Stump grinders can be the size of a lawn mower or as large as a truck. Most accomplish their task by means of a high-speed disk with teeth that grinds the stump and roots into small chips. A typical stump grinder incorporates a cutter wheel with fixed carbide teeth. The cutter wheel movements are controlled by hydraulic cylinders to push the cutter head laterally through the stump and to raise and lower it. If choosing to stump grind yourself, there are some safety rules that should be adhered to: