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How to Sharpen Tools

There's no technical mystery to sharpening garden tools like your lawn mower blades, ax and shovel. In this article, we'll show you step-by-step methods to file and hone an axe using a sharpening stone, how to sharpen a shovel and the best way to sharpen your mower blades.

By the DIY experts of The Family Handyman Magazine

Sharpening your tools

Years ago, I drove by a storefront with a hand-painted plywood sign. It read “Tool Sharpening.” Curious, I gathered a boxful of dull old handsaws and circular saw blades in my garage and carried them up to the store with the hope of getting them sharpened.

Inside I saw a lean old fellow with wisps of gray hair curling from the backside of an old hunting cap. He was hunched over his vise illuminated by a single 150-watt bulb hanging from the 12-ft. ceiling. There were tools everywhere in the shop and boxes with layers of dust several years in the making. I interrupted him in mid-stroke of filing an ax by saying I had some blades to drop off to get sharpened. He told me to leave them by the door, write my name on the box, and come back in a week. I felt uneasy about his apparent lack of concern for my stuff, but I thought I’d chance it and see what happened.

A week later when I walked into the store, he asked me what my name was and started rummaging through a pile of bags and boxes. Magically, he found my box in the midst of the clutter and handed it to me along with a modest bill. I paid him and took the tools home. The handsaw cut through a 2x4 as if it was butter, and the circular saws were equally impressive!

The next day I gathered my garden tools and brought them down to the same shop. As I entered the store, he said, “I can’t do those for you.” I asked him why and he explained that the building was just sold to a coffee shop and he’d be closing his doors for good. “I’m retiring, going fishing,” he said. I asked him where I could take the tools, but he had no suggestions.

A moment passed, then he looked me in the eye and said, “Why don’t you do it yourself?” I shrugged my shoulders as he motioned me to come around the counter with my box of garden tools. He proceeded to pull each tool from the box and explain how to sharpen them. For the next two hours he stood over my shoulder as I ground and filed each tool.

That afternoon changed forever how I look at tools. As small shops like his disappear from the urban landscape, I’m thankful for the confidence this guy instilled in me, and I try to emulate the skill he used in handling the edges of tools. Don’t get me wrong—I still send out my handsaws and circular saws to a big sharpening business in the next town—but lawn tools take less time to sharpen than the drive there. You can also apply the same techniques to hoes, hatchets and mauls.

Do It All with Three Simple Tools

A Grinding Wheel, a Mill File and a Sharpening Stone
You can sharpen most garden tools with a simple 10-in. mill bastard file (Photo 5). A synthetic finishing stone will further smooth the blade edge, which is important, especially on an ax or hatchet. You can get one at any hardware store. You don’t need a fancy Arkansas stone for garden tools.

A grinding wheel (shown in Photo 4) is good only for removing larger amounts of steel. Grinding is a better choice than filing if you have to get rid of nicks in the blade, or you’re trying to restore an especially worn blade. One strike against the grinder is that it may get the blade so hot that the temper (built-in hardness) of the steel could be ruined. If the steel turns a straw color, it’s done for. If you must use a grinder, keep a bucket of water handy to douse and cool the blade after every pass across the wheel. With practice, you’ll know how much grinding an edge can take before it gets too hot. For most of the grinding shown here, a coarse wheel will work fine.

You can buy all these sharpening tools at home centers and hardware stores.

Lawn mower blades: Sharpen and balance

The last time I tipped my mower on its side to remove the blade, I couldn’t get it started again. A piece of dirt got lodged in the carburetor needle valve, and I had to remove the whole carburetor and clean it to get it going.

Another reason not to tip it on its side is you won’t have to deal with spilled gasoline. The best way to do it? Set your lawn mower on top of sawhorses to get at the blade.

Although it’s unlikely, the engine could start if you rotate the blade, so pull the spark plug wire before touching the blade. Once you remove the blade (Photos 1 and 2), you’ll notice an edge about 3 in. long on each end of the blade. These are the edges you’ll be sharpening.

Video: How to Sharpen a Lawn Mower Blade

A sharp lawn mower blade will help keep your grass healthy. Jeff Gorton, an editor at The Family Handyman, will show you how to sharpen a lawn mower blade so you can keep your lawn in great shape.

 
Caution!

Never wear gloves, neckties or shirts with loose sleeves around a spinning grinder. Also, keep long hair tied up or tucked under a hat. Although the heat of the sparks isn't intense, keep your hands clear of the direct spray of sparks from the grinder.

Axes: File and hone

Not all axes have the same blade bevel, so it’s important to follow the original bevel. Inspect the ax blade for any chips or nicks. If you find some nicks, grind them away  with the grinder. Do the whole edge to preserve the shape of the blade. You must be careful not to burn the edge. Keep a bucket of water handy to douse the head after each pass, then dry it off and continue grinding.

If your blade has only small nicks or irregularities, you can usually file them away with a 10-in. mill bastard file. Filing produces very little heat, so you won’t need to worry about ruining the temper of the blade. Follow Photos 8 and 9 to get a blade as sharp as a pocketknife. If you have any visions of shaving with your ax like the lumberjacks of folklore, forget it. It’ll be sharp, but not that sharp.

Shovels: 20 strokes with a file

Sharpening a shovel is one of those things most people don’t think of doing, like cleaning the coils of a refrigerator. Once your shovel is sharp, the task of digging almost becomes fun. Along with sliding easily through soil, it’ll cut right through stubborn roots and sod.

In most cases, you’ll only need a file to sharpen a shovel, but if the edge has some chips or deep nicks, use the grinder first to reshape the edge, then file as shown in Photo 10. Once the shovel is sharp, don’t worry about the burrs you’ve created on the backside; they’ll disappear the minute you start digging.

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Required Tools for this Project

Have the necessary tools for this DIY project lined up before you start—you’ll save time and frustration.

    • Clamps
    • File
    • Grinder
    • Hearing protection
    • Safety glasses

A 10 in. mill file works great for filing blades and tools and you'll also need a sharpening stone.

Required Materials for this Project

Avoid last-minute shopping trips by having all your materials ready ahead of time. Here's a list.

    • Honing oil

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