I built a machine for grinding / milling stump. I made a 350mm disc, and to drive the shield used gas power engine 420cc 15HP. I reduced the rotation on the disc. I reduced the rotation on the disk with teeth by using 120mm pulleys on the disc, 80mm pulley for the engine. In order for the machine to be safe, I made covers of thick sheets, brakes and an emergency switch that immediately turns off the machine.
The machine does a great job, the disk rotation is not too high or too low, easy to maneuver even in difficult terrain.





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