Sharpening a Spade With an Angle Grinder

Updated on April 7, 2020
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Eugene is an avid gardener and has been passionate about growing things for over 40 years. He also has a keen interest in DIY.


How to Sharpen a Spade

Sharp tools make work easier because less effort is required to use them. While sharp tools are dangerous if you don't take care, blunt tools can also be dangerous as you tend to apply a lot more force when using them to cut materials, possibly leading to an accident if the tool slips. This short article shows you how to sharpen your garden spade with an angle grinder. A sharp spade makes it much easier to dig, slice the sod off the top of a lawn, edge flower beds, cut through roots when digging and slice through the top growth of weeds.

Can a Sharpening Stone Be Used to Put an Edge on a Spade?

For sure, but an angle grinder is quicker. Normally a sharpening stone or file is used to sharpen tools which require a fine edge e.g. a hedge trimmer/shears or knife. While you can use a sharpening stone or file to sharpen a spade, it takes more time, especially since the edge on a spade can become quite blunt and rounded after a season's digging, chopping roots, etc. The edge on a spade doesn't need to be quite so sharp as that on a knife and an angle grinder is perfectly adequate for the job. The only thing you need to do is take care and avoid overheating the edge of the tool, which can cause the steel to lose its temper or hardness (this is where the expression comes from)

Step 1: Hold the Tool Securely

You can use a vise, rest it on a block on the ground, on a stool or whatever. I'm using a log in the video.

Make sure you're using a grinding disk, not a cutting disk!
Make sure you're using a grinding disk, not a cutting disk! | Source


Don't Forget to Wear Eye Protection!

Only use a grinding disk. Cutting disks are thinner and may shatter if you subject them to excessive side pressure.

Check the expiry date on the disk.

Step 2: Start Up the Grinder

A grinding disk can usually be recognized because it is quite thick, nearly 1/4 inch.

Since this is only going to take less than a minute, you don't need all the normal safety clothing used when working with a grinder such as hearing protection or a dust mask. Eye protection is always essential though, because of the danger of disk fragments, sparks or splinters of metal hitting you in the eyes. Make sure you don't have any loose clothing which can get caught in the disk. See this hub for safety guidelines when using an angle grinder:

Using an Angle Grinder Safely

Switch on the grinder, if it has adjustable speed, use a slow speed setting. Now use a series of sweeps across the blade to sharpen it. The angle between the plane of the disk and the plane of the blade should be about 30 degrees. Keep the grinder moving, use light pressure and don't allow the disk to rest at any one point as this will overheat the steel and cause it to lose its temper. If tempering colors appear on the edge, typically blue, yellow and orange (caused by oxidation of surface layers), you're applying too much pressure.

Rest the spade on a log or block, or hold it in a vise
Rest the spade on a log or block, or hold it in a vise | Source
Place your foot on the spade to steady it. Angle the grinder at about 30 degrees to the plane of the blade
Place your foot on the spade to steady it. Angle the grinder at about 30 degrees to the plane of the blade | Source
The disk should turn away from the edge
The disk should turn away from the edge | Source

Sharpening a Spade With an Angle Grinder

Can a Bench Grinder Be Used?

Yes it can. However personally I find an angle grinder more convenient. Also disks for angle grinders are much cheaper to replace when they wear than grinding wheels for bench grinders.

Recommended Grinders from Amazon

This G12SR4 Hitachi model from Amazon is rated at 6.2 amp / 120 volts (744 watt). This is a good general purpose grinder, adequate for cutting and grinding most stuff around the home (this is the latest version of the grinder I use in the photos). You can also use it with a wire brush for de-rusting and removing paint. Higher powered versions are available up to 1000 watts from this advertiser for quicker cutting through heavier material.

What Other Garden Tools Can be Sharpened This Way?

A hoe will also benefit from a sharpening, allowing you to slice through the roots of weeds. You can also remove any nicks or dents from the blade of an axe by grinding. Use the same technique as when sharpening a spade, but sharpen both sides of the edge. You can grind a lawn mower blade to remove dents caused by stones before using a sharpening stone to make it razor sharp. Don't remove too much material because it will unbalance the blade. Take a look at Lawn Mower Blade Sharpening for the Homeowner.

Most other home and garden tools such as knives, scissors, hedge shears and chisels which require a finer edge should be sharpened with a sharpening stone. Diamond sharpeners are also available. These are flat plastic and metal plates coated with powdered diamonds. They are quite good but the coating does eventually wear away.

Axes can also be sharpened with a grinder. Grind both sides of the blade at about 30 degrees - Finish off with a sharpening stone
Axes can also be sharpened with a grinder. Grind both sides of the blade at about 30 degrees - Finish off with a sharpening stone | Source
......and you can sharpen your hoe. Just sharpen the side facing you
......and you can sharpen your hoe. Just sharpen the side facing you | Source

Safety Shoes Aren't Just for Construction Workers!

If you're working in the garden, it's a good idea to wear safety shoes or boots. These have a steel toe cap and insert in the sole which helps to protect your feet from glass, metal, nails or other hidden nasty stuff when working in an overgrown area.

Safety shoes
Safety shoes | Source

This article is accurate and true to the best of the author’s knowledge. Content is for informational or entertainment purposes only and does not substitute for personal counsel or professional advice in business, financial, legal, or technical matters.


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    • profile image

      lupi johnson 

      2 years ago

      can I put mulch then plastic then rocks to stop the weeds in my rosegarden?

    • tirelesstraveler profile image

      Judy Specht 

      6 years ago from California

      Duh, why didn't I think of sharpening the tools. Dad used to do it when he visited. Excellent. I think we even had an angel grinder.


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