How to sharpen a lawn mower blade yourself

Before removing an element that requires sharpening, you should secure yourself and the device itself. If it is electrical, it will be enough to unplug it. For a gasoline-powered unit, you need to perform some actions beforehand:

  • Remove the spark plug cap from the spark plug;
  • prevent leakage. you can shut off the fuel tap or drain the fuel;
  • flip the unit to the side of the handle (rarely, but the instructions may specify another action, then follow it);
  • Take care to block the shaft of rotation by placing a block against the ground under the blade;
  • unscrew the locking elements that hold the blade, counterclockwise.

sharpen, lawn, mower, blade, yourself

If you cannot free the cutter at once, you should soften the threaded joint so as not to damage the edges of the bolt or wrench. This can be done with oil or grease. Then wait a few hours.

Lawn mower blade sharpening overview

Remove the spark plug wire from the spark plug to prevent accidental starting of the engine. Secure it so it doesn’t come back into contact with the spark plug.

One of the best ways to have the greenest, fullest, and healthiest lawn. sharpening lawn mower blades.

Dull blades tear and pull grass, leaving jagged cuts that weaken the plant and promote the growth of fungi and other grass diseases. The sharp blade, on the other hand, cuts gently, allowing the plant to heal and recover quickly. A sharpened lawn mower blade also allows you to do the job of cutting the lawn faster and with less stress on the mower.

Sharpening lawn mower blades. A simple task even for the novice mower operator. Sharpening a blade several times is enough to master the technique. After that, the chore takes no more than 10 minutes. Plan to do this twice per mowing season. Here we show you the steps of a lawn mower blade sharpening technique that will work for almost any lawn mower. Different lawnmowers have different methods of attachment blades and require different methods of removing the blade, which we will not show here. Read on to learn how to sharpen your mower blade.

Be careful when removing the blade

We recommend always removing the spark plug when you’re working with the blade. If the piston ends up at the top of the compression stroke, a small bump on the blade can force the piston over the “hump” and into the working stroke. If that happens, the blade might just break your hand!

In this case, look for the carburetor and air filter. The carburetor is usually easy to recognize because the throttle cables are connected to it. If you lift this side up when you tip the mower to get to the blade, you won’t get a cloud of smoke from the oil leak the next time you start. Some lawn mowers have gas caps with air holes that can cause small amounts of gasoline to leak onto your garage floor, so work outside or keep a rag handy to remove drips. After the blade is removed, put the mower back on all four wheels until you are ready to reinstall the blade.

You will usually find one bolt or nut holding the blade. The tightening is usually very tight, and you need to clamp the blade to loosen it. The 50×100 bar method we show is simple, quick, and safe. Do not use your foot! A good tool to loosen the bolt is a jumper or a wrench with a long handle with a socket that fits the bolt. This will give you plenty of leverage to loosen very tight bolts, and you can keep your fingers away from the blade when lowering. Use a drop of penetrating oil on really rusty, stuck bolts. Wait 10 minutes to give it time to soak.

Mark your new blade

Mark the blade with spray paint before you remove it so you know how to reinstall it. Mower repair professionals say the biggest mistake homeowners make is putting the blade upside down after sharpening. Blade won’t cut. and they’ll go crazy trying to figure out why!

Tip: Keep a second blade handy. The magazine will probably be closed when you need it!

Sharpen the blade with a file

Secure the blade in a vise and sharpen the cutting edge with a personal lawnmower blade file, holding the file at the same cutting angle as before. Sharpen until the blade is sharp.

After you remove the blade, inspect it to determine if it needs to be sharpened or replaced. We recommend that you sharpen it with a hand file. Mower blades are made of pretty soft steel. You can sharpen a blade in as few as 50 passes with a clean, sharp, personal file that is at least 10 inches long. Grinders are also good and work much faster. (Professionals use them.) But they are harder to handle, and you can overheat and ruin the blade.

Always sharpen the top side of the cutting edge; this will give you the longest edge of the blade. The file only cuts in one direction, when pushed. You will feel it cutting into the steel on the blade. If you don’t feel this action when sharpening, your file is probably greasy, or you’re not pushing hard enough. Don’t try to make the blade as sharp as a razor, it will take a long time. A “butter knife” in sharpness will do the trick.

