How to Use a Rolling Knife Sharpener: The Complete Step-by-Step Guide

To use a rolling knife sharpener like the Tumbler Rolling Knife Sharpener, attach the knife to the magnetic angle block (15° for fine or Japanese-style edges, 20° for most Western knives), roll the diamond disc along the whole edge with light pressure until you feel a burr, repeat on the other side, then finish with a few honing passes.

Still deciding which sharpener to buy? Start with our guide to choosing a rolling knife sharpener. This guide is for the moment after the box is open.

What do you need before you start?

You need four things: the sharpener and its magnetic angle block, a stable and flat surface, a cloth to wipe the blade, and the knife itself, clean and dry. A leather strop is optional for a final polish. Nothing else is required.

• The sharpener and angle block. On the Tumbler Original that's a diamond disc on one end of the roller, a steel honing disc on the other and a magnetic block with 15° and 20° sides. The Tumbler Pro pairs a 4-layer diamond disc with an EdgeBoost ceramic disc.
• A stable surface. A kitchen counter or a cutting board works. For tall knives, Tumbler's official instructions say to "support the Tumbler Rolling Sharpener with a cutting board so the sharpener is elevated to the level of the cutting edge."
• A cleaning cloth, plus an optional leather strop (more on that below).

What angle should you choose: 15° or 20°?

Choose 20° for most Western kitchen knives, such as German-style chef's knives, utility knives and cleavers. Choose 15° for fine or Japanese-style edges that were made thinner at the factory. As the Tumbler FAQ puts it, "A 20-degree angle is a more robust angle than the steep 15-degree cutting angle which might offer more precision."

A narrower angle cuts more keenly but wears faster; a wider one holds up better to hard use. Our guide to picking the right sharpening angle for your kitchen knife explains the reasoning in detail.

One practical rule: match the angle your knife already has. Moving a 20° edge to 15° means grinding away a lot of steel before a new edge forms. That's one of the reasons a freshly "sharpened" knife can still feel dull (more on that here). If you're unsure, check the knife maker's website.

How do you sharpen a knife with a rolling sharpener? (step by step)

Attach the knife to the magnetic block, roll the diamond disc along the full edge with light pressure until you feel a burr, then turn the knife and repeat on the second side. Finish with a few honing passes per side, wipe the blade and test the edge. The steps follow Tumbler's official instructions, with the reasoning added.

1. Attach the knife to the magnetic block on a stable surface

Set the block on a counter or cutting board and let the flat of the blade snap onto the angle side you chose, with the edge facing up and out toward the roller's path. Check that the block can't slide and the knife is seated flat.

Tip: Position the knife so the roller can reach the whole edge, heel to tip. If the tip hangs well past the block, reposition it.

2. Roll the diamond disc along the entire edge with light pressure

Put the diamond disc against the edge and roll the sharpener back and forth along the full length of the blade. Keep the roller flat on the counter. The instructions are emphatic on two points: "Use a light amount of pressure!" and "Don't forget the tip!"

Tip: Pressing hard flexes the blade. Let the disc do the work.

3. Check for a burr before you switch sides

A burr is a thin lip of metal that folds over to the opposite side of the edge once you've ground all the way to it. To check, draw a fingernail or fingertip gently from the spine side down and off the edge. Work Sharp describes it as pushing your finger off the edge, "from spine to bevel". Never slide your finger along the edge.

Tip: Check the heel, middle and tip. A partial burr means part of the edge isn't done yet.

4. Rotate the knife 180° and sharpen the second side

Take the knife off the block, turn it around and reattach it so the other face sits on the same angle side. Repeat the diamond-disc passes until the burr forms on the first side. Tumbler's instructions describe this as "rotate the knife 180°" so that both sides are sharpened evenly.

Tip: Roughly match the effort on each side. If one side gets twice the passes, the bevel ends up lopsided and the knife can steer in a cut.

