turntable


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turntable

1. the circular horizontal platform that rotates a gramophone record while it is being played
2. a flat circular platform that can be rotated about its centre, used for turning locomotives and cars
3. the revolvable platform on a microscope on which specimens are examined

turntable

[′tərn‚tā·bəl]
(engineering acoustics)
The rotating platform on which a disk record is placed for recording or playback.

turntable

A playback machine for vinyl phonograph records, which were a major music distribution medium throughout the 20th century. The turntable contains a rotating platter for the disc and an arm that holds a cartridge and needle (stylus). The needle is a diamond chip attached to a metal cantilever that causes a coil or magnet to move inside the cartridge as it bounces along the sound wave undulations "carved" in the V-shaped grooves of the vinyl.

Records Degrade With Usage
A major problem with vinyl records is the wearing of the inner surfaces of the groove by the needle. Over the years, an enormous amount of mechanical engineering went into the design of turntables and needles that would accurately track the grooves with as little pressure as possible.

Still Made
Analog turntables are still being made and used by people who have extensive vinyl record collections as well as by disc jockeys (DJs). See vinyl record, record player, LP, Laser Turntable, USB turntable and DJ turntable.


The Modern Turntable
Popular for decades, Technics turntables were the first to include variable pitch control, which DJs use to create special sound effects. (Image courtesy of Panasonic Consumer Electronics Company.)







Slightly Older
A marvel of technology in 1913, this RCA turntable was hand cranked to spin 78 RPM records. Note the size of the needle used to track the grooves. Subsequent needles were minuscule by comparison. (Equipment courtesy of the Lumberville Store, Lumberville, PA.)







High-End Turntables
Lest one think turntables are a 20th century phenomenon, these units were just a few of the turntables showcased at the High Performance Audio show at CES 2010 in Las Vegas. The most extreme unit (top) was USD $96,000 without tonearms and cartridges. See CES.
References in periodicals archive ?
Noisestra is an hour-long work for the turntable ensemble Noisestra, using 14 turntables.
DO they still sell turntables to play old 33/45 records?
Standard-mount cartridges are preferable for cartridges above $70 if for no other reason than giving you the option to migrate to a better turntable while retaining the same cartridge.
While that's a good idea--except in desert environments where the grease will attract sand and grind up the teeth--it's not a substitute for lubing the turntable.
The total cost of the turntable, including the plywood, is about $40.
Conveying systems include turntables and carousels.
This will avoid damage to the turntable, damage between the door and oven cavity, or heat damage to the turntable support ring or turntable drive coupling.
Imola, IL) has patented a plant for forming predetermined quantities of synthetic material comprising a rotary turntable carrying on its periphery a plurality of dispensing devices, and means for feeding the material in the molten state to said dispensing devices; the plant also comprises a fixed part directly connected to the molten material feed, a rotary sealed joint connecting said fixed part to the rotary turntable, operating means for interacting with the dispensing devices positioned on the rotary turntable to operate them in the sense of opening and closing them in response to the rotations of the turntable, and means for rotating the turntable.
A line of miniature thin-section turntable bearings, the Reali-Slim TT Series, is said to have several advantages.
The motorized turntable is designed for the calibration of large rotary tables or the rotary A, B, and C axes of large gantry and 5-axis machine tools.