How To Sharpen Lawn Mower Blades With A Bench Grinder
If you follow the following steps, you should be able to sharpen your lawnmower blade in minutes and do the job safely.
1. Safety first – when removing the blade from your lawn mower there are two safety tips to use before you get started.
First, remove the spark plug from both an electric model and a gas-powered lawnmower. This prevents any accidental starts.
Second, keep the carburetor facing up when tipping your lawnmower. This action helps prevent oil and gas spills. By doing this you are keeping your work area a lot safer.
2. Removing the blade – even though the blade is dull, it can still cut skin. Make sure to wear a pair of gloves to protect your hands. Now you can hold the blade with your one gloved hand while the other hand is loosening the bolt. We do not recommend this procedure.
The best way to hold the blade still is to use a good-sized piece of 2 by 4 and jam it in between the blade and the lawn mower housing. This will keep your hand safe while holding the blade still as you unscrew the nut.
If you find that the nut is too tight, spray a little lubricant on it and let the oil sink in before trying again. As you remove the blade mark the bottom side of it. This will help you to put the blade back in correctly.
After inspecting the blade, you may find that it is too damaged to sharpen and buying a replacement is the best way to go. If you buy a replacement blade, make sure you know which side goes up and which side goes down.
How To Sharpen A Lawnmower Blade With A Cordless Drill
The cordless drill has an attachment that helps you to sharpen your lawnmower blade. That attachment is basically a sharpening stone and a plastic material packed together.You use this attachment on a drill and sharpen your blade.Plastic is basically called a guide that keeps the blade at the right angle when you touch it with an attachment drill.
First, wear eye protection and then turn on the drill.
Start moving drill on the blade edge such that the blade touches the sharpening stone, and the plastic guides the drill to move onto blade at right direction and angle.
After swiping a few times, seeing the shiny metal confirms that your lawnmower blade isnt dull anymore.
Check the balance and lawnmower blade, and you are good to go.
How to Sharpen Lawn Mower Blades With a Bench Grinder
Bench grinder makes short work of it. I personally prefer that to sharpen my mulching blades.
A bench grinder is simply a machine fixed to a wooden bench and has a sharpening disc.
- First, put on the eye protection.
- Now turn on the bench grinder and gently push the blade against the disk such that it sharpens it.
- Make sure that you sharpen it at a right angle and sharpen it from both sides to keep the balance.
Precautions During Sharpening Of A Lawnmower Blade
- Always use eye protection and gloves while sharpening a lawnmower blade. The chances of injury are quite low as 1% but wearing protection is a good practice.
- Always swipe the sharpening material on a lawnmower blade in a gentler way so it may not disturb the shape of the blade.
- Never place wood on any angle other than 90 degrees to restrict the blade movement when you unscrew the old blade.
- Make sure the mulching blade is tightened well on the vise so it may not fly away while sharpening it.
- Never use the tools to pull the spark plug wire, always pull it by hand.
- Always use the narrow file to sharpen the mulching blade as it is more efficient than the wider one.
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Accusharp Garden Tool Lawn Mower Blade Sharpener
AccuSharp specializes in developing knife and blade sharpeners to provide the sharpest edge for your tools. Whether your sharpening needs are in the kitchen, workshop, yard, hunting, or other outdoor sports, the brands sharpeners will help you maintain the best edge.
This is another versatile option that allows you to sharpen not just your lawn mower blade, but all single edged items in your toolshed. The blade is constructed from diamond-honed tungsten carbide which is one of the hardest known materials.
With its innovative performance, you can sharpen your lawn mower blade in approximately 10 seconds.
The sharpener features a reversible design that allows you to use both sides of the sharpener so that it lasts double its lifespan. Furthermore, it will not rust and you can clean it using a soap solution or in your dishwasher. With these features, the sharpener will last approximately for 5 to 10 years. The sharpener is equipped with an ergonomic handle that is suitable for both left and right-handed users. For your safety, the sharpener comes with a full length guard that protects your fingers during the sharpening process.
- Sharpens all single edged items
- Made from diamond-honed tungsten carbide
- Sharpens your lawn mower blade in ten seconds
- Both sides of the sharpener can be used
- Lasts for 5 to 10 years
- Ergonomic handle for right and left-handed users
- Full length guard for protection
Vevor Sharpener Wide Mower Bladesmower Blade For 7
- · DURABLE IRON MATERIAL- This lawnmower blade sharpener is made of high-quality iron metal material, so it is corrosion-resistant and rustproof for durability. It can quickly and easily sharpen mulching or standard lawnmower blades.
- · FOR 7-14 CM WIDE BLADES- The mower blade sharpener with a flapper wheel is suitable for grinding 7-14 cm wide blades. The crank arm is upgraded to connect by bearings to avoid angular deviation.
