How To Sharpen Recurve Knives

We outline how to put an edge back on a recurve knife, both by manual and automated systems.

Editor’s note: In addition to holding down a full-time job, being a BLADE® field editor for many years and conducting several sharpening seminars and BLADE University classes on the subject, the author also runs a sharpening service. All the sharpeners illustrated in the story are in his collection.

Face it—recurve blades are just plain sexy. The way the cutting edge adopts a sinewy figure is unlike most any other blade pattern and definitely catches the eye. 

A fun fact about recurve blades: the cutting edge is always longer than a standard blade of the exact same size. How? If you were to take the recurve edge and straighten it out and compare it with a more conventional blade of the same length, the recurve cutting edge would always be longer. Why? The curves pack in more steel real estate in the same overall blade length. Recurves are practical as well, as the curved part presents itself at an angle to whatever is being cut and therefore slices it more efficiently.
  
While recurves are attractive and functional, some folks tend to steer clear of them because they assume the edges must be difficult to sharpen. It’s the curvature that throws them off. I’m here to tell you that recurves are not hard to sharpen at all if you have the right sharpener. Once you have the right sharpener, the steps you follow are exactly the same as if you were sharpening a standard blade.   

Type Of Recurve Sharpeners

What sharpener do you use for recurve blades? There are actually quite a few sharpeners that are best suited. Some you may already have and didn’t know they would do the job. The appropriate sharpener has a round profile, as the round part always makes contact with the cutting edge regardless of how recurved the blade gets. I recommend that the sharpener be diamond coated since diamond works exceptionally well with the harder, more wear-resistant steels popular today such as—though not limited to—the CPMs of S30V, 20CV, S35VN, S45VN and MagnaCut.

In this article, I first show you how to properly sharpen recurve knives using a manual sharpener. The technique is the same regardless of which sharpener you use. Then I demonstrate how I sharpen recurve blades using a powered method. As the editor was so kind to point out, I run a sharpening service on the side as well, and I have years of experience sharpening all sorts of blades. My way is reserved for more advanced and more accomplished sharpening skills only.

How To Sharpen Recurve Knives

Manual Sharpening

Manual Step 1: Using a black permanent marker, preferably with a chisel tip, color in the entire length of the cutting edge on both sides of the blade.

Manual Step 2: Take a round profile sharpener—the author uses the EZE-Lap folding diamond sharpener—and, holding the blade to it at approximately a 20-degree angle, start at the tang and move your way down to the tip in one fluid motion.

Manual Step 3: Stop after a few strokes and look to see where the marker ink remains. This is an indicator of the need to adjust your angle more or adjust it less. And that, my friends, is pretty much how to sharpen recurves. Simple, safe and effective. This is a failproof method.

Automated Sharpening

Automated Step 1: The author uses his Ken Onion Elite Sharpener from Work Sharp with the blade grinding attachment to sharpen recurves. The illustrated belt deflection helps the belt to conform to the cutting edge as it curves.

Automated Step 2: The author sharpens the recurve blade as he would any standard blade by pulling it across the belt from choil to tip on both sides. Use the same motion when sharpening a recurve on a manual sharpener.

Automated Step 3: After sharpening, the author strops the edge using a leather strop to wipe off any micro burrs that form.

Automated Step 4: After stropping, the author gives the recurve a few swipes on a hanging kitchen knife steel to give the edge extra bite.  

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