I was not aware of the videos or of the conversion kits until well after I posted this Instructable. Amazon offers brush blades and adapter washers for use on weed trimmers, usually for Stihl or Husqvarna. Notice the operator is always a very safe distance from the blade and the machine is never even close to out of control. Most users are more aggressive and cut much larger things than shown in this video. There are a number of videos at YouTube in which people cut brush with a blade on a weed trimmer. This video from 30 seconds in to 2:50 in from the beginning is very typical of my experience with a brush cutting blade on a weed trimmer, except I have limited myself to cutting things at ground level. UPDATE: As you can see in the comments below, several expressed strong concerns about safety. The blade begins to make a singing noise at about half of full open on the throttle. Keeping the speed up limits this tendency. *If the speed is too slow, the spinning trimmer head tends to wrap with long grasses. Release the gas trigger when the stalk has been fully cut. Move the blade into contact with stalks of the brush to be cut. Hold the engine at that speed.* Rotate boom to the side so the blade is at an angle. While the blade is far away from any grass or brush, smoothly accelerate until the blade begins making a singing sound. As long as I accelerate gradually and let the saw do the work I do not believe I am stressing the bearings or the drive shaft. Also, when the trigger for the gasoline is released, the blade automatically stops. In any kind of normal use, the hands and feet are automatically more than three feet away from the blade in both cases. Both my blade and the commercial blade could cause injury, if someone carelessly moved a foot or a hand too close to the blade. ![]() It has four large cutout sections for four bumps that approximate teeth. The commercially available brush cutting blade for this weed trimmer uses a blade slightly larger in diameter than my blade.
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