- · FLEXIBLE ARTICULATING ARM- The sharpener with unique design has a vice head to hold the mower blade and an articulating arm to attach the grinder. The arm holds the grinder and ensures the proper sharpening angle.
- · EASILY SET UP- This blade mower sharpener can be mounted to a bench top or held in a vice. The blades can be sharpened in a matter of seconds once the tool is set up. Blades can be sharpened in a matter of seconds once tool is set up.
- · CONVENIENT USE- The mower blade sharpeners are very important for the preparation of tip-top shape for the mowing seasons. And the blades are sharp enough that will amazingly cut and clean up the grass without damaging.
Don__ work very well0I recommend this item it is what I was looking for
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How To Sharpen The Lawn Mower Blade
Next, gather the tools to sharpen lawn mower blades. Mower blades have a 3- to 4-inch cutting edge on opposite sides of the blade. Check to see if the blade is dull or damaged.
- Clamp the mower blade into a vise or onto a worktable with the first cutting edge facing up.
- Examine the blade. Decide if it is better to sharpen it or replace it.
- If your blade has cracks, is missing large pieces, or is severely bent, replace it. You shouldnt sharpen a heavily damaged lawn mower blade.
- If your blade is just nicked, chipped, or dull, try sharpening it.
Lawnmower blade sharpening can be done several ways. You may already have some of the blade sharpening tools you need:
- Sharpening a lawn mower blade by hand uses metal files or abrasives.
- Sharpening a blade by machine uses a blade sharpener, bench grinder or angle grinder.
Only sharpen the blade so its as sharp as a butter knife. The edge shouldnt cut your finger. A razor-sharp blade dulls more quickly. Youd have to replace the blade more often after constant resharpening. A gently sharpened and shiny edge is the goal.
Safety Tip: Always wear gloves, long sleeves and eye protection when working with grinders and blades. Wear ear protection if youre using a machine method of sharpening.
Sharpen a Lawn Mower Blade by Hand:
Sharpen a Lawn Mower Blade with a Drill-Powered Blade Sharpener:
Sharpen a Lawn Mower Blade with an Angle Grinder:
Why Its Important To Sharpen Your Lawn Mower Blades
A dull lawn mower blade rips and pulls the grass blades, leaving ragged tears that both weaken the plant and promote fungal growth and other grass diseases. A sharp blade, on the other hand, cuts cleanly, allowing the plant to heal and recover quickly. A lawn mower blade sharpening also lets you complete your lawn-cutting chore faster and with less stress on the mower.
These steps will work for just about any walk-behind mower. Riding mowers require different blade removal techniques, which we dont show here. If youre having trouble with your lawnmower find out why your lawnmower wont start.
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Blade Setup And Sharpening Tools
Grip the blade in proper position with a vice grip to clamp it in a place for its sharpening. Ensure that blades cutting edge should face upwards. Also, look for any crack or dent to make is sharpening is a better option compared to replacing. Now get ready to sharpen the blade with any type of tool.
- Hand Sharpener
Keep the sharpener at the top of the blades cutting edge, and move the file in one direction with a grain. However, moving forth and back will damage the blade and sharpener as well. You feel protrusions on the blade if not applying the proper amount of pressure while moving the sharpener. Or else apply a little more force to keep the sharpener working over the blades perfect angled edge. Usually, it needs less than 50 file strokes to sharpen the blade. After smoothing all rough patches, you have to flip them to continue the same process on the other side.
- Drill-Powered Tool
- Angle Grinder
It is used by professionals to do the sharpening task efficiently and with ease. Simply clamp the blade as other methods, then set this grinder with a flap disc. Usually, several sets come with this part. The cutting edge of the mower blade is lined with the grinder blade. move the grinder back and forth with minimal pressure. Also, smooth the rough patches of the blades edge by tracing its angle.
S To Take Before Sharpening Your Lawn Mower Blades With A Blade Grinder
Step 1: Check the work area.
Make sure the grinder is properly supported on a flat and level work surface.
Step 2: Clean your work area.
Make sure that there are no:
- Flammable materials such as shop rags, gas cans and other solvents.
- Objects or people nearby who are positioned close enough to be hit by sparks or debris.
- Loose objects that could get caught in the grinding wheel.
Step 3: Inspect all aspects of the grinder.
If any of the following questions can be answered with a yes, do not operate the grinder.
- Are there breaks in the insulation or exposed wires on the power cord?
- Is the cords ground terminal broken or damaged?
- Is the stone cracked or chipped?
- Are any of the guards missing or damaged?
Step 4: Check the tongue guards for clearance.
Tongue guards on the top of the wheel should be positioned no more than ¼ of an inch away from the stone.
The bottom guard which connects to the work table should be positioned no more than 1/8 of an inch away of the stone.
If the clearances arent adjusted to the specifications above, do not use the grinder.