5. Flip the roller to the honing disc and finish both sides

Turn the sharpener end-for-end so the honing disc faces the blade: a steel disc on the Tumbler Original, the EdgeBoost ceramic disc on the Tumbler Pro. Use the same light rolling motion on both sides. This step removes the burr and refines the edge. For the Original's steel honing disc, Tumbler's instructions say, "Here you need a maximum of 6 repetitions for each side." On the Tumbler Pro, use light passes and stop once the burr is gone.

Tip: More honing isn't better. A stubborn burr usually points back to step 2 or 4.

6. Wipe the blade clean

Wipe both sides of the knife with a cleaning cloth to remove the dark abrasive dust left from sharpening.

7. Test the edge and repeat if needed

Run the fingernail check once more. Tumbler's instructions say to "Check with your fingernail whether a burr can still be felt on the cutting edge" and to repeat sharpening and honing if it can. Then do a paper test (next section) to confirm the edge is sharp from heel to tip.

How do you get the tip and heel sharp?

To sharpen the tip and heel, position the knife so both ends sit inside the roller's path, then roll all the way to the tip on each pass instead of stopping short. For taller blades, raise the sharpener on a cutting board so the disc meets the edge squarely. Check for a burr at both ends, not just the middle.

This is where rolling sharpeners take the most criticism. America's Test Kitchen marked the Tumbler Original down because "its abrasive cylinder was too low to reach and sharpen the full length of our knife edge," and The Kitchn noted that "sharpening the tip of the santoku knife was tricky." Strongly curved tips and very tall heels take more care than flatter profiles. Our upcoming heel-to-tip technique guide covers positioning and passes in detail.

How do you know when the knife is sharp?

A sharp knife passes three checks. You can't feel a burr anywhere along the edge. It slices cleanly through a sheet of printer paper from heel to tip without snagging. It cuts into a ripe tomato skin with little downward pressure. If the knife snags at one spot, that's the section to go back to.

The burr check is the one from step 3: a lingering burr feels like a faint catch as your nail slides off the edge.

The paper test is America's Test Kitchen's go-to check: hold a sheet of printer paper by the top edge, draw the blade down through it heel to tip, and "the knife should glide through the paper and require only minimal pushing." ATK also advises noting where the blade snags and focusing there.

The tomato test is a quick kitchen check. A sharp edge breaks the skin as soon as you start the slice, while a dull one skates across it and squashes the tomato.

A sharp edge is also safer. As ATK's Hannah Crowley put it, "You can use less force and because it bites in right wherever you put it, rather than sliding off, so there's less of a chance for accidents."

What are the most common rolling-sharpener mistakes?

The most common mistakes are pressing too hard, stopping before the tip, switching sides before a burr forms, skipping the honing disc, giving one side far more passes than the other, working on a surface that shifts, and letting a long blade flex. Each one leaves part of the edge dull or uneven, and each is easy to fix.

1. Too much pressure or a tilted roller. Bearing down can flex the blade off the block, and tilting the roller as you push has a similar effect. One BladeForums user warns that curling the roller "makes it skid and not roll" (BladeForums). Keep it flat and let the diamond do the work.
2. Skipping the tip. It's the reason Tumbler's instructions include the exclamation point. Roll to the very end on every pass.
3. Switching before a burr forms. Without a burr, the grinding hasn't reached the edge yet. Moving on early leaves the knife only partly sharpened.
4. Not honing. A burr left on the edge folds over as you cut, so a freshly sharpened knife can feel dull again fast.
5. Uneven passes per side. A lopsided bevel can make the knife steer in cuts. Keep the effort roughly equal on each side.
6. An unstable surface. If the block slides, the angle changes mid-pass. Use a flat counter or a cutting board that doesn't rock.
7. A long knife flexing. On long slicers, the same forum thread notes that "long blades flex and throw everything off." Keep pressure light, keep the roller flat and reposition the knife rather than reaching.

What if the knife is very dull or chipped?

