For the physics guys – what are the structural benefits of a saber grind?

Dennis in MA said:
I've never done a side-by-side, but I always thought it was the exact opposite. It sliced easier b/c the angle goes to zero after a certain point.

Or maybe I'm thinking stick-ability when chopping wood.

Basically, I'm just padding my postcount at this point. Sorta like Solstice just did, only looking like I'm trying. LOL
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Oops....double tap. So sorry!


:p:D

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See I wasn't at all surprised by the increased chopping effectiveness of the saber grind - within reason, you are making the balance more blade heavy at the same thickness, and putting more weight into the swing. The only argument for a saber grind choppig worse is that it has a more obtuse geometry, meanin it might not bite deeply as easily. In every other sense, the saber grind has all the cards in it's favor for chopping - hence why the dfcg outchops the dfle and the same is true of the sod.


The reason for my preference for a full flat over a saber grind is that the full flat is more VERSATILE. And if you throw convex into the mix, you get most of the benefits of the saber with few of the drawbacks.
 
The original question did ask about "structural benefits". So that is a statics/dynamics question.

Now gravity... if the saber grind has more mass does it attracts more hogs???
 
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Sometimes I think Busse/Bussekin knives in the 5 inch full tang range ( the S5LE has a hidden type of full tang .... much more substantial than most hidden tangs ) are partly done as sabre grinds for balance .... as well as partly for strength ..... the RMD and the S5LE both have good balance .... more so the RMD for neutral balance with the S5LE being slightly blade heavy .... but they would not be so light in the hand if flat ground ... they would both feel slightly handle heavy .... and I suppose being the knives they are they need to offer some ability in the "pry bar" role .... just in case ... however if properly shapened their slicing ability is good in my experience .... and I use both of these knives a lot for food preperation .... they work well for me :thumbup:
 
Will, thanks for the link. I happen to have three SJTACs that all measure in at .22". One is saber, one is flat, and one is convex. All three have micarta handles so that should not be an influence to balance. The balance for the flat grind is just behind the first tube fastener, for the saber is right at the first tube fastener, and the convex is well in front of the first tube fastener. With that I think I have to agree with MM; the convex should give you the best performance of all three.

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OldPhysics said:
But then, it's a very "good" physics question.:);)

I wonder ... can we introduce a discussion of gravity? Perhaps not ...
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well, if you place a Satin Sabre Ground SFNO on top of a shiny new bowling ball, and it begins to slide down (and off) the side of the bowling ball, at what precise point does the SFNO leave the surface of the bowling ball?

or something like that...
 
DowntownDM said:
well, if you place a Satin Sabre Ground SFNO on top of a shiny new bowling ball, and it begins to slide down (and off) the side of the bowling ball, at what precise point does the SFNO leave the surface of the bowling ball?

or something like that...
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lol:D:D:D
 
findx.jpg
 
sabre grind just makes a beefier edge, I believe it'll hold up better for cutting into hard man-made materials or dense natuals, like if you're gonna cut metal bands, wires, or into bone a lot, you prob wanna go with a sabre grind, it won't slice paper like a convex with the same terminal angle, but under the above scenarios a convex will roll, and if not infi it'll chip much easier. Convex seems to be more fitted towards natural materials and softer man-mades, ie. skin, wood, rope.... etc
 
UDDwaine said:
Thanks for posting Will, interesting reading.
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I thought so too and I found that the Saber grind is much stiffer and doesn't transfer vibration as much as other grinds. :)

Like on the FFBM, no vibration at all. :thumbup:
 
Thanks for the great thread Will. :thumbup: Now I've got to aqquire some saber grind blades. :( :)
 
OldPhysics said:
But then, it's a very "good" physics question.:);)

I wonder ... can we introduce a discussion of gravity? Perhaps not ...
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Sure...& why not the electromagnetic spectrum as well (of which i vaguely recall very little) ? Surely the saber grind "bends light" somehow differently, creating the dreaded Dark Ninja Effect?
 
As soon as I'm done inputing, I'll have your answer in about a week...

very_old_computer.jpg
 
Something not mentioned so far in this discussion is tip thickness/strength. I don't keep any with me at work :rolleyes: but IIRC the flat grind version of the SFNO has a thinner tip than the original sabre grind. That might matter, depending on how bad you are abusing the knife. Looking at the pics of the Regulator, it seems this does not apply as the sabre grind ends well back on the clip. On the SFNO, the sabre is carried much further forward.
 
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