How to Build a Homemade Brush Cutter: A Comprehensive Guide

A brush cutter is an essential tool for clearing out dense overgrowth, weeds, and other unwanted vegetation in your yard or garden. 

Store-bought models can be expensive, but you can build a homemade brush cutter that is just as effective. In this guide, we will walk you through the steps to build a brush cutter that is durable, reliable, and easy to use.

Materials and Tools

Before you start building your brush cutter, you need to gather the materials and tools you will need. Here is a list of everything you need: 


  • A lawn mower or a trimmer with a straight shaft
  • A cutting blade
  • A set of bolts and nuts
  • A welding machine
  • A metal sheet
  • A set of bearings
  • A set of washers and lock washers
  • An angle grinder

Paint and primer


  • A drill
  • A welder’s mask
  • A cutting wheel for the angle grinder
  • A measuring tape
  • A set of wrenches and pliers
  • A center punch
  • A hammer

Preparing the Engine 

The first step in building your brush cutter is to prepare the engine. You can use either a lawn mower or a trimmer with a straight shaft. The important thing is to make sure that the engine is in good working condition and has enough power to drive the cutting blade. 

Cutting the Metal Sheet 

Next, you need to cut a piece of metal sheet to the size of the blade you plan to use. This will be the support structure that will hold the cutting blade in place. You can use an angle grinder with a cutting wheel to make the cuts. 

Welding the Metal Sheet to the Engine 

Once the metal sheet is cut to size, it’s time to weld it to the engine. Make sure to wear a welder’s mask to protect your eyes and face from sparks and debris. You should also make sure that the engine is properly secured to a flat, stable surface. 

Installing the Cutting Blade 

The next step is to install the cutting blade onto the metal sheet. You will need to drill holes into the metal sheet that are the same size as the bolts that will secure the blade in place. Make sure to use a center punch to mark the spots where you need to drill the holes. 

Installing the Bearings 

Next, you need to install the bearings onto the shaft of the engine. These bearings will support the cutting blade and reduce the load on the engine. Make sure to use washers and lock washers to keep the bearings secure. 

Testing the Brush Cutter 

Once you have completed all the steps, it’s time to test the brush cutter. Start the engine and engage the cutting blade. If everything is working properly, the blade should spin freely and cut through the vegetation with ease. If you notice any problems, stop the engine immediately and make the necessary adjustments. 

Painting and Priming 

The final step is to paint and prime the brush cutter to protect it from rust and other elements. Use a primer that is suitable for metal and paint that will provide a durable, long-lasting finish. 

Troubleshooting Common Issues 

Despite your best efforts, you may encounter some issues with your homemade brush cutter. Here are some common problems and how to troubleshoot them:


  • Engine won’t start: Make sure that the spark plug is clean and properly connected, and that there is enough fuel in the tank. Check the air filter and clean it if it’s dirty. 
  • The cutting blade won’t spin: Make sure that the blades are properly secured to the metal sheet and that the bearings are installed correctly. Check the connection between the engine and the cutting blade, and make sure that there are no obstructions.
  • Engine vibrates excessively: Make sure that the engine is securely attached to the metal sheet and that the metal sheet is evenly balanced. Check the alignment of the bearings and make sure they are not worn out.
  • Cutting blade dulls quickly: Make sure that you are using the right cutting blade for the type of vegetation you are cutting. If the blade is dull, sharpen it or replace it with a new one.
  • Engine overheats: Make sure that there is enough airflow around the engine to dissipate heat. Check the air filter and clean it if it’s dirty. Make sure that the fuel mixture is correct, and that there is no clogging in the carburetor.


Building a homemade brush cutter is a great way to save money and get the job done. With the right materials and tools, you can build a brush cutter that is durable, reliable, and easy to use. Just be sure to follow the steps in this guide and troubleshoot any issues that arise. 

Hope that now you have all the information you need to get started on your brush cutter building project. Good luck, and have fun!