How to Use a Knife Sharpener | Straight From The Manuals

For the full breakdown, see our best Commercial Knife Sharpener guide.

Most knife sharpeners fail because of technique, not the tool. The standard mistake is sawing the blade back and forth in the slot, which fights the sharpening angle and makes the edge uneven. Whether you own a pull-through model, a rolling sharpener, or a rod-based tool, the basic movement is the same: a single-direction pull with steady, light pressure. The specifics depend on your sharpener’s design, and the differences matter more than most people expect.

Set Up Your Sharpener First

Before the blade touches the tool, the sharpener has to sit still. A moving sharpener causes the blade to hit at inconsistent angles, which is worse than not sharpening at all.

Place the sharpener on a flat, stable surface. Check the manual for model-specific requirements:

• The Sharpal 191H requires a stable, flat, non-porous surface and has a suction base you press down to lock it in place.
• The Sharpal 103N manual says to hold the sharpener firmly on a flat surface while you pull the blade through.
• Powered pull-through sharpeners from the Lowe’s guide need a firm, level surface to prevent tipping.

Some sharpeners specify water in the sharpening area or a wet blade before use. Others require an oil-free surface. Check your model’s manual, because using the wrong prep can damage the stone or the blade.

The Basic Pull-Through Technique

Pull-through sharpeners are the most common type, and the technique is straightforward once you know the angle and the direction.

Insert the blade fully into the slot at the angle the manufacturer specifies, then pull from the heel of the blade (the part nearest the handle) toward the tip in one smooth motion. Do not push back and forth. The motion is a single pull per pass, and you repeat it the number of times the manual directs — typically 3 to 5 passes per stage on the Sharpal 191H.

The angle matters. Most rod sharpeners call for holding the blade at roughly 20° against the rod.

Apply light, even pressure. Heavy force is unsafe and can gouge the edge or strip the abrasive.

Which Stage Should You Use?

Multi-stage sharpeners have different slots for different jobs, and choosing the wrong one is the most common cause of a damaged edge.

The standard rule: use coarse for dull or damaged knives, medium for slightly dull edges, and fine for honing and polishing. The Sharpal 191H follows this exactly — Stage 1 (Tungsten Carbide) is for dull or damaged knives, while Stage 2 (Ceramic) is for fine honing. The Work Sharp Precision Adjust directs you to move the blade along the cutting edge toward the tip during the sharpening stroke.

The sequence for a very dull blade is coarse, then medium, then fine. For a slightly dull blade, skip the coarse stage entirely and go medium to fine. Most manual-based sharpeners follow this same logic.

Serrated blades are the exception. The Sharpal manual warns not to use the coarse stage on serrated edges because it can damage the teeth. Use only the designated ceramic or fine slot when your manual allows serrated sharpening at all.

Finish And Clean The Blade

When the edge feels sharp along its full length, the job is done. A burr — a slight rough lip on the edge — is normal and indicates the edge has reformed; the Tumbler instructions note burr removal may take up to 6 repetitions per side.

After sharpening, wash the knife to remove metal filings and abrasive dust, then dry it thoroughly before storing. Moisture on a fresh edge invites rust, and metal particles in food are a risk no one wants.

If you’re sharpening for a busy kitchen or commercial setting, a heavier-duty tool handles volume better than a handheld model. Our tested roundup of the best commercial knife sharpeners covers the options that hold up under daily use.