Sharpening mulching blades is sometimes more difficult. Mulching blades may have longer or curved cutting edges, and you may need several types of files to sharpen them. In some cases, you may have to resort to an angle grinder to sharpen your mulch blades. If your mulch knife is too hard to sharpen, take it to a hardware store or knife sharpening service.

Balancing before installing

Hang the blade on a nail to check the weights. If one side goes down, file a little where the blade doesn’t work.

Be sure to balance the blade before installing it. An unbalanced blade will cause vibration and possibly destroy the blade shaft or bearings. To check the balance, simply insert a nail into the wall and place the blade on it, like an airplane propeller. If one side falls, it is heavier and you have to remove more metal there. Check the balance until the blade remains level.

Reinstall the blade and tighten the bolt by hand. Insert the bar in the opposite direction so that you can press against the switch to tighten the bolt. It is difficult to overtighten the bolt. Mower repair experts say the second most common mistake they see. is a loose bolt. A loose blade disrupts engine timing and sometimes makes it difficult to start the engine.

No excuses

To get used to keeping your blade sharp, allocate a set of sharpening tools for this purpose. Hang them side by side so they are ready to go. And keep the second, sharp blade. You can put it on and sharpen the blunt later.

Buying a new blade

Always replace the blade with the same replacement blade or the blade recommended in the owner’s manual. Resist the temptation to turn your regular straight-blade mower into a mulching mower by simply replacing the blade. Chances are your mower won’t work the same way it used to, and may not work at all. The space on a straight mower is shallow and has a side outlet to quickly push out grass clippings. The mulching mower has a deeper recess, no side discharge; the grass is sliced three or four times before it falls to the ground. The design of the mower is as important as the blade.

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You need a new blade?

Examine your blade when you remove it and look at the problems identified. If you are unsure of the condition of the blade, go to a store or home center and compare it to a new one.

Necessary tools for this project

Have the necessary tools for this DIY project that you need to have before you start. You save time and frustration.

File Rags Wrench set Vise Candle wrench

Materials needed for this project

Avoid making last-minute purchases by having all your materials prepared in advance. Here is the list.

Blade sharpening

The purpose of the sharpening itself is to eliminate fine chipping of the edge and bring the descent into one straight plane. The presence of a “file” on the blade leads to a rapid decrease in sharpness, and with a rounded trigger, there is too much impact on the cut stems. Also, a blade with a rounded shape gets dirty much faster.

It is better to sharpen the blade with a flat sanding stone with about 400-600 grit, more “delicate” stones do not make much sense. Soak the blade in soapy water for 10-15 minutes and periodically wet it during sharpening. The knife is also sharpened on grain with slight pulling of the bar from the center of the sharpened area to the edge.

When sharpening, try to maintain the same stone position in order to keep a constant angle. As with derailing, sharpening should be carried out with the condition that an equal amount of metal is removed on the opposite blades. This condition, however, does not have to be strictly observed for sharpening four-blade knives.

How to sharpen a lawn mower blade.

Decreased quality of grass cuttings when using a lawn mower is in most cases a sign that the tool blade is blunt and needs to be sharpened or replaced. At first glance it may seem easier to replace a blunt tool. buy a blade for a lawnmower. But that costs money, and finding the right knife configuration can be quite difficult. This option is only justified if the cutting edges are significantly damaged or if the blade is damaged when hitting a hard obstacle, e.g. a stone.

Most often, restoring the functionality of the knife is simple enough. to sharpen the lawn mower knife with their own hands.Anyone can sharpen a lawn mower blade or replace it by themselves, with a basic skill in working with hand tools.Please note that sharpening technology depends on the type of blade installed on the mower. Two types of machines are used to work on the lawn. lawn mowers with rotary blade and cylinder lawn mowers. Let us describe the process of knife sharpening for each knife type separately.

Sharpening of rotary lawnmower blade.

Gasoline lawnmowers; Electric lawnmowers. corded and cordless.

In their equipment are used mostly double-blade knives, less often a knife with four blades. Grinding methods are the same for all types and do not have any differences.

Work gloves; socket wrench or socket wrench of appropriate size; file set, grit block, or electric sharpening tool.

