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The "Ask Nathan a question" thread

Discussion in 'Carothers Performance Knives' started by JustinFournier, Aug 30, 2016.

  1. Ratman79

    Ratman79

    Jan 5, 2016
    The medium chopper def. sounds like something I could use!
     
    Standard78 likes this.
  2. Benson X

    Benson X Gold Member Gold Member

    733
    Mar 1, 2016
    Please do!

    And then sell me one (or two)! :D
     
  3. duramax

    duramax KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Nov 29, 2012
    " Nathan "

    I saw the mention of the HDFK in D2. Just curious about how A2 steel would be in that design ? Just curious , seems the more I hang out here the more I want to know about steel differences and use.
    Thanks :)
     
  4. Nathan the Machinist

    Nathan the Machinist KnifeMaker / Machinist / Evil Genius Moderator Knifemaker / Craftsman / Service Provider

    Feb 13, 2007
    A2 would do very well in that design (it's an ideal application for that alloy), but it would be redundant. I like A2, but optimized 3V has similar edge stability and edge retention and greater toughness and stain resistance. There is too much overlap in their properties to do both, and D3V is probably better in every meaningful way for the application.
     
  5. duramax

    duramax KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Nov 29, 2012
    Thank you, I thought A2 was pretty good stuff :thumbsup: Thought it might be easier to machine making it more cost friendly. But with your explanation on D3v and all that's been said about D3v. Well it makes sense that with your D3v that it would come out on top. The D3v is great stuff :) :)
    Thanks
     
  6. LukeTheSpook

    LukeTheSpook

    Jan 2, 2015
    I'm curious, and I hope this hasn't been mentioned before. You say the new knife in optimized d2 is actually PSF27? Are the optimized d2 edc's PSF27 as well?


    It seems that steel is gaining some real popularity. I have a slicer from big Chris in that steel and its unreal in performance.
     
    Last edited: Aug 17, 2017
  7. Jo the Machinist

    Jo the Machinist KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Nov 17, 2015
    The D2 EDCs are not PSF27.
     
  8. Nathan the Machinist

    Nathan the Machinist KnifeMaker / Machinist / Evil Genius Moderator Knifemaker / Craftsman / Service Provider

    Feb 13, 2007

    The EDCs are conventional melt Crucible D2. IMO this is a better steel with better edge retention and particular cutting characteristics in soft abrasive materials like hide that makes it ideal in something like a skinning knife etc. But it lacks the toughness required for a large knife intended for rough use like the HDFK. I wanted to try a D2 for this pattern but CPM D2 doesn't perform for me, so we tried PSF27 for a nice "middle of the road" alternative.


    With D2, the heat treat is very critical and it deviates from the industry standard HT developed for tooling considerably. Most people who have used D2 in a knife haven't seen what it is actually capable of, it is truly a high performance material. It isn't stainless and it doesn't have great toughness nor fine edge stability so it doesn't always test as well as super steels in particular testing that looks at joules of energy absorbed in a fracture impact test, catra knife abrasive media testing, and rough use demonstrations in things like nails etc. But, with an optimized heat treat that addresses some of the underlying fine edge stability issues it is both tougher and has better real wold edge retention than most super steels in real world use and will run circles around most materials that most people have experience with, when used normally as a knife. Despite not being particularly popular, nor commonly done "right" it has enormous real world performance potential in a working knife and is one of my favorite materials. PSF27 is a modern variation of D2 that has the toughness needed for a heavy duty field knife, we're trying it out in some Heavy Duty Field Knife prototypes with the goal of achieving some of that D2 goodness in a big knife.
     
    Last edited: Aug 17, 2017
    gusbuster likes this.
  9. betzner

    betzner CenCal Coast Platinum Member

    Jan 23, 2007
    ^^^ I love it when he talks dirty about edge stability!

    [​IMG]

    [​IMG]
     
  10. ManOfSteel89

    ManOfSteel89

    May 20, 2012
    I may be a lowly welder but I can say this, I use the HELL out of my knives and this EDC in D2 just keeps going. It loses its shaving sharpness after a little bit (like anything will) but it keeps what I call a working edge for a long, long time. I end up running it on a strop about once a week but it'll cut and cut and cut for quite a while even when it doesn't have that "sticky" sharp feeling that grabs your finger and doesn't shave arm hair.
     
    Brian77, Hard Knocks and gusbuster like this.
  11. TRfromMT

    TRfromMT Gold Member Gold Member

    Jan 4, 2016
    I wonder if that bad mother*^(k3r prototype could be reground as a recurve to work out those 'little edge/microchips' back to a working blade. I know it is a historical piece as much as anything and I know you value it as such, Bob. Just wondering out loud (random thought?). My brain is always 'tinkering' and wondering if it could be modified. Not a serious question.
     
    Brian77 and ManOfSteel89 like this.
  12. JustinFournier

    JustinFournier Gold Member Gold Member

    May 7, 2012
    Blasphemy.
     
    Brian77 and TRfromMT like this.
  13. JustinFournier

    JustinFournier Gold Member Gold Member

    May 7, 2012
    That HC sure dwarfs the HDFK. Have a shot with the BC, HC and LC along side the HDFK?
     
  14. betzner

    betzner CenCal Coast Platinum Member

    Jan 23, 2007
    I should put a shot together of them all, which I haven't done yet. Hell, I can't even find the above pic in my computer or fototime album since I synched it to google, lol. But I'll put one together tomorrow.

    Edit: at least I found the above 2-knife pic finally
     
    Last edited: Aug 18, 2017
  15. betzner

    betzner CenCal Coast Platinum Member

    Jan 23, 2007
    Justin, as you requested, top to bottom, then right to left - the BC, HC, RLC with Westinghouse, LC, Shiv in A2, Shiv in 3v, the "rainbow" and the UF:

    [​IMG]

    [​IMG]
     
  16. High Standard

    High Standard Gold Member Gold Member

    315
    Mar 23, 2017
    Betzber,
    That's a great set of knives.
    What handle material is on the UF ? Wood ?, If so, what type.
     
    betzner likes this.
  17. ManOfSteel89

    ManOfSteel89

    May 20, 2012
    @betzner that NASK really just does it for me. And the BC will be King in my book for a long while I think. Thanks for the comparison shot.
     
    betzner likes this.
  18. TommyGun56

    TommyGun56 Gold Member Gold Member

    Jul 29, 2014
    Yup, I am liking the HDFK more and more-Thanks for the Pics:D:thumbsup:
     
    betzner likes this.
  19. JustinFournier

    JustinFournier Gold Member Gold Member

    May 7, 2012
    Wow Bob, that pic really puts the BC into perspective. And the HDFK comes out looking just awesome in size. I can't see how that isn't going to be massively popular.

    Thanks for takin' the time to take that pic and sharing.
     
    Last edited: Aug 18, 2017
    betzner likes this.
  20. betzner

    betzner CenCal Coast Platinum Member

    Jan 23, 2007
    Cocobolo, a rosewood.
     

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