How to Sharpen Loppers—and Why You Should
They're among the handiest tools for gardening and landscaping, but occasionally, lopper blades need sharpening to keep them working well.
Unlike garden shears, which are similar to scissors in design, loppers are designed for use with both hands, which allows the user to exert greater force for cutting large branches. When new, most garden loppers are razor-sharp and pruning requires only minimal exertion. However, with repeated use, even the best garden loppers can dull or develop nicks from cutting branches that are too hard. They can also become gunked up with tree saps that can reduce their cutting efficiency.
Don’t run out and buy a new pair of loppers for pruning shrubs and trees just because the blades are dulling. Instead, check out the following guide that will explain how to sharpen loppers and get years of additional use from the same pair.
The following materials and tools are suitable for sharpening garden shears and garden pruners, as well as garden loppers.
BEFORE YOU BEGIN
Sharpening lopping shears isn’t tricky, but it can be slightly messy due to the lubricant necessary to clean the blades. Rather than sharpening just one set of loppers and calling it a day, gather together your entire collection of pruning shears and loppers, and sharpen them all at the same time. This can be done anytime during the gardening season, but it’s imperative to clean and sharpen blades before storing garden tools over winter to help prevent rust and corrosion from developing.
STEP 1: Clean tree and plant sap from blades.
An essential first step when learning how to sharpen garden tools is figuring out how to clean away plant liquids without damaging the steel of the lopper blades. Washing the blades with soap and water is not the best course of action in this case because moisture can cause some types of steel to rust. The best way to clean the blades when sharpening shears, pruners, or loppers is to spray them with a bit of lubricant, such as WD-40, which quickly dissolves the gunk. Then, use 0000 steel wool to rub away the residue.
STEP 2: Sharpen with the angle of the bevel.
Loppers and pruners come with a sharpened blade edge that appears as an angled bevel when closely inspected. On a bypass lopper or pruner designed to cut soft green branches, such as those found on roses, only the outside of the top blade will be sharp. Use a sharpening stone or a carbide blade sharpener to re-sharpen the blade. Pass the sharpener over the bevel at the same angle as the original slant. This will ensure that the newly sharpened blade will cut smoothly when pruning branches.
STEP 3: Stroke from the pivot to the tip of the blade.
Newbies’ biggest mistake when learning how to sharpen garden shears, pruners, and loppers is to stroke the blades with the sharpener in a back and forth motion. This can create nicks and result in a rough edge. The best method is to stroke the blade from the pivot (where the blades join) to the tip in one smooth motion. After a few strokes, check the blade (carefully) for sharpness. Depending on how dull the blade was to begin with, it could take between 5 and 20 strokes to restore a sharp edge.
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STEP 4: Sharpen both sides of an anvil lopper blade.
Unlike bypass loppers that are sharp on only one side of the upper blade, anvil loppers feature a blade that’s sharp on both sides. Anvil loppers are made for cutting through hard, dead wood, and the double-sided blade is used to crush the branch rather than slice through it. When sharpening an anvil lopper, use the same pivot-to-tip strokes, but make them on both sides of the blade, following the same angle as the original bevel.
STEP 5: Finish by lubricating for protection.
All types of garden loppers and shears will benefit from spraying a tiny bit of lubricant on the blade and pivot area to help repel moisture and corrosion before storing. Use a soft shop cloth to spread the lubricant evenly and then wipe away excess. This quick, simple step will help protect the newly sharpened blade and keep the tool moving freely.
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