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A polesaw (also pole saw or giraffe saw) is a saw attached to a pole or long handle that is used for pruning tree branches that are beyond arm's reach. [1] [2] A polesaw allows its user to cut high branches without the use of a ladder. [3] Polesaws can be manual or motorized.
Such a saw would typically be 1 to 4 m (4 to 12 feet) long, and sometimes up to 5 m (16 feet), with a handle at each end. In some cases, such as when felling Giant Sequoias, sawblades could be brazed together end-to-end in order to create longer saws. The technique in using a two-man saw involved a sawyer standing at each end.
Fig.1 shows the handle and head of an averruncator. Fig. 2 shows the head in use. Secateurs have short handles and are operated with one hand. [6] A spring between the handles causes the jaws to open again after closing. When not in use, the jaws may be held closed by a safety catch or by a loop holding the handles together.
They transition to a tapered round cross section 12 to 18 inches from the point. The handle end may terminate in a ball or may be cut off squarely at 5/8 to 3/4 inch diameter. They are made of forged steel and may be from five to six feet long. Lining bars may also be called jack bars, jack handles, or crowbars in North American railroad jargon.
A hand-held circular saw is the most conventional circular saw. This miter saw is a circular saw mounted to swing to crosscut wood at an angle. A table saw. Tractor-driven circular saw. A circular saw or a buzz saw, is a power-saw using a toothed or abrasive disc or blade to cut different materials using a rotary motion spinning around an arbor.
The shaded-pole motor is the original type of AC single-phase electric motor, dating back to at least as early as 1890. [1] A shaded-pole motor is a motor, in which the auxiliary winding is composed of a copper ring or bar surrounding a portion of each pole to produce a weakly rotating magnetic field . [ 2 ]