Mike Stewart: Convexed blades with convexed edges hold an edge much longer!

This is very subjective. What the blade is made from, its length, thickness, geometry, and primary use may be more important than the grind. Edge retention can be influenced by many factors besides how the blade is ground. For example, a flat ground blade made from 10v will hold its edge much longer than a convex blade made from s7.
 
They dont. There is nothing magic about them. And this is a video from a Bark River dealer, so the claims in it should be taken in that context.

And, for the record, I convex my v grinds.

Now cue the "more steel behind the edge" nonsense.
 
Mike Stewart is right!

Most of my knives are convex ground and it works like Mike says in the video.


Regards
Mikael
 
This is an old school ideology and what he says is true for the most part. Basically a zero edge style and it is extremely sharp. Many do not like it because it is a thicker edge. Khkuris are ground this way to prevent edge damage. It is certainly a stronger edge. I still prefer a v-type edge but I see nothing wrong with using a full convex grind for a hard use knife.
 
Edge retention is influenced by many factors. Does the edge blunt by deforming or chipping? Do you need a fine or a coarse edge? It's a difference if you use a knife for whittling/working with wood or if you use it to cut abrasive stuff like cardboard or carpet and so on..

Btw. none of my Bark River knives had a full convex grind.. there was always a clearly visible (non-convexed!) secondary bevel (not a polishing line.. just like an Opinel with the exception that Opinels are made from thin stock ground thin what makes them efficient performers) edge stability wasn't good at all so was edge holding (almost every knife chipped out readily after some mild usage, every knife needed re-sharpening or re-beveling until the edge stability and performance was acceptable). Back then I thought a Bravo 1 is a fine knife (still too expensive where I come from but still a fine knife), today I think it's just a sharpened pry bar. One of the worst knives I've ever handled is the Bark River Bushcrafter (regular & UL).. this geometry is so grossly inefficient that even the STS-4, their Combat/Utility knife, was a better knife for carving, food prep and so on. What Iz Turley (who does some really nice convex ground knives) had to say about this kind of grind is verified by my own experience: 'This grind is not good for much of anything in my opinion except for knives made from thin stock and narrow blades or large chopping knives. Even then it's still not a great performer.'
 
That's nothing more than marketing the way he wants to sharpen the knives he sells.

Take that with a grain of salt and sharpen your knives they way you want.
 
marcinek said:
They dont. There is nothing magic about them. And this is a video from a Bark River dealer, so the claims in it should be taken in that context.

And, for the record, I convex my v grinds.

Now cue the "more steel behind the edge" nonsense.
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Hmmm..

I v grind my convex edges so there....!!

What works for you is what works.
 
Ankerson said:
That's nothing more than marketing the way he wants to sharpen the knives he sells.

Take that with a grain of salt and sharpen your knives they way you want.
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Agreed.

I sharpen and strop as necessary to maintain my edges. I can't speak to what works better as I have no guideline or parameters outside of what works for me.
For the record, I've had two Bark River Knives(Bravo 1 and a Bushcrafter both in 3V), both cut and performed well without any issues. Can't say they performed any better than my Fehrman or my Striders but they definitely weren't worse.
 
marcinek said:
They dont. There is nothing magic about them. And this is a video from a Bark River dealer, so the claims in it should be taken in that context.

And, for the record, I convex my v grinds.

Now cue the "more steel behind the edge" nonsense.
Click to expand...

A covexed blade has both more metal behind the edge and more metal on the edge than a flat ground blade. Basic geometry
 
Cobalt said:
A covexed blade has both more metal behind the edge and more metal on the edge than a flat ground blade. Basic geometry
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But not for equal edge angles. Basic geometry. And the angle where two curves meet can be measured. Basic geometry.
 
marcinek said:
But not for equal edge angles. Basic geometry. And the angle where two curves meet can be measured. Basic geometry.
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I didn't know you could measure one angle for a curve. Let me know how u do that. Convex is a curve. Basic geometry
 
Cobalt said:
I didn't know you could measure one angle for a curve. Let me know how u do that. Convex is a curve. Basic geometry
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The two curves that form a convex grind meet at a point. The angle formed by the tangents to the curves at that point is the angle between the curves. More basic geometry.
 
A curve is an infinite set of angles made up to form the curve. I see how you are measuring the angle but that does not tell the story of the convex edge. The angle you measure is just one point of non measurable set of angles on a curve. You will not ever have equal angles for a convex that you do for a regular edge. Take a 2 inch wide blade one flat ground one convexed. There will be more metal on the convex blade all the way to the point. The only way that there isn't is if you make the convex blade less wide.
 
Cobalt said:
A curve is an infinite set of angles made up to form the curve. I see how you are measuring the angle but that does not tell the story of the convex edge. The angle you measure is just one point of non measurable set of angles on a curve. You will not ever have equal angles for a convex that you do for a regular edge. Take a 2 inch wide blade one flat ground one convexed. There will be more metal on the convex blade all the way to the point. The only way that there isn't is if you make the convex blade less wide.
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Your thinking only makes sense if you round off your edge...ie, dull it. A convex edge is formed by two intersecting curves. The form an angle where they meet.

Its mathematics. Mike Stewart, while a talented designer and marketer, cannot transcend it.

Go and Google intersection of curves.
 
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