How to Sharpen Brush Cutter Blade

Ready to know how to sharpen brush cutter blade? In this very guide, I will show you the exact step-by-step process you need to get the blade in shape.

Not to mention, brush cutters are highly versatile for landscaping work.

They can tear through the toughest vegetation in your garden and areas where a standard lawnmower struggles.

That being said, the cutter blade (be it chisel or circular) needs to be taken care of and sharpened as soon as the tips begin to look rounded or crooked.

But how will you do that? Well, be with me till I finish and you’ll end up learning how to do it the right way.

List of Tools You Might Need:

  • Thick Hand Gloves
  • Clean Rag
  • Soap
  • Wire Brush
  • Meal File/Whetstone/Bench Grinder

How to Sharpen Brush Cutter Blade?

Step 1: Preparing the Workplace

Before getting into the main procedure, find a suitable workstation so that you can implement the task with zero risk factors. It will also ensure that you’ve fewer issues after work.

At first look for a place that doesn’t have any inflammable sitting around. If it is not manageable, you must at least position the brush cutter 20 feet away from them.

A well-ventilated place with flat surfaces is recommended at the same time. Besides this, don’t forget to lay down a groundsheet across the workplace. By the end of the session, it will make cleanup a lot easier.

Step 2: Ensuring Personal Safety

Don’t ignore the fact that you’re dealing with a sharp cutting machine and the accident could take place before you realize it.

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That’s why you must take safety precautions regardless of the circumstances.

At the very least you should equip yourself with a pair of heavy-duty hand gloves. You can wear safety boots and heavy trousers as well.

This way, you can save your lower body from potential injuries in case the blade accidentally falls off the workbench.

Step 3: Preparing the Machine

The loss could be unthinkable if the engine starts accidentally while you work. 

Therefore, before you move on remove the blade, power off the machine from the outlet, and switch off the engine ignition wire.

You should empty the fuel tank or at least hand tighten the filter cap to avoid gasoline or oil leak. Next, place the trimmer upside down on your workbench.

Step 4: Marking the Blade End

You should put a mark on the blade’s sharp end prior to removing it. This way, you won’t end up reinstalling it on the wrong side that doesn’t cut grass.

You can mark it with a grease pen, but if you don’t have one, stab a piece of sticky colored tape on it.

Step 5: Removing the Blade

It is time to remove the blade from the deck spindle. But before you proceed, remember you should only hold the blade opposite to the sharp side in order to avoid getting your hand injured.

Now, you’ll notice that the blade is securely attached to its center with a bolt. And, it tends to swirl with the wrench while trying to unscrew the blade off. Therefore, you must immobilize the blade first.

I use a 4mm hexagon wrench, insert this into the locking hole, and slowly turn the blade until I feel the wrench drop into the internal ring. It literally blocks the blade from turning together when loosening the nut.

Once you’ve ensured the blade isn’t turning, use a spark plug wrench to loosen the nut. Release the blade from the spindle that way and place it on your workbench.

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Step 6: Cleaning the Debris

With repeated use, the blade is likely to accumulate a lot of grime and clipped grass on its surface. Use a wire brush to scrub all this debris off before sharpening.

Rinse the blade thoroughly in soapy water and dry with a clean rag afterward. In case it isn’t too dirty, rubbing with lubricating oil will work fine too.

Step 7: Stabilizing the Blade

To ensure proper execution it is essential that the blade doesn’t move even by an inch while sharpening. The best option is to secure it on a bench vise or clamp.

Step 8: Sharpening the Blade

If you’ve got a slightly dull blade, dragging on a File or Whetstone should be sufficient in restoring the usual sharpness.

On the other hand, if the blade shows severe wear you might require the work of an angle grinder.

Let’s discuss each of them briefly.

Flat File: You will often find that metal sharpeners like whetstone are not getting the correct angle to sharpen those bent edges.

And, this is exactly where a flat File comes in handy. Simply grab a 7/32 file at a 10-degree angle to the edge of the blade.

Start filling it down the dull end, come back up, and continue the motion. Never run it back and forth like you’re sawing it.

Flip it over after a few strokes and repeat the process on the other side. However, this time you have to do it in the opposite direction and continue until the edge looks shiny.

Whetstone: If you have a thickened edge on the blade, sharpening by a whetstone would be appropriate. First, make sure that the stone is well positioned on your workbench.

You can hold it on a C-clamp so that it doesn’t tip over. Now grab your blade facing a 45-degree angle to the coarse side of the stone.

And, with that angle, pull the dull edge over the stone going in and out motion while alternating the side respectively.

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Continue until both sides are thin enough to cut. Then you want to flip the stone to the finer side and repeat the same process for a nice smooth finish.

Grinder: Bench grinder is an excellent option to restore a damaged bevel edge in the least amount of time. Again, you’ve to place the grinder in a stable position on your workbench first.

And, as you turn it on, start grinding the blade back and forth on the running stone on each side.

This will make the blade incredibly sharp so you won’t have to do it anytime soon.

Step 9: Ensuring Balance

I wouldn’t recommend you reinstall the blade unless it is properly balanced. Because an imbalanced blade doesn’t only cut inconsistently but can also shake the components apart.

Therefore, it’s important to check whether the weight is equally distributed or not.

You can do it simply by changing the blade’s mounting hole onto a nail.

And, if you notice one side is dipping a bit more, try a few strokes with the file to that heavier side. It will cut off some weight and help restore balance.

Step 10: Reinstalling

Once the blade is fairly balanced, reinstall it on the cutter. And, as mentioned earlier, make sure to attach the blade on the right side following the mark.

Thus, you’ll be done with the sharpening and it will be prepared to go.

Final Words

If you are still with me, I believe you have enjoyed my guide on how to sharpen the brush cutter blades in the right way and everything is clear to you now.

If there is anything you would like to know more about, feel free to drop your comment below and I’ll be at your service in no time.

Lastly, I hope you are able to maintain a well-tendered lawn with your beautiful brush cutter.