A very dull knife just needs more time on the diamond disc, and it may take more than one session. That's normal, not a sign that something's wrong. For real chips or dents, you need a coarser abrasive. On the Tumbler Pro, that's the Tumbler Coarse Diamond Disc #150, used first before you switch back to the standard diamond disc.

NBC Select's reviewer found the roller "best as a frequent maintenance tool as compared to one that totally revives completely dull knives,". That's a fair expectation. A long-neglected knife has a lot of steel to remove before a burr forms, so split the work across sessions.

For a chipped edge, fit the Coarse Diamond Disc #150 to the Tumbler Pro, rebuild the edge, then return to the standard diamond disc and hone as usual. Compatibility note: the Coarse Diamond Disc #150 fits Tumbler Pro models purchased after June 1, 2025 (look for the hex recess above the screw threads). It is not compatible with the Tumbler Original, whose discs are fixed. To see how the two models differ, compare the Tumbler Original and Tumbler Pro side by side. Our guide to the Pro disc system is coming soon.

How should you use the strop and honing disc between sharpenings?

Between full sharpenings, keep the edge in shape with a few honing-disc passes per side, or a few strokes on a leather strop, whenever the knife starts to feel less keen. Go back to the diamond disc only when honing no longer brings the edge back. Plan to hone far more often than you fully sharpen.

Sharpening grinds a new edge; honing refines the one you have. Wikipedia's entry on honing steels states the limit: "A traditional smooth honing steel is of no use if the edge is blunt, because it removes no material." The same logic applies to your honing disc and strop. They maintain an edge, but they can't create one.

For frequency, knife makers offer useful benchmarks. Shun suggests that "depending on use, you may wish to hone your knives only once a week or so," while Zwilling's Bernard Janssen told Simply Recipes that for daily use he recommends "honing a few times a week," and that home cooks only need to sharpen "two to three times a year."

A strop is the gentlest finishing step. The Tumbler Companion Strop is designed to "polish and finish your blade after sharpening." Tumbler's strop instructions come down to one rule: move the blade so the edge trails behind, never pushing the edge into the leather ("Do not move the knife against but with the edge"), and keep the angle so only the cutting edge touches the leather. A full stropping guide is coming in November.

Troubleshooting: why isn't it working?

Most problems trace back to one of four causes: no burr was raised, the tip or heel sat outside the roller's path, the pressure was too heavy or uneven, or the burr was never fully removed. Use the table below to match what you see to its likely cause, then apply the fix before starting over.

Symptom	Likely cause	Fix
Knife still feels dull after sharpening	Switched to the honing disc before a burr formed along the full edge; or the angle doesn't match the knife's existing edge	Go back to the diamond disc and keep rolling until you can feel a burr heel to tip, then hone. Stay on the angle the knife already has.
Middle is sharp, tip is dull	Tip sat past the roller's path, or passes stopped short of the tip	Reposition the knife so the tip is inside the path and roll all the way to the end. Paper-test the tip separately.
Heel is dull on a tall knife	Disc not meeting the edge squarely at the heel	Raise the sharpener on a cutting board so it sits level with the cutting edge, as the instructions describe.
Visible scratch marks on the blade face	Roller tilted or skidding, often from heavy pressure; knife not seated flat on the block	Reseat the knife, keep the roller flat on the surface, and lighten your pressure.
Bevel looks wider on one side	Uneven passes per side	Even it out with a few extra diamond passes on the narrower side, then hone both sides equally.
Burr won't go away	Heavy pressure on the honing disc, or the burr formed unevenly	Hone with very light pressure, alternating sides. If it persists after the recommended passes, strop or repeat one short diamond pass per side, then hone again.

Still no edge? The Tumbler FAQ covers blade-specific questions, and our 2023 post on why a sharpened knife can still be dull walks through the angle problem in more depth.

When isn't a rolling sharpener the right tool?

