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The "Ask Nathan a question" thread

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

  1. azwelke

    azwelke azwelke.com Knifemaker / Craftsman / Service Provider

    Nov 12, 2007
    Tell them you want hush money :D
     
    vkp78, Standard78, WValtakis and 4 others like this.
  2. Casinostocks

    Casinostocks Factotum Platinum Member

    Mar 20, 2016
    Hi Nathan, I've been thinking about sending out a UF in D3V to Josh for a DLC process (or Cerakote as an alternative) and was wondering about potential harm to the steel with regards to the HT and temper. TIA.
     
  3. PeteyTwoPointOne

    PeteyTwoPointOne Platinum Member Platinum Member

    Jun 10, 2014
    Good afternoon NtM...I read your post #2741 about m390, ht, et.al. ... it was very informative, thanks.

    Sounds like AEB-L <with CPK optimized anneal/HT/quench protocol ;)> is getting close to the holy grail of "stainless properties with tool steel performance & sharpen-ablility..."

    I know there was the limited aeb-l UF recently.... but what can we expect out of CPK offerings in AEB-L in the future? Something small & slicey and widely available I hope... Thanks
     
    CataD, gusbuster, untytled and 3 others like this.
  4. gusbuster

    gusbuster Gold Member Gold Member

    Aug 30, 2011
    Nathan what do think about 20CV? I read somewhere that it is similar to M390.
     
    Odog27 likes this.
  5. Nathan the Machinist

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

    Feb 13, 2007
    It's ok. Not great.
     
    gusbuster and Odog27 like this.
  6. CataD

    CataD Platinum Member Platinum Member

    Oct 2, 2013
    Fullflat, gusbuster and Odog27 like this.
  7. Nathan the Machinist

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

    Feb 13, 2007
    "The Shiro I'm carrying uses M390. I think I had it in a Reate I lost too. It's not great. No better than the S30V in the Sebby I was carrying before that, and that didn't set a very high bar.

    I have experimented with the alloy here and have done heat treat trials with it. I don't really like it. It's not bad, but it's not great. I suppose the abrasion resistance is very good as is the corrosion resistance, but it doesn't stay very sharp in real use as well as alternatives such as Elmax. I think there's just too much alloy and carbide for the matrix to properly support a knife edge. Mushy crumbly when I've used it.

    I think one reason folks have mixed results with it is because, in my experiments, it was unusually sensitive to quench rate. The Rockwell hardness numbers they show in the data sheet are what I've seen in atmosphere quenches but my testing of the alloy here I got significantly higher numbers with faster quenches. This degree of sensitivity and the variation you will get from one setup to another and from one geometry to another means that the optimized heat treat for it may be illusive and inconsistent. Most volume makers waterjet, heat treat, then grind. That solid cutting edge area was thick during the quench, and it was a nitrogen gas quench in the oven which isn't real fast to start with, so I don't think they're always getting the quench rate that alloy needs. Not ideal for the alloy and would explain why it doesn't perform great in the factory knives I've used.

    So, to me, I think it's probably an outstanding material for it's intended uses, but for cutlery I've seen better real world performance out of regular S35VN. People put too much credence in those card stock cut tests and perhaps knives with obtuse edges or subject to light use. I played with it and didn't get the edge stability I want and haven't messed with it again. "
     
    Fullflat, Mike157, azwelke and 10 others like this.
  8. Jo the Machinist

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

    Nov 17, 2015
    tldr :D
     
  9. woodysone

    woodysone Gold Member Gold Member

    Nov 21, 2005
    tldr?
     
  10. Jo the Machinist

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

    Nov 17, 2015
    Too long didn’t read. :D:D:D
     
    Fullflat, mpjustin, vkp78 and 9 others like this.
  11. woodysone

    woodysone Gold Member Gold Member

    Nov 21, 2005
    :rolleyes::)
     
    Fullflat, Mike157, gusbuster and 3 others like this.
  12. JJ_Colt45

    JJ_Colt45 Gold Member Gold Member

    Sep 11, 2014
    I read and actually understood all of this one ... so did I get bitten by a radioactive spider and am now smart? ... or was that just Nathan dumbing it down so I could follow? ...

    I'm either amazed @ me ... but probably more likely should just nod and thank Nathan ...

    from my past ... I'll go with the second choice :p
     
    Fullflat, vkp78, Mike157 and 4 others like this.
  13. folder geek

    folder geek Gold Member Gold Member

    681
    Jan 28, 2012
    Great read and info:thumbsup:
    Thank you Nathen!
    Cheers
     
    Mike157, gusbuster and Odog27 like this.
  14. jlauffer

    jlauffer Gold Member Gold Member

    Apr 11, 2016
    You must've stayed at a Holiday Inn Express!
     
    Fullflat, Odog27, Mike157 and 4 others like this.
  15. Casinostocks

    Casinostocks Factotum Platinum Member

    Mar 20, 2016
    Nathan, do you also buy any knife or knives for self when at Blade? Are there any tables/makers whom you look forward to frequenting if you get spare time?
     
    Fullflat, Hard Knocks, Odog27 and 2 others like this.
  16. Jo the Machinist

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

    Nov 17, 2015
    We are on the road, but there are a lot of makers we look forward to seeing. Billy Mace Imel, Kevin Cashen, Ed Caffrey...

    We buy something when it suits our fancy. A lot of time we end of with material for scales. :)
     
    Fullflat, vkp78, Hard Knocks and 7 others like this.
  17. Casinostocks

    Casinostocks Factotum Platinum Member

    Mar 20, 2016
    Oh oh why did you give the wheels to Nathan? Unless you’re planning on getting there on time for Blade 2020? :p

    Or has Nathan nicked the phone, answering as NinJo? :confused:

    All kidding aside, have a blast y’all :)
     
  18. Casinostocks

    Casinostocks Factotum Platinum Member

    Mar 20, 2016
    Hi Nathan, what was your main takeaway(s) from this Blade 2019? Did your neurons go in overdrive with some new ideas? Were some of your own ideas complemented (as in bolstered) by your observations and feedback from others? Are you going to be moving some of the ideas on that white board of yours around, like moving something up the production pipeline and some in the back of the line.

    Just in case you preferred to drink yourself silly during the socializing hours, don't be bashful to just admit to that :p
     
    Last edited: Jun 10, 2019
  19. gusbuster

    gusbuster Gold Member Gold Member

    Aug 30, 2011
    Nathan have you done any experimenting with LC200n? I read somewhere that it’s supposed to have better edge retention than H1.
     
    Fullflat, woodysone and Odog27 like this.
  20. Casinostocks

    Casinostocks Factotum Platinum Member

    Mar 20, 2016
    Nathan, do you daydream? :p
     
    woodysone, gusbuster and Odog27 like this.

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