Follow these steps to adjust the guards:
- Check that the power is off and the lock is removed before adjusting the guards.
- To adjust the guards, loosen the nuts which hold them in place.
- Slide the guard toward the stone within the proper dimension.
Tip: Tongue guards will only need readjustment when the stone diameter decreases with wear.
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Lawn Mower Blade Sharpening Tool
I generally sharpen the blades for my 60 inch cut mower 5 sets per session. The mower uses 3 blades, so that’s 15 blades. I use a Bench grinder but holding them while sharpening is a tiring, difficult job. I thought, “There must be a better way of doing this.” I made this tool which consists of a pair of Vice Grips welded to an adjustable bracket that slides back and forth on a long rod mounted on the front of the bench, below the grinder. It really works good. Sorry I cannot furnish photos of it’s construction, but I would be glad to take some more detailed photos of it if anyone is interested.
Check For The Proper Filing Angle
- File in the direction of the original cutting angle.
- Always sharpen from the top side of the cutting edge this will give you the longest-lasting edge on the blade.
- Note: The file cuts in one direction only, on the push stroke you’ll feel it bite into the steel on the blade. If you don’t feel that cutting action, your file is probably dull or you’re not pressing down hard enough.
- Don’t try to make your blade razor sharp it’ll dull more quickly. Butter-knife sharp will do.
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Using A Bench Grinder To Sharpen Lawn Mower Blade
Of course, it is a lot easier to put the lawn mower blade into a vise and hand file it sharp. All you are losing is a little time. But if you do not have the time to sharpen the blade the old fashioned way, a good alternative is to use your bench grinder.
Your bench grinder has the right grit on its wheels to sharpen your lawn mower blade just right. Plus, you can use the second wheel with a finer grit to smooth out any nicks or other abrasions that are on the blade.
Because of the high powered motor, you will have to be careful of the amount of pressure you place on the spinning grinding wheels. You will also have to keep an eye on the angle you are using. You need to maintain that angle to make sure you get the blade as sharp as possible.
Then you will need a steady hand and a lot of patience as one false move may damage the blade and you may need to replace it or work harder to get it sharp. Being careful and safe makes the bench grinder the perfect tool to sharpen your lawnmower blades.
How To Sharpen A Lawnmower Blade With A File
Sharpening of lawnmower blade with a metal file is the best way and its very easy.
A file is basically a piece of metal with a rough surface, and when rubbed against a surface it makes it sharper.So, we use the file to rub it again our mulching lawn mower blade to sharp it.
- First, you need a vise in which you will fit the blade and tighten it down to hold the blade securely from the middle.
- Now trace the angle on the cutting edge where it needs sharpening.
- Now you can downstroke the narrow file in the same direction as the blade cutting edge is. It is just like you are swiping your credit card.
- After few strokes, you will get a nice edge on that blade.
- Once your blade is shiny and feels sharp on your thumb, then it confirms that you have sharpened your blade. Dont forget to check its balance at the end.
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Proper Angle To Sharpen Lawn Mower Blades
Getting the correct angle on your lawn mower blade can be a bit confusing. Different handymen recommend different angles for the best cut. The range of their suggestions is between 30 and 60 degrees or points in between.
For finer cuts and a nicer looking lawn, you will want a lower angle. That would put the edge of the blade at about 30 to 40 degrees. Some manufacturers suggest a 37-degree edge is perfect for their lawn mowers.
A lot depends on what you are cutting as well. The type of grass, its thickness and so on. On the other hand, a blade sharpened at 60 degrees may protect against nicks but it will also tear the grass out and not cut it.
Why Sharpen A Lawn Mower Blade At All
You may think a blade spinning at over 180 mph or more wouldnt need to be terribly sharp to cut grass. Youd be right. However, a nice sharp blade will slice through grass and allow it to grow in a more healthy manner.
Why does this matter? Because shredded grass tips will quickly turn brown, leaving your lawn looking ragged and burnt. The following image helps illustrate this:
For professionals, and people whoquite franklyjust like a nice lawn, having sharp lawnmower blades truly matters for a professional look. This goes triple for species like Fescue which grow more or less straight out of the ground and require frequent cutting.
We know professionals who sharpen their zero turn mower blades every other day.
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Bench Grinder Jig For Lawn Mower Blades
It is possible to make sharpening your lawn mower blade a lot easier. The real issue in getting the sharpness is getting the angle right. A good bench grinder jig will ensure that you have the correct angle and maintains that angle throughout the sharpening process.
There are a variety of ways to build your jig to make sharpening your lawnmower blade simpler and a lot less stressful. Just to see one good example of a jig to sharpen your lawn mower blade.
The inventor used his angle grinder, but it looks like it can be adapted to a bench grinder as well. Who knows, maybe his example will spark some creative ideas in you and you will build the right jig for you.