A rolling sharpener isn't the right tool for serrated or bread knives, ceramic knives or single-bevel Japanese knives. It also isn't the fastest option for a badly neglected blade, which may need several sessions or a coarser disc. It works on smooth-edged kitchen knives, cleavers and folding or hunting knives.

• Serrated and bread knives. The Tumbler FAQ is direct: "The Tumbler roller grinder is not suitable for serrations," and trying it can damage the diamond disc. Use a tapered rod made for serrations, or a professional service.
• Ceramic knives. "Ceramic is not magnetic and as a result, knives with ceramic blades cannot be fixed to the magnetic holder." Ceramic blades need a diamond tool built for them or the manufacturer's sharpening service.
• Single-bevel knives (some traditional Japanese styles) need a different approach from the double-bevel steps above. Check the FAQ or contact Tumbler support before sharpening one.

FAQ

How many passes should I do on each side?

There's no fixed number for the diamond disc. Keep rolling until you can feel a burr along the full edge, then match that effort on the second side. For the Tumbler Original's steel honing disc, Tumbler's instructions call for a maximum of 6 repetitions per side. On the Tumbler Pro's EdgeBoost ceramic disc, use light passes and stop once the burr is gone.

Do I need to sharpen both sides of the knife?

Yes, for standard double-bevel kitchen knives. Tumbler's instructions have you rotate the knife 180° and repeat the diamond-disc passes so both sides are sharpened evenly. Single-bevel knives are the exception; check the FAQ or contact support before sharpening one.

How do I know when to switch from the diamond disc to the honing disc?

Switch once you've raised a burr, a slight lip of metal you can feel when you draw a fingernail off the edge from the spine side, along the entire length on both sides. If there's no burr yet, the diamond disc hasn't finished its job.

How often should I use the honing disc vs. a full sharpening?

Hone whenever the knife starts to feel less keen, which for daily cooking might be weekly or a few times a week. Do a full diamond-disc sharpening only when honing no longer brings the edge back. Zwilling's Bernard Janssen says home cooks typically only need to sharpen two to three times a year.

Why does my rolling sharpener make a scratching noise?

That's the sound of abrasive contact with steel, and it's normal. NBC Select's reviewer described "a slightly scratchy sound that, while not grating, can be quite irritating." A loud grinding or skidding sound usually means too much pressure or a roller that isn't flat on the surface.

What's the dark residue on my knife after sharpening?

It's abrasive dust from the sharpening process. Tumbler's instructions say to clean the knife with a cleaning cloth after sharpening, so wipe both sides from spine to edge before you cook.

Guides in this series

• Heel-to-tip technique: getting the tip and heel sharp on a roller
• The Tumbler Pro disc system explained
• How to strop a knife
• How often should you sharpen your knives?
• How to tell if a knife is dull
• Why is my knife still dull after sharpening? (refresh coming soon)
• How long does it take to sharpen with a rolling sharpener?
• Sharpening grit chart
• Knife sharpening myths
• Diamond vs whetstone vs ceramic
• How to fix a chipped knife

Sources

• Tumbler, Instructions
• Tumbler, Frequently Asked Questions
• Tumbler, Strop Instructions
• Tumbler, Compare Tumbler Rolling Knife Sharpeners
• Micki Wagner, The Kitchn, Tumbler Diamond Rolling Knife Sharpener review (updated Aug 3, 2026)
• Cory Fernandez, NBC Select, Tumbler knife sharpener review (Dec 6, 2024)
• America's Test Kitchen, The Best Manual Knife Sharpeners (updated Jul 9, 2025)
• Hannah Crowley, America's Test Kitchen, Which Knife Sharpener Is Right for You? (Jun 8, 2022)
• America's Test Kitchen, Testing Knife Sharpness
• Work Sharp, I've Raised a Burr, What's Next? (Jun 3, 2020)
• Wikipedia, Honing steel
• Shun, FAQ
• Simply Recipes via AOL, How often to sharpen knives, according to an expert (Apr 26, 2026)
• BladeForums, Rolling sharpeners: why not favored?

By Team Tumbler