How to Use a Knife Sharpener? | Get A Sharp Edge

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Most kitchen knives arrive dull from the factory, and a sharpener is the fastest way to bring back a working edge. The process itself is simple — the key is matching the technique to the sharpener you own and following the direction arrows molded into the base. Whether you have a manual pull-through, an electric model, or a whetstone, knowing how to use a knife sharpener properly takes about five minutes and saves you from ruining both the blade and the cutter.

The Basic Pull-Through Technique

The most common sharpener is the manual pull-through style, and Lowe’s advises a simple workflow: hold the sharpener on a flat, stable surface and keep the blade at a 90-degree angle to the sharpening surface. Insert the blade fully and vertically into the slot, then pull from heel to tip in the direction indicated on the base.

Key points that apply to nearly every pull-through model:

• Pull in one direction only — never saw back and forth unless the instructions explicitly allow it.
• Alternate pulls on both sides of the blade so the edge stays even.
• Use light, steady pressure; forcing the blade can chip carbide cutters or damage the edge.
• Repeat each stage 3 to 4 times, then test the edge.

Using A Multi-Stage Sharpener

Three-stage sharpeners work in a fixed order: coarse, medium, then fine. Start with the coarsest slot only if the blade is noticeably dull — daily maintenance usually skips straight to the finer stages.

Lee Valley’s instructions for their knife sharpener say to hold the handle in one hand, draw the knife through the cutters 3 to 4 times with light pressure, and use more passes for very dull knives. They also warn that excessive force can chip the carbide cutters, and note the cutter unit can be rotated or flipped if one edge gets damaged. One 3-stage sharpener manual confirms the rhythm: repeat each stage 3 to 4 times or until the knife is sharp, moving from coarse to medium to fine.

Some models add honing or stropping stages after the fine slot. If yours has them, run the blade through those last — they straighten the edge without removing metal.

Electric Sharpeners: Different Rules

Electric sharpeners follow the same angle logic but add a few safety steps. Place the unit on a firm, level surface, turn it on, then choose the slot by how dull the blade is — the coarse slot for blunt knives, the fine slot for daily touch-ups.

Pull the knife heel-to-tip at a constant speed, with the blade vertical. One electric sharpener manual lists 4–8 seconds for metal knives in the coarse slot, and 6–10 seconds for ceramic knives. After sharpening, turn the unit off and unplug it before putting it away. Never leave a running sharpener unattended, and keep fingers clear of the slots.

What Not To Do

Most sharpener damage comes from technique mistakes, not equipment failure. Avoid the two big ones:

• Don’t use heavy pressure. The cutters do the work; pressing harder only risks chips and uneven edges.
• Don’t ignore directional arrows. Some sharpeners are side-specific for right- or left-handed use, and some models handle only certain blade materials. Check the base before your first pull.

If your knife is ceramic, check whether your sharpener supports it — many electric models treat metal and ceramic differently, with separate instructions for each.