Before you start sharpening the mower blade, you need to perform a few preliminary operations:

Prepare lawn mower for blade removal. Especially the owners of gasoline models of lawnmowers should be especially attentive to this step. You may need to drain the fuel, oil; Turn the mower upside down to access the cutting tool; Secure the blade with a wooden bar; Using the right tool, usually a socket or ring spanner, unscrew the blade fasteners; Remove the blade itself.

How to Sharpen Lawn Mower Blades | Tutorial from Gardening Products Review

After cleaning the knife from adhered grass, dirt, you can proceed directly to sharpening.

For sharpening the blade you will need a stable base, a table or workbench on which you can comfortably place and fix the blade for the final sharpening. An optimal variant is if you have a possibility to fix the knife in a vice.

When doing the job, note that the working part of the blade is hardened, you should try to minimize the impact on the blade and keep the angle of the mower blade sharpened.

If the working parts of the blade have no damage. burrs, nicks. then you can limit the dressing of the blade. You can use an abrasive stone or diamond file for this. It is not necessary to remove a lot of metal and a “fine” tool is sufficient.

If the blade is damaged it must be removed with a coarse file, an emery wheel or an electric tool with an abrasive tip before sharpening.

If you carry out the work with a file or emery board, sharpening should be done from the middle of the mower blade towards the edge. The movement of the tool is “away from you”. After sharpening, check that the mower blade is not out of balance.

The sharpened blade can be mounted on the mower and you can start cutting the lawn.

Sharpening the blade of the spindle mower.

Drum ( spindle ) lawn mowers are equipped with a knife block. formed by a drum with several curved blades and a fixed straight blade. It might seem that it is very difficult to sharpen such a knife, but it is not so. You do not even have to remove the spindle.

To sharpen the spindle knife you will need abrasive. sandpaper, preferably waterproof.

You have to cut a strip of paper 1-2 mm wider than the width of the fixed blade and stick it on the fixed blade of the mower with double-sided adhesive tape, with the abrasive on the top side.

After that, actuate the blade drive. Hand cylinder lawnmower. roll it on a flat hard surface several times, if you have an electric cylinder mower then plug it in, turn it on and let it work for a short time, 1 minute is enough.

Don’t forget to remove sandpaper from the stationary blade before using the mower.

As you can see, sharpening the blade of any lawn mower is not that difficult and the job is within the power of every owner of this type of garden equipment.

How to sharpen a lawn mower blade keep the blade always sharp!

The time will soon come when you’ll have to mow your lawn on a regular basis. A sharp mower blade works much better than a blunt and serrated blade. This blade is freshly sharpened. The contrast of light and shadow closer to the end of the blade, shows well the fresh sharpening in this photo.

How to sharpen lawn mower blades

Dull lawn mower blades can be easily sharpened with an abrasive block or file, but severely damaged blades should be sharpened on a bench grinder. Store service can do this for you or tell you when it’s time to change your mower blade.

A mower blade that’s scored, dented, or deburred from hitting rocks and branches is not good for your lawn. A blunt blade tears the grass instead of cutting it cleanly, making it more susceptible to disease. To sharpen a blade that’s in pretty good condition, just clamp it in a vise every couple of weeks, and use a jackhammer to drive along the cutting edge, making sure your angle matches that of the factory bevel. (Always disconnect the spark plug wires before removing the lawn mower blade or doing any of the maintenance on the mower.)

If the blade of the lawnmower blade is seriously damaged, it must be sharpened on the grinder stand or may need to be replaced. The store can sharpen it for you or offer you a new blade. But if you have your own grinder, this is easy to sharpen with your own hands.

Start by running the blade of the lawnmower blade back and forth, straight at the cutting edge and perpendicular to the abrasive disc to remove any dents and dings. This will give you a blunt but straight edge. Then, using the backing plates, holding the blade at the angle of the existing chamfer, start chamfering the blade until you get a sharp edge.

Finally, check to make sure the blade is balanced: a lawn mower knife with an imbalanced blade, can damage its. This can be done at a repair shop or lawn care service. But you can also do the balancing on your own by placing the blade on the balancer and look at. If one side goes down, you need to remove some steel from that end (but not from the cutting edge!) to lighten it up. After the blade is balanced, screw the lawnmower blade back on, and you’re ready to step into the tall grass.

