It's not a bad thing to bring these things up in public. It will hopefully lead to Swamp Rat being more diligent about shipping out well-sharpened knives and avoid these incidents in the future. Keeping silent does more harm than good in the long run.
I agree :thumbup:
Or perhaps we could collectively recommend a target edge angle for various Swamp Rat knives?
For example, I received my RMD with a very fat edge from the shop, I'd estimate 30 dps, edge thickness ~0.04" at the shoulder. 30 dps = 60-inclusive, forming an equilateral triangle with the bevel shoulders. That is a
robust edge. It was sharp enough to carve wood, even sharp enough to slice printer-paper, but those are stiff media. Flesh is more pliable, it deforms around the edge as pressure is exerted. Pushing that edge against a tomato or summer-sausage wouldn't produce a clean cut without quite a bit of force, and the results weren't pretty.
Grind that edge down to 15 dps keeping the same spine-apex width, the primary bevel doesn't raise shoulder thickness much and the uncoated edge-bevel width roughly doubles but is still < 1/8" thick., but now the edge-thickness
at the same depth of penetration is ~ half that of the 30dps edge, requiring
less than half the cutting force to do the same amount of work!
"But," you may ask, "wouldn't cutting the edge-angle in half remove sufficient supporting metal to weaken that edge?"
SR101 (52100) at 60 Rc is hard enough to resist rolling at very low angles (much lower than 15 dps) but will likely chip if impacted against hard metal or rock even at 30dps. How much edge-durability does one gain with such a thick edge compared to the cutting performance one gains from a 15dps edge? Add to this that a thinner edge is easier to resharpen (an important factor given SR101's Rc and wear resistance), and another bevel could easily be added at the apex as damage does occur.
For reference:
http://www.youtube.com/watch?v=KaHR9GJe2e4&feature=plcp
If Swamp Rat knives are really among the toughest in the world, I think the edge-geometry should reflect that superiority.
Out of curiosity, I put some calipers on some of my bussekin, measuring thickness at the bevel shoulder behind the edge after resharpening each to 15dps:
Rodent Solution: ~0.03"
HRLM: ~0.04"
SYKCO 511:
~0.08"
Hog Muk (LE): ~0.02"
The 511 measurement was somewhat surprising to me as it illustrates a difference between the RMD and 511 I hadn't heard mentioned before - the 511 is ~2x thicker at the edge! This will translate to a stronger blade with inferior cutting performance. *shrug*
Please note, as Bussekin are semi-custom, these measurements may vary from knife to knife. Also, all but the Muk are coated blades...
EDIT: I've been exchanging e-mails with the shop (Lora), and I asked about slimming down the edge angle. She told me that, after speaking with the production manager,
"He informed me that if you would like to have a thinner edge... you only have to specify that when you order."
So there it is. The shop is willing to accommodate thinner grinds, but customers need to specify that when they order.
I guess that if we want the Swamp to make their
standard edges more acute, customers will have to make some noise.
Sooo... how popular is that idea, and what would be the best way to go about it?