

    PaPa K Supporter Supporter

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    Many good points and I would like to try one that is smoothed down near the handle, but sharp on the rest of the spine. For me it comes down to blade thickness also, obviously thick blades do not bother my thumb like a thin blade might.
     
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  23. Coryphene

    Coryphene Guide

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    When you do push cutting, you only press down on one of the edges of the spine. The other side is what usually gets used for scraping ferro rods and tinder. So I don't keep both edges of my spine sharp, just one. That way I still have sharp spine edge for scraping and one rounded side for thumb assistance.

    Terava knives have a very different spine. If ground to 90*, the edges are too soft to scrape a ferro rod. So they bevel the spine. This gives a spine still capable of scraping while also being comfortable on the thumb. They accomplish this by doing a magnetic induction rapid plate tempering process to give the same effects as having a laminated steel blade (hard core, soft sides) without laminating different steels. Basically after tempering, the blade is put between 2 induction plates that near instantly heat up just the sides of the blade to soften them while not allowing the whole blade to heat up thus leaving a harder core.

    Push cutting with the thumb assist on a brand new Mora Eldris? No, thank you!
     
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  24. buckfynn

    buckfynn Old Geezer Supporter Bushcraft Friend

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    I'll be looking forward to seeing what you have in the works.
     
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  25. 08H3

    08H3 God, Family and Freedom Vendor Supporter

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    I will be using some scrap pieces to make them, once I get them tweaked I will send ya one :dblthumb:
     
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  26. buckfynn

    buckfynn Old Geezer Supporter Bushcraft Friend

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    Wow! What a deal thanks!
     
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  27. 08H3

    08H3 God, Family and Freedom Vendor Supporter

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    It'll go well with the Micro you got from me I think.
     
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  28. ArmyMacE

    ArmyMacE Husband, Father, Woodsman Supporter

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    What are you doing with a WSK? That's not really your style, you should definitely send that to me for proper disposal. :);)



    I voted yes on the spine question. Only because I do tend to do a lot of scrapping. I have cut myself twice with the spine with one of my blades. I've also had the sore thumb a few times from it, now I've changed the way I hold the blade to avoid this.

    I go back and forth... So maybe half and half on a straight spine blade, or a sharper swedge on the tip section of the blade. I've tried to mod a few knives like this, never really turned out the way I wanted.
     
  29. 08H3

    08H3 God, Family and Freedom Vendor Supporter

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    I WSK sometimes... this is from one of mine that isnt pretty but cuts.
    20181203_193247.jpg
     
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  30. Rockgod1619

    Rockgod1619 Supporter Supporter

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    ;):dblthumb::4:
     
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  31. hillst1

    hillst1 Supporter Supporter

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    @x39 Nice job with the striking edge. What knife did you do it on?
     
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  32. Gecco304

    Gecco304 Scout

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    Let's see that WSK!
     
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  33. anrkst6973

    anrkst6973 Scout

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    image.jpeg image.jpeg

    This is the one I stropped the sharp burr off of. It's still square and edged enough to do shavings from a magnesium block or make an eye searing shower of sparks from the ferro side. As time passes if it needs a touch up I use a fine file and a very light touch to bring it back.
    I have pretty ornery hide so what I think is fine might be harsh for someone else, it's a ymmv moment for sure. :)
     
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  34. Kyle363

    Kyle363 Supporter Supporter

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    All my knives have sharpened spines and while not the most comfortable for long carving sessions I'd rater have a sharpened spine for the usefulness of it. I've done at least a 1 hour carving session and my thumb was sore the next day but not as sore as its been in the past. I figure eventually the sharp spine won't bother me at all. One last thing, a sharp thin spine like those on 3/32 blades hurt more over time than say a 5/32 thick spine.
     
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  35. 08H3

    08H3 God, Family and Freedom Vendor Supporter

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    Go look in the Vendor classifieds, I listed the blank today. Cant post pics of it here sorry.
     
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  36. x39

    x39 Hyperborean Supporter

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    Thanks! I do that on all the knives I make. Just so I don't run afoul of forum rules, I want to be clear in that I make knives for the pure enjoyment of it and have no interest whatsoever in doing it as a commercial venture (hence the obscured stamp). That said, the knife below is the one in the picture. 5/32" A-2 with Micarta handle, 3 7/8" blade.

    IMG_5997.JPG
     
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  37. 08H3

    08H3 God, Family and Freedom Vendor Supporter

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    I really like this idea, may have to try a version like that on a knife sometime.... maybe mod a existing blade
     
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  38. x39

    x39 Hyperborean Supporter

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    I've found it works really well, hope the idea is of help to you.
     
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  39. 08H3

    08H3 God, Family and Freedom Vendor Supporter

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    Oh it will, thanks.

    I'm guessing, from the pictures of that knife that the grind on the right side of the blade is intended to be used by the left hand to scrape when the knife is held upside down?
     
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  40. PVF1

    PVF1 Supporter Supporter

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    Bingo. This is the way to go. Unless there's jimping on that spot, there's no reason why you can't round or at least chamfer the spine down near the handle. It's an easy mod, sacrifices almost nothing in terms of functionality, and makes a huge difference in comfort.
     
  41. x39

    x39 Hyperborean Supporter

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    No, actually it's intended to be used right handed. Holding the knife with the cutting edge up, the angle is actually relief for the edge. When I first conceived the idea I was putting the grind on the other side, but found this works better. Crude sketch below...

    IMG_5998.JPG
     
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  42. J. Pierce

    J. Pierce Perpetually Off Topic, Sorry. Supporter

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    I never gave sharp spines much thought, but my hands are calloused and rough as a cob. All day I smash, cut and bang them on way nastier stuff than any knife spine ever made. So I may or may not be a good indicator of the masses, but one of those yes votes is me.
     
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  43. 08H3

    08H3 God, Family and Freedom Vendor Supporter

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    :dblthumb: ah ha!
     
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  44. 08H3

    08H3 God, Family and Freedom Vendor Supporter

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    Kinda surprised how close this is running actually....
     
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  45. x39

    x39 Hyperborean Supporter

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    Are you referring to the grind breaking the edge? If so yes, you have to be extremely careful to not to go too far. It's very easy to mess up and ruin the lines of the blade. Just dawned on me you're talking about the poll, never mind.... :22:
     
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  46. charlesmc2

    charlesmc2 Scout

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    Several others have expressed similar. When I was a lad, growing up in a farming community, the men had rough, tough hands. As I grew up and worked outside, my hands began to toughen. No more. Mine are not the softest around, but they are far from what I knew as working man's hands. (That was pretty much a redundancy, the men I knew WORKED.) I try to rebuild some of that toughness, but with limited success. Few men I know have those tough hands I remember.
     
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