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Lawnmower Blade Sharpener

After removing all kinds of junk like greenhouses, beds, slate, boards, bricks and other debris, I realized that the best thing is to level everything and sow grass.

But the grass needs to be mowed regularly, and a lot of it is not mowed by trimmers with fishing lines, but by these lawn mower carts with metal blades:

And these mowers’ blades need regular sharpening, because otherwise they won’t cut properly and will damage the grass, i.e.к. Will not cut it, but knock it down.

I used to sharpen the knife with just a flat rock on the Dremel:

It wasn’t very convenient, and I couldn’t keep the factory sharpening angle.

And decided to buy such sharpening stones, and try.

In our stores, I found no such stores, although there are similar sharpener with a limiter for other blades, but not for mowers.

But there are a lot of different ones out there, called the Lawnmower Blade Sharpener.

This sharpening stone is made at just the right angle for sharpening lawn mower knife blades, and it has a plastic stop on the other side that keeps the stone on the blade.

I have two blades. one is a finishing blade, for good grass sown on a leveled site, and the other is a rough beaten blade. for mowing in an as yet undeveloped area, where a stone, root, bump may come across and damage the knife.

On a good lawn, the blade will barely blunt, but I have sharpened a rough blade many times. it blunts quickly on bumps, and there are nicks and irregularities on it.

So I decided to try it on him first! )

The stone has the right angle on it, and I sharpened at an arbitrary and wrong angle, so the stone and blade don’t match:

The light is the new sharpening, the dark is the old cutting edge.

It takes a long time to turn. I spent 10 minutes on each side.

Well also because of the lack of experience. until you understand how to hold it correctly, the circle jumps on the blade.

As Leah said in the video, you have to hold the plastic stop against the blade so it doesn’t bounce.

At the very edge is difficult at all, and I took a two-handed drill instead of an electric screwdriver to make it easier to hold:

A small disadvantage. the stone can’t reach all the way to the edge of the blade on the side where the cutting edge ends and the stone rests against the thick ledge on the knife:

I have not sharpened it yet, so the sharpening angle is exactly the same as the stone:

Proper sharpening is very easy and quick. I spent 1 minute on each side.

If you keep an eye on the blade, and sharpen it regularly, it will take very little time.

How To Sharpen A Lawnmower Blade Yourself

In general it is really a handy thing! If you have a lawnmower, I suggest you give it a try.

How to remove the mower blade

First you need to prepare the mower. If it’s an electric model, just unplug it and lay it on its side. If the model is gasoline, you need to perform a number of actions:

  • Remove the grass catcher box.
  • Carefully drain fuel and oil into separate containers (oil leaks can cause starting problems).
  • Disconnect the spark plugs to prevent accidental contact.
  • Lay the mower on its side.
  • With a log or a scrap of board fix the blade, so it does not turn. Be careful not to cut yourself.
  • The blade can be attached with 2 bolts or 1 large bolt in the middle. For unscrewing use a ring spanner or socket wrench (it’s easier to tear off the edges with a pair of pliers). The threads are usually right, i.e. unscrewing should be done in a counterclockwise direction.

The question regularly arises how to remove the blade from an Al-ko or Bosch Rotak lawnmower. There are no fundamental differences between these models. It’s just that the factory torque is very tight. Sometimes the bolts get stuck. In such cases, helps liquid wrench WD-40.

Lawn mowers, like any other cutting equipment, are equipped with blades that cut plants. When used, they tend to blunt, and then the work of the mower becomes laborious and excruciating for the operator working with this technique. Sharpening mower blades is much cheaper than buying new mower blades.

Low in one of the oldest sharpening workshops in Moscow

Lawn mower blades can be sharpened many times, removing the minimum necessary layer of metal with the right sharpening equipment.

Sharpening of lawn mower blades in our company costs 250 p.

We sharpen both tools and knives, including ceramic ones.

The electric motor is powered by electricity and has a limited radius of operation and depends on the length of the wire. Allows the operator to work only in dry weather to avoid electric shock. It is always necessary to pay close attention to the fact that the cable is not cut accidentally, because the blades are very sharp and rotate at high speed.

