Resulting in damage to teeth & front serrations so they quickly lose their sharp edge and their effectiveness at cutting. The multiple teeth of the old design also made it much more time consuming and difficult for many people to resharpen.
As the teeth start to lose their sharp edge, you tend to push the brush cutter harder into the job and this results in the Flail-Blades flicking back harder. If you push hard enough and slow the blade down to just the right speed, the Flail-Blade hits the Anti-Fouling blade stop with enough force that it bounces forward with enough speed to impact with the blade in front of it as it is being flicked back.
This was not a problem that I had encountered because, I learnt early on to keep the teeth very sharp for maximum cutting efficiency and because I only had a low powered 22cc brush cutter I did not have the power to lean into the job. It was feedback from a number of customers, that this was a problem and one that need solving to make a better longer lasting brush cutter blade.
By increasing the diameter of the hubs by 20mm and reducing the length of the Flail-blade by 10mm, plus correctly placing an extra Anti-Fouling-Blade stop, made it impossible for the Flail–Blades to hit one another.
Now the only way you can damage the teeth, is contact with dust, dirt, a rock or metal fence post.
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