Mini Metal Lathe
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Lathe
''This article is about a lathe as a tool. lathe (graphics) and lathe (division) for other meanings.''
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thumb|right|350px|Conventional lathe
In woodturning, metalworking, metalspinning, and glassworking, a lathe is a machine tool which spins a block of material so that when abrasive, cutting, or deformation tools are applied to the block, it can be shaped to produce an object which has rotational symmetry about an axis of rotation. Examples of objects that can be produced on a lathe include candlestick holders, table legs, bowls, baseball bats, crankshafts or camshafts.
The material is held in place by either one or two ''centers'', at least one of which can be moved horizontally to accommodate varying material lengths. An adjustable horizontal metal rail between the material and the operator accommodates the positioning of shaping tools. With wood, it is common practice to press and slide sandpaper against the still-spinning object after shaping.
In a metalworking lathe, metal is removed from the workpiece using a hardened cutting tool, which is usually fixed to a solid moveable mounting called the "toolpost", which is then moved against the workpiece using handwheels and/or computer controlled motors.
In metalspinning, a disk of sheet metal is held perpendicularly to the main axis of the lathe, and tools with polished tips areare hand held, but levered by hand against fixed posts, to develop large amounts of torque/pressure that deform the spinning sheet of metal.
In a woodworking lathe most tools are hand held.
In a glassworking lathe a torch to soften the glass may be either hand-held, or mounted to a banjo/crossslide. Tools to deform the glass, and tubes to blow (inflate) the glass are usually handheld.
Major Categories of Lathes
Woodworking Lathes
Woodworking lathes are the oldest variety of lathes. All other varieties are descended from these simple lathes.
Metalspinning Lathes
Metalspinning lathes
Lathe
Is this original work? -- Zoe
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How about adding some material on lathes that produce objects with elliptical and skewed symmetry? They were well known in the 16th century, but do not seem so common now. AK.
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I have heard that a lathe is the only machine tool capable of reproducing itself. Does anyone have a source on this? Kd5mdk 06:56, 12 Apr 2005 (UTC)
:No offence, but that sounds rather stupid.--84.139.62.107 10:45, 10 May 2005 (UTC)
Lath
Lath is any material that is used to span interstices between structural framing, and create a smooth surface for a plasterer to apply mortar. In older buildings, thin strips of wood were used, but any wood or metal can be used, as well as gypsum.
Gypsum was one of more commonly used materials. Gypsum lath consists of gypsum plaster sandwiched between two sheets of absorbent paper. It was invented in 1910, and multiple variations were developed in the 1930s. Gypsum was safer than wood lath as it wasn't combustible, was easier to use, and gave better results.
The lath and plaster method declined in the 1950s, as it was replaced by the more effecient drywall.
Category:Materials
Lathe (Graphics)
In 3D computer graphics, a lathed object is a 3D model whose vertex geometry is produced by rotating the points of a spline or other point set around a fixed axis. The lathing may be partial; the amount of rotation is not necessarily a full 360 degrees. The point set providing the initial source data can be thought of as a cross section through the object.
See Also: Solid of revolution
Lathe (Division)
A lathe was an administrative division of the county of Kent, in England, from the Anglo-Saxon period until it fell entirely out of use in the early twentieth century.
It is believed that they were originally formed around the royal settlements of the Kingdom of Kent. By the late Saxon period, they had become purely administrative units, each of which contained several hundreds.
By the late eleventh century, West Kent was divided into three lathes: the Lathe of Aylesford, Lathe of Milton and Lathe of Sutton. East Kent was divided into four: the Lathe of Borough, Lathe of Eastry, Lathe of Lympne and Lathe of Wye.
In the thirteenth century, the lathes of Borough and Eastry were merged to form the Lathe of Saint Augustine, the lathe of Lympne was renamed the Lathe of Shepway, the lathes of Sutton, Milton and Wye were merged and redivided to form the Lathe of Scraye and the Lathe of Sutton-at-Hone. The Lathe of Aylesford survived unchanged.
The Lathe Of Heaven
''The Lathe of Heaven'' is a 1971 science fiction novel by Ursula K. Le Guin. It has been adapted into two television films. The novel was nominated for a Hugo Award and won the Locus Poll Award for best novel in 1972. It first appeared in the magazine Amazing Stories, before being published in paperback in 1973; a paperback edition was reprinted in New York by Eos in 1997 with ISBN 0380791854.
The novel is set in Portland, Oregon at some near future time when overpopulation is a major problem. However, this is soon revealed to be only one of many future worlds that have been literally dreamed into existence by the main character, George Orr, whose subconscious mind has an inexplicable power over reality. An ambitious psychiatrist, William Haber, discovers this power and seeks to use it to change the world; his experiments produce a series of increasingly intolerable alternate worlds, based on an assortment of utopian and dystopian premises familiar from other science fiction works.
Though technology plays a slight role, the novel is largely concerned with philosophical questions about our desire to control our destiny, with Haber's positivist approach pitted against a Taoist equanimity (the title is a reference to Chuang Tzu). Due to its portrayal of psychologically-derived alternate realities, it has often been described as Le Guin's homage to Philip K. Dick.
The 1980 adaptation—generally faithful to the novel—was produced by the public television station WNET, directed by David Loxton and Fred Barzyk. It starred Bruce Davison, Kevin Conway, and Margaret Avery.
A second adaptation, retitled ''Lathe of Heaven'', was produced for the A&E network in 2002 and directed by Philip Haas. It starred James Caan, Lukas Haas, and Lisa Bonet.
Ursula K. Le Guin
1980 version
2002 version
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Lathe of Heaven, The
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Lath And Plaster
Lath and plaster is a somewhat outdated building process used mainly for interior walls. Its use began to decline in the late 1950s as drywall began to replace it.
The process begins with wood laths. These are narrow strips of wood nailed horizontally across the wall studs. Over this goes two coats of plaster: a rough, sandy coat (called a brown coat) and a smooth, finish coat. After the plaster is completely dry, the walls are ready to be painted.
Eventually the wood laths were replaced with rock lath, which is a type of gypsum wall board available in sheets size 2 by 4 feet. The purpose of the four-foot length is so that the sheet of lath reaches exactly across three wall studs, which are spaced 16 inches apart on center (American building code standard measurements).
Lath and plaster has been replaced altogether with drywall (also a type of gypsum wall board, although a bit thicker), since no plaster is applied afterwards.
Although plastering as a building process has all but disappeared, there remain still a few skilled professionals (plasterers) who are employed mainly to do small jobs and patchwork in older buildings where drywall may not as easily match the existing finish.
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