Lawn mowers with petrol engine are the most mobile. They don’t have a limited operating radius and electric shock won’t happen. The main thing here is. the inclination angle of the mower is correct, so the fuel flows evenly into the engine, it should not exceed 30 degrees. When mowing steep slopes, you must carefully assess the surface of the slide to be mowed to protect the motor as much as possible from damage.

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  • The approximate price is 200
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  • The approximate price 250
  • Approximate price 250
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  • The approximate price 300
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The blades of the blades of various lawn mowers are almost always made of high-quality steel, but despite this, they still need to be sharpened periodically. And most importantly. do it in a way that does not degrade the quality of the metal. However, no special tools and skills are required for this, and any dacha farmer will easily be able to cope with such a task!

Why sharpen lawn mower blades?

Of course, cutting the excess lush green grass from your favorite lawn is quite realistic with a blade with blunted edges. But the grass as a result of such manipulations will begin to stratify (this stratification will go mainly in the longitudinal direction), gradually turning into a messy fringe. And after a few days, it is even withered, and can even be sick for a few weeks. That’s why the cuts should always be neat and tidy. Here they are tightened in a few hours and allow you to maintain a spectacular succulent green color of your lawn. And to make sure they are, you need to periodically sharpen the blades of the mowers you use!

Removing the blade

Before embarking on such an important undertaking, it is important to try to secure both yourself and the garden gadget as much as possible. This is especially true for petrol lawnmowers (electric models can easily be defused by simply unplugging them): First you have to unplug the spark plug and then you have to stop any fuel leakage. There are two ways to do this. both by draining the tank and by putting a rubber leakproof membrane under the cap and blocking the fuel tap. Unless the instructions state otherwise, only turn the mower upside down in the direction of the handle. And before you do this, you should squeeze the hose that is intended for the exhaust of the crankcase gases. it will help to avoid oil leakage.

The blades in different models of lawnmowers can have a variety of configurations, but the threads on the bolts are always unscrewed in the same way. counterclockwise. And to prevent possible rotation of the shaft, you can place a block firmly in the ground under the knife. And of course, in order not to get anything wrong when putting the knife back, it is important to try to memorize or even sketch the position of the blades.

What to do next?

The removed knife must be necessarily cleaned from hardened herbal sap and also from the dirt stuck on it. The easiest way to do it is to use a metal pencil. Then the surface of the blade is examined for any bumps or humps. If there are any, they are straightened out with an ordinary hammer with slightly rounded edges of the striker. As a rule, you start to dress the blade from the edges of the curved area, gradually moving towards the center. It also does not hurt to check and often unbendable from the impact throwing blades, because if they bend at different angles, it will inevitably lead to a deterioration in air flow, resulting in the cut grass will not properly mulch.

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The next step. removal of the descent. First, you get rid of chipped areas by bringing the edge of the blade at a uniform angle along the entire length of the cutting part. And to display the descent at the desired angle you will help a small file or an electric tool equipped with a carborundum stone. It is important to try to remove metal from the blade as evenly as possible. But an angle grinder for these purposes is categorically not recommended, because it can significantly reduce the quality of the sharpened blade.

sharpening the blade

For sharpening the blade, usually use a flat emery bar, which has a grain size in the range of 400 to 600 grits. Before you get down to sharpening the blade, it is recommended to soak the bar for about ten or fifteen minutes in soapy water. Periodically during the sharpening process this manipulation should be repeated. And you sharpen the blade by pulling the bar in the direction from the center of the area to be sharpened to its edge. It is desirable for the stone to be in the same position. This will help to keep the angle constant. And, of course, an equal amount of metal should ideally be milled off the blade!

How to Sharpen a Lawn Mower Blade | This Old House

Sharpened blades must also be “corrected”. you need a small piece of wet sandpaper, which grit size is between 600 and 800 grits. The paper is moistened with water and rolled into a cylinder, the diameter of which reaches about 100. 150 millimeters and only after that “straightening” is performed. And before putting the blade back on the lawnmower, it is important to make sure that the weight of its shoulders remains the same, otherwise (in case of imbalance) can cause a highly undesirable vibration. To check the balance, they first clamp a smooth bar horizontally in a vice and then put a blade over it through the hole in the middle and try to set it horizontally, too, watching how it behaves. one shoulder should not visibly overtighten the other. If the balance is not maintained, a little more metal is removed from one of the arms of the coil. Only then can the sharpened blade be placed back on the mower!

