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The purpose of this scroll is to list the types of gears usable at this time. It should be noted that all gears are made of wood and must be carved by hand and are, therefore, not used needlessly or often unless there is no other way to reduce the effort required to perform necessary tasks. Most of these listed below are used in conjunction with water wheels or, more rarely, windmills. One should always be aware that these gears, being made of wood, are susceptible to thread fall and moisture and should always be placed within a dry enclosure that is impervious, or at least resistant, to both. As with all machinery, it is recommended that each gear be coated with a mixture of waxes. They should also be kept as frictionless as possible by the application of generous amounts of lubricants such as herdbeast or wher fat rendered for such purposes. SPUR GEAR: A gear wheel having radial teeth parallel to the axle. BEVEL GEAR: A gear wheel meshed with another so that their shafts are at an angle less than 180 degrees CROWN GEAR: A gear wheel with teeth set in the rim perpendicular to its plane. WORM GEAR: A short rotating screw that meshes with the teeth of another gear. As a worm gear is an inclined plane, it will be the driving gear in most cases. DIFFERENTIAL GEAR: A certain arrangement of gears connecting two axles in the same line and dividing the driving force between them, but allowing one axle to turn faster than the other. RACK GEAR: A toothed bar into which a "pinion," (worm gear spur etc ) meshes. PINION: A small cogwheel, the teeth of which fit into those of a larger gearwheel or those of a rack. COGWHEEL: A wheel with a rim notched into teeth, which meshes with those of another wheel or a rack to transmit or receive motion. IDLER GEAR: A gear wheel placed between two other gears to transmit motion from one to the other. It does not alter the speed of the output, but it does alter the direction it turns. RATCHET: A toothed wheel or bar that catches and holds a pawl, which thus prevents backward movement. PAWL: A mechanical device allowing rotation in only one direction.
Sources http://www.geocities.com/Baja/8205/gears.htm |