The Proper Burr Removal Technique During Knife Sharpening

What Is a Knife Burr and Why Does It Matter?

A burr, also known as a wire edge, is what you get when you put a metal knife through the sharpening process, forming where the bevels meet at the knife's primary edge. Burr is essentially the worn-out metal, which you remove from both sides of the primary edge through the act of sharpening.

It's important to understand that proper burr formation tells you if the knife is being sharpened properly. Many sharpeners actually aim to form a burr as an indicator that they've reached the edge. But here's the catch: if burrs are left on the blade, it won't cut sharply.

Why? When a stable burr is formed, the metal forms thin plates that resemble foil hanging at different angles. As the burr has a very thin structure, left on the knife it can act like an aggressive microsaw, appearing sharp when cutting soft material but crumpling into a thicker lump and stopping the knife when contacting hard material.

Detecting the Burr Before Removal

Before you can remove a burr, you need to know where it is and how pronounced it is. Hold the knife securely by the handle, put your free hand's thumb on the opposite side of where you were sharpening, move down the knife blade from tip to handle gently pushing your thumb along the blade surface so it slides off the edge in each smooth movement, ensuring your thumb is 90 degrees to the edge.

If you feel a thin, flimsy piece of metal sticking up along the edge, that's your burr. Some people describe it feeling like a hair on the edge of the blade.

Progressive Burr Removal Through Grits

The key to burr removal is patience and pressure control. Once the burr is created, that same stone can be used to start the removal of it at much lighter pressure for just a few passes, then move to the next stone and continue the process, with pressure getting lighter and lighter as you progress through the grits.

Alternate strokes, making one pass on the left side of the bevel and one on the right, since fine abrasives remove material slowly and alternating maintains symmetry, using lighter pressure with each stroke. The goal is to thin the burr down bit by bit rather than create a thick one that needs aggressive removal.

Common Burr Removal Techniques

Stropping with Leather or Newspaper

The easiest way to remove burrs is to simply use newspaper, sometimes referred to as stropping, by spreading newspaper on a stable surface and gently rubbing both sides of the sharpened knife edge a few times. If you don't have newspaper readily available, you can also use cloth fabric.

Important note: stropping action should always be edge trailing, meaning you're moving the spine of the blade first, with the edge following behind. This prevents you from cutting the material you're using.

Using Natural Materials

A wooden block made of sufficiently hard wood can be used, or alternatively, jute or hemp rope, felt, cardboard or wine cork. Cutting corks is a popular method of burr removal, as is cutting into the end grain of a piece of pine.

The benefit of these methods is that they're gentle and accessible—many people have old wine corks or scrap wood lying around their workshop.

Higher-Angle Stone Passes

Try increasing your angle and decreasing the pressure on the stone significantly, going up to 40 degrees per side with the edge barely touching the stone, creating a tiny microbevel with no more than one or two passes per side, then back hone at the desired angle with very light pressure.

This technique works by creating a controlled microbevel that removes the burr without damaging your primary edge.

What to Avoid When Removing Burrs

It helps to form as small a burr as possible when sharpening initially, eliminating the need to remove a large floppy burr in the first place. Pressure control during the initial sharpening is your first defense.

Also, avoid this common mistake: less pressure, less pressure, less pressure. Many sharpeners try to force the burr off with heavy pressure, which either creates a new burr on the opposite side or damages the edge.

One final tip: doing light sharpening on the opposite side is the way to solve the burr issue and remove them. This is why professional sharpeners work both sides of the blade, even if you're primarily sharpening one bevel.

Final Polish and Testing

After you've removed the burr through your preferred method, once you have removed the burr the knife will have a sharp, working edge. A quick test is to carefully cut through newspaper or a piece of paper—a truly sharp, burr-free knife should slice cleanly without dragging or crushing the paper.

Mastering burr removal is one of the most valuable skills you can develop as a knife sharpener. It's the difference between a knife that looks sharp and one that actually performs sharp.

If you're sharpening with a rolling system, the progressive grit approach becomes even easier to manage. Starting coarse to reprofile, then moving through medium and fine grits with decreasing pressure, naturally guides you toward a clean, burr-free edge by the time you reach your finishing stones.