When working with a lawn mower, it is usually a sign that the tool blade has become dull and either needs to be sharpened or replaced. At first glance it might seem that it is easier to change a blunt tool. to buy a blade for a lawnmower. But this is associated with the costs, well, to find a knife suitable configuration may be quite difficult. This option is justified only in the event of considerable damage to the cutting edges or when the blade is damaged by a hard obstacle, e.g. a stone.

In most cases, it is quite easy to get the blade back to work. to sharpen the lawnmower blade with your own hands.Everyone can sharpen the lawnmower blade or replace it independently, basic skills of working with hand tools will suffice for this.Please note that the sharpening technology depends on the type of blade installed on the mower. Two types of equipment are used to work on the lawn. lawn mowers with a rotary blade and lawn mowers with a drum. Let us describe the process of sharpening each type of blade separately.

Sharpening a rotary lawnmower blade.

Gasoline lawnmowers; Electric lawnmowers. corded and cordless.

In their equipment are used mostly double-blade knives, less often a knife with four blades. Sharpening procedure for all types is the same and does not have any differences.

Working gloves; Socket wrench or socket wrench of appropriate size; A set of files, an abrasive block, or an electric sharpening tool.

Before you start sharpening the mower blade, you need to perform a few preliminary operations:

Prepare the mower for the removal of the knife. Owners of gasoline mower models need to be especially attentive to this step. You may need to drain the fuel, oil;

Grinding a lawn mower blade with your own hands

Working edge of the knife was damaged by stones. Т.к. We do not have a sharpening machine with guides

How to sharpen a lawn mower blade.

How to sharpen a lawn mower blade with your own hands To ensure that the mower cuts the grass evenly and does not squeeze it, the blade should be at least once Turn the mower over to access to the cutting tool; Fix the blade with a wooden bar; Using a special tool, usually a socket or ring spanner, unscrew the elements that hold the blade; Remove the blade itself

After cleaning the knife from the grass, dirt and other debris, you can start sharpening.

To sharpen the lawnmower blade you will need a stable base. table or workbench, on the surface of which you can comfortably position and fix the knife for the final sharpening. If you have the opportunity to clamp the blade in a vice, this is the best way to do it.

Please note that the working part of the blade is hardened, so care must be taken to keep the cutting edge angle of the mower blade as small as possible.

If working parts of the knife do not have any damage, such as burrs, nicks, you may limit yourself to straightening the blade. You can use an emery stone or diamond file for this. You do not need to remove a lot of metal, and you can get by with “thin” tools.

If the knife blades are damaged, they must be removed with a coarse file, an emery wheel or an electric tool with an abrasive nozzle before sharpening.

If you carry out the work with a file or an emery bar, the sharpening is carried out from the center of the mower blade towards the edge. The movement of the tool is “away from you. After carrying out the work it is necessary to check that the balance of the mower blade has not changed.

The sharpened blade can be mounted on the mower and you can start mowing the lawn.

Sharpening the blade of the spindle mower.

Drum (spindle) lawnmowers are equipped with a knife block. formed by a drum, in which several curved blades and a fixed straight blade are installed. It may seem that it is very difficult to sharpen such a knife, but it is not so. You don’t even have to remove the spindle.

To sharpen the spindle blade you will need an abrasive. sandpaper, preferably waterproof.

Cut a strip of paper 1-2mm wider than the width of the fixed blade and stick it on the fixed mower blade with double sided adhesive tape, with the abrasive material on top.

Then set the blade drive in motion. Manual cylinder lawnmower. to roll on a flat hard surface several times, if you have an electric cylinder mower then connect it to the network, turn it on and let it work for a short time, 1 minute is enough.

Remember to remove sandpaper from the fixed blade before using the mower.

As you can see, to sharpen the knife of any lawnmower is not so difficult and perform this work on the power of every owner of this type of garden equipment.

A sloppy lawn right after mowing. is a sure sign that the mower’s blade is blunt. There can be two solutions: sharpen the knife yourself or take it to the service. Let’s start with the first option.

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