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A stump grinder is a machine designed to remove tree stumps by using a rotating cutting disc that chips away the wood. The machine typically features a cutter wheel with fixed carbide teeth. The cutter wheel's movements are controlled by hydraulic cylinders , which allow it to move laterally and vertically to grind through the stump.
The largest machines used in wood processing, often called "tub or horizontal grinders", may handle a material diameter of 2.4 m (8 ft) or greater, and use carbide-tipped flail hammers to pulverize wood rather than cut it, producing a shredded wood rather than chip or chunk. These machines usually have a power of 150–750 kW (200–1,000 hp).
The stump is the base of the trunk and the attached woody roots. Tree stumps and roots are extracted using a hydraulic head on a tracked excavator or with a mechanical head equipped by a special tool for tractors. Stump harvesting is expected to provide an increasing component of the woody material required by the woody biomass power sector in ...
Tree height is measured to a merchantable top, the point at which a tree can be accepted for use by a sawmill. This point can be reached either by defects (extreme sweep, crook, deviating branching, or other defects) or at a diameter limit for very straight trees. A common cutoff is 4 inches (10 cm) diameter, which is acceptable for pulpwood.
It is often used for cutting woody plants such as saplings and small branches, for hedging and for snedding (stripping the side shoots from a branch). [3] In France and Italy it is widely used for pruning grape vines. The billhook is the European equivalent of tools such as machetes, parangs, and kukris. Prior to the advent of chainsaws ...
The Bryant Chucking Grinder Company was founded in 1909 by William LeRoy (Roy [6]) Bryant, one of the machine tool entrepreneurs mentored by James Hartness of the Jones & Lamson Machine Company (J&L). Roy Bryant had joined J&L in 1897, [3] became chief draughtsman in 1899, [3] and was chief engineer by 1905. [3]
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