Edge geometry is a really big deal, you'll have folks say that "steel X" is not as tough as "steel Y" with complete disregard to edge geometry meaning they are not testing steels they are testing geometry.
You'll also have some knife companies/makers argue how durable their steel is when in fact it's just thicker edge geometry and thicker blade geometry.
Here is an important page from Dr Larrin Thomas's book "Knife Engineering"
https://www.amazon.com/Knife-Engineerin ... 8800&psc=1
"What am I looking at?"
This is a destructive test showing the effects and differences between thinner and thicker edge angles with a edge impact tester.
Both conditions are AEB-L at 61rc clamped into the impacter which uses a gravity pendulum to swing a 3/16" (.1875") rod to impact into the edge so we can observe in a controlled manner how much impact energy these edges can absorb before failure.
The conclusion here is that 15dps is extremely delicate, only a little force needed before chipping you'll notice the same steel but at 25 dps can absorb a great deal more before large chipping is seen.
This is why it's absolutely crucial to customize your edge to your needs, if you want your knife to perform more like an axe, thicker geometry is inescapable. The best part is, you can change your angles if you change your mind.
What is not shown in this test is that the 15° per side edge can be considerably sharper and has significantly better cutting ability and sharpenability. So, what folks will do to enjoy the increased performance with low angles is they will avoid using that acute edge for non cutting tasks because the thicker edge can be a punishment to performance for actual cutting.
So take the red pill and escape the matrix, otherwise you're at the mercy of whatever YouTube video you watch where somebody or some company is telling you this or that when it's just plain old geometry.
So as the saying goes, geometry geometry geometry.
WilliamMunny wrote: ↑Fri Oct 07, 2022 7:56 am
Deadboxhero wrote: ↑Fri Oct 07, 2022 7:48 am
There's no "regardless of geometry"
That guy is using the factory edge to cut thin soft metal wire.
Have you measured the geometry of wire cutters?
Are they at 15° to 17° per side?
What happens if that gentleman resharpened his knife to 30° per side, if the edge takes less damage does that mean the s30v steel got tougher?
We have to go beyond the surface to see what's going on.
WilliamMunny wrote: ↑Fri Oct 07, 2022 6:39 am
Ramonade wrote: ↑Fri Oct 07, 2022 6:22 am
Sharpening is everything, and even if you buy a lot of knives before finding the best knife and steel combo for you, it sadly won't apply to anybody else but you !
We all use our knives differently for different tasks, and sharpen differently ! The number of factors going in between buying a knife and then liking it or not is so big that it is almost impossible to give objective feedback to help people in their choice.
It is amazing how many different steels there are on opposite sides of the spectrum that people swear by. I am always just trying to learn more, now going down the rabbit hole of “Toughness”.
Below is a neat video on a S30V Shaman chipping Chen it cut this thin plastic/wire ties used to hold toys in package. Regardless of edge geometry is that an indication of low “toughness” or more of a reflection of low strength and hardness? Because this is something I want my steel to cut on the rare occasion with less chance of damage.
Damage and tie down shown at 2:15 minute mark.
https://youtu.be/gn3aDv3jpJU
Is geometry more important than the steel? Will a well sharpened 8Cr out cut a poorly sharpened S90V?
If this is true you should start an online sharpening school. $50 per person for an hour class of 20 people giving live instruction on how to sharpen.