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Thread: Hollow Ground and Flat Ground

  1. #1
    Spyderco Forum Registered User enyong112's Avatar
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    Hollow Ground and Flat Ground

    Hi Guys,

    I'm relatively new, how can you tell if the knife has a hollow ground or a flat ground? w/o looking at the blade profile up close I mean from the point like in the picture, can you tell by looking from the side?

    What 's have hollow grounds? Flat grounds?
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    1 is hollow; 2 is full-flat.
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    Spyderco Forum Registered User
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    You usually can tell by looking at the side also. After you see a few it gets easier to tell them apart.

    I did see a really nice super-flat ground Military this past weekend. It was done by Alan Folts, it is his personal Military. I thought the Military was thin already, but he thinned it out some more. Really smooth looking, and thiiiiin.
    I am edcing my CPM-D2 Military now, but I want to find a S30v Military and pay Alan to make it even thinner.


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    Spyderco Forum Registered User Raqudu's Avatar
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    Look at the way the light hits the blade in the photo. The curve of the hollow grind will reflect the light differently than a flat grind. A full flat grind will of course not show a break line like a saber grind, either flat or hollow.
    Raqudu

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    Spyderco Forum Registered User Murdoc's Avatar
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    Well,

    let' see if I can get this right:


    1. Hollow saber ground (i.e. SS Delica, SALTs)

    2. Full flat ground (i.e. Caly3, Manix, Stretch)

    3. Flat saber ground (i.e. FRN Endura, Delica)

    4. chisel ground (all serrated blades)

    5.flat saber ground with MASSIVE secondary bevel (not sure about that)

    6. that's what is called "ballig" in german; the dictionary translates it to "crowned" or "spherical". Please correct me with the right term for it. AFAIK mostly found on custom knives.

    Dennis

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    Spyderco Forum Registered User SimpleIsGood229's Avatar
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    As Tom Krein, himself, just said to me, not 25 minutes ago, "Full flat grind is where it's at."

    What more can possibly be said?
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    Spyderco Forum Registered User enyong112's Avatar
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    I got the picture from wikepedia its:
    1. Hollow ground
    2. Flat Ground
    3. Sabre Ground
    4. Chisel Ground
    5. Double Bevel
    6. Convex Ground
    ***********************
    examples please for 1, 2 and 3 please.
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    Spyderco Forum Registered User Lostification's Avatar
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    Haha, I was gonna say concave on #6...
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    Spyderco Forum Registered User Peter1960's Avatar
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    Quote Originally Posted by Murdoc View Post
    ...6. that's what is called "ballig" in german; the dictionary translates it to "crowned" or "spherical". Please correct me with the right term for it. AFAIK mostly found on custom knives.
    Servus Dennis,

    point 1 - 5: quite correct

    A sample for edge type #6 is the original FB01 Bill Moran (with leather sheat) IMO only on this SKU Spyderco used the "balligen Schliff" (sorry for all English Speakers, I don't know the translation too).
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    Spyderco Forum Registered User Bolster's Avatar
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    Recent Poll

    Here's the results of a recent poll of preferences for grind types. If I could find it, I'd bump it so you could vote.
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  11. #11
    Spyderco Forum Registered User Murdoc's Avatar
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    Hi Peter,

    ok, since I don't own a FB Spyderco, it becomes clear why I didn't know it would be an example for "convex grind" Thanx for that....they are somehow flying under my radar right now

    Quote Originally Posted by enyong112
    examples please for 1, 2 and 3 please.

    That's what I did in my 1st post
    and Peter gave one for the grind #6, so I think we're quite complete now

    Of course, there are MUCH more spydies as ex. for every grind, but I listed some of the more common models.

    For me, full flat ground too, please :-)

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    Spyderco Forum Registered User
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    And I like them all.

  13. #13
    Spyderco Forum Registered User enyong112's Avatar
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    Quote Originally Posted by Murdoc View Post

    That's what I did in my 1st post
    and Peter gave one for the grind #6, so I think we're quite complete now

    Of course, there are MUCH more spydies as ex. for every grind, but I listed some of the more common models.

    For me, full flat ground too, please :-)
    Thanks Murdoc, I was waiting for the Native to pop up in the examples...
    I own a Caly Jr. it cuts beautifully, full flat grind also for me...
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    Spyderco Forum Registered User dete's Avatar
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    I like #3 & #5

    the blade seems to get fatter faster.

    stronger & earlier bigger opening

  15. #15
    Spyderco Forum Registered User Murdoc's Avatar
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    Quote Originally Posted by enyong112
    Thanks Murdoc, I was waiting for the Native to pop up in the examples...
    Hmmm... looking at my black bladed Native right now, I would have said: closer to #3, flat saber ground :-)


    BUT the online catalog says:

    The blade itself is hollow-ground CPM-S30V steel with a weight reducing swedge ground from the spine.
    which would be #1.

    Who am I to argue with the catalog?

    Dennis

  16. #16
    Spyderco Forum Registered User Peter1960's Avatar
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    Dennis, you set my nerves on the edge. From my memory I would say all Natives have hollow ground blades. Who am I to trust my memory? A good reason to check all my Natives and what do I see: all are hollow ground
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  17. #17
    Spyderco Forum Registered User Murdoc's Avatar
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    Peter,


    I wasn't sure about it because I was ambivalent when trying to FEEL it; and the "light-trick" (meaning to see how the light is reflected, like Raqudu explained) obviously doesn't work on my COATED blade

    But I have an OIF Native on the way, so this problem will be solved soon

    OT on- looking forward to this very special Native... I love the looks of the tan colored handle and the unpainted metal parts! -OT off


    When looking at my pacific Salt, it was easy to tell, though. That's why I included the SALTs in my original post and not the Native. After all, it was intended to help enyong112 to distinguish between the grinds, even when looking at a pic

    Dennis

  18. #18
    Spyderco Forum Registered User Murdoc's Avatar
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    Ok, my OIF Native is here, and I love it!

    (I'd want to be the purchase seen as an act of respect for the soldiers who risk their lives everyday, not as a disrespectful pretension or arrogation on my side.)

    Anyway: NOW with the non-coated blade, the HOLLOW grind couldn't be more obvious

    And as a sidenote, the action of this Native is SO MUCH better than that of the Black bladed Native! It opens smooth and without the "roughness" I was used to with the C41BBK. I think that this problem is due to the coating, but it is kind of annoying sometimes...and on top of that, the OIF Native is clearly on a different (=better) sharpness level. I'll call this "Scary Sharp" anytime!

    @enyong112, if you want to, I'll happily post a pic of the hollow ground Native (and Salt :-)) next to a saber flat ground Delica or Endura to show the differences on a picture. In fact, I never paid too much attention to this difference before

    Dennis

  19. #19
    Spyderco Forum Registered User enyong112's Avatar
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    Quote Originally Posted by Murdoc View Post
    @enyong112, if you want to, I'll happily post a pic of the hollow ground Native (and Salt :-)) next to a saber flat ground Delica or Endura to show the differences on a picture. In fact, I never paid too much attention to this difference before

    Dennis
    Hey Dennis.. Could you please post that... Thanks for the offer man.
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  20. #20
    Spyderco Forum Registered User Murdoc's Avatar
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    Hi enyong112,

    done....

    but it was more difficult than I originally thought to catch the difference in a pic

    I played with my own shadow to show it, and finally, it worked out - sort of...

    On the hollow saber ground, the light (of shadow, if you want) is reflected in different angles, whereas on the flat saber ground, it it the same all over the both flat parts of the blade. I think the pic in the middle shows this best:








    Hope it helps


    Dennis

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