How Knife Sharpening Works

Let's be honest about your knife for a second.

It has opened Amazon boxes. It has cut a frozen bagel. It has, at least once, been used to pry the lid off a can of paint.

We're not judging. (We're judging a little.)

The good news is that almost any kitchen knife can come back from this. Here's how.

First, why knives go dull at all

The edge of a knife is unbelievably thin. Thinner than a hair.

Every time it hits a cutting board, that thin edge bends a tiny bit. Do that a few thousand times and the edge is folded over, flattened and nicked. It doesn't slice anymore. It just sort of pushes.

A dull knife isn't missing sharpness. It's sharpness that got bent out of shape.

So sharpening isn't adding anything. It's taking off the bent, beat-up metal and making a brand new edge underneath.

We do that with up to three wheels. Think of it as a spa day. (Most knives only need two of the treatments.)

Wheel 1 (only if needed): the fixer wheel

This is the chiropractor. And like a chiropractor, most knives never need it.

The fixer wheel is only for real damage: chips, big nicks, a bent tip, a tip that's seen things. It grinds away the beat-up metal until there's clean, solid steel to work with.

A normal dull knife skips this step and goes straight to wheel 2. The fixer wheel is for the Gary knives.

Wheel 2: the fiberglass wheel

This is the haircut.

Now that the knife is in one piece again, the fiberglass wheel puts the actual edge on it. This is the step that turns "less dull" into "oh wow, careful."

We sharpen it at the angle your knife came with. A thin Japanese knife stays thin and sharp. A heavy German knife stays tough. We don't make every knife the same, because they aren't.

But this step leaves one little problem behind.

Wheel 3: the cloth wheel

This is the blowout.

Grinding a new edge leaves a tiny flap of loose metal hanging off it. It's called a burr. It's so small you can barely see it, but you can feel it.

And here's the sneaky part: the burr feels sharp. It's not. It's flimsy. Cut four tomatoes and it folds over, and suddenly your "freshly sharpened" knife is dull again.

The cloth wheel buffs the burr away. What's left is a clean, smooth, finished edge that actually lasts.

Skipping the cloth wheel is like getting a haircut and leaving with the hair still on your shoulders.

Then you get it back

We hone it to line the edge up straight, wipe it clean and hand it over.

That's it. No mailing it across the country. No waiting two weeks for your favorite knife to come home.

How to keep it sharp longer

A few easy habits and your knife stays sharp a lot longer:

• Use a wood or plastic cutting board. Glass, granite and plates are knife killers.
• Hand wash it. The dishwasher bangs it around with the forks. The forks win.
• Hone it now and then. A few light swipes on a steel lines the edge back up. Here's how.
• Don't use it as a crowbar. Looking at you, Gary.

Even with all that, a knife you use every day needs a real sharpening every so often. When a ripe tomato starts to squish instead of slice, it's time.

Get yours sharpened

• We come to you: book an at-home visit for $35 plus $8 a knife. We sharpen right in your driveway.
• Drop them off: 2809 Justin Rd, Unit A/B, Flower Mound, TX 75028, Monday to Friday, 7 to 4. $8 a knife, ready the next business day. More on drop-off here.

Kitchen shears and household scissors too. (Details.) Serrated bread knife? Here's what we can do.

Bring the whole block. Yes, even the one you used on the paint can.

Restaurants: get startedHome cooks: book sharpening