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- John_T._Parsons abstract "John T. Parsons (October 11, 1913 – April 19, 2007) pioneered numerical control for machine tools in the 1940s. These developments were done in collaboration with his employee Frank L. Stulen, who Parsons hired when he was head of the Rotary Wing Branch of the Propeller Lab at Wright-Patterson Air Force Base, in April 1946. Together, they were the first to use computer methods to solve machining problems, in particular, the accurate interpolation of the curves describing helicopter rotor blades. In 1946, "computer" still meant a punched-card operated calculation machine. In 1948, Parsons' company, "Parsons Corporation" of Traverse City, Michigan, was awarded a contract to make the innovative and challenging tapered wings for military aircraft; they won the contract because they developed the computer support to do the difficult three-dimensional interpolation for the complex shapes, as well as the 800 steps long production cycle for the wing manufacturing. IBM was one of the subcontractors, as was MIT, which took care of the servomechanisms. The latter lab boosted the developments of CNC machining in the following decades, by developing reliable servo control in 1952 and the APT (Automatic Programmed Tool) programming language for CNC machines. It was only after the servos were also steered by computers that real "numerical control" was realised. The initial developments of Parsons and Stulen were only about the calculations, and not the control: the results of the calculations were given to human operators that turned the wheels on the machine tool to generate the desired tool paths.Parsons, however, quickly saw the potential of connecting computers to the machine motors. On January 14, 1958, he received a patent for a Motor Controlled Apparatus for Positioning Machine Tool (patent number 2,820,187, filed on May 5, 1952).The initial developments of NC machines, however, had been so expensive, that Parsons was fired from his own company, because the funding of the MIT developments was too much for the company. Parsons was reinstated as president of the company, after royalties on the patent had generated significant amounts of money. (Bendix Corporation was an initial license taker of the patent, in 1955, and eventually bought all the rights to it.)In 1985, Parsons and Stulen received the National Medal of Technology. In 1988 he received an honorary Doctor of Engineering degree from the University of Michigan. In 1993, Parsons (but not Stulen) was inducted into the National Inventors Hall of Fame for inventing numerical control.On Wednesday April 19, 2007 John T. Parsons died at the Grand Traverse Pavilions. He was 93. He had a son, David Cameron Parsons.".
- John_T._Parsons birthDate "1913-10-11".
- John_T._Parsons birthPlace Detroit.
- John_T._Parsons birthYear "1913".
- John_T._Parsons deathDate "2007-04-19".
- John_T._Parsons deathPlace Traverse_City.
- John_T._Parsons deathPlace Traverse_City,_Michigan.
- John_T._Parsons deathYear "2007".
- John_T._Parsons occupation Invention.
- John_T._Parsons occupation John_T._Parsons__1.
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- John_T._Parsons wikiPageWikiLink APT_(programming_language).
- John_T._Parsons wikiPageWikiLink APT_programming_language.
- John_T._Parsons wikiPageWikiLink Bendix_Corporation.
- John_T._Parsons wikiPageWikiLink CNC.
- John_T._Parsons wikiPageWikiLink Category:1913_births.
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- John_T._Parsons wikiPageWikiLink Category:National_Medal_of_Technology_recipients.
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- John_T._Parsons wikiPageWikiLink Computer.
- John_T._Parsons wikiPageWikiLink Detroit.
- John_T._Parsons wikiPageWikiLink Frank_L._Stulen.
- John_T._Parsons wikiPageWikiLink Helicopter_rotor.
- John_T._Parsons wikiPageWikiLink IBM.
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- John_T._Parsons wikiPageWikiLink Massachusetts_Institute_of_Technology.
- John_T._Parsons wikiPageWikiLink Michigan.
- John_T._Parsons wikiPageWikiLink National_Inventors_Hall_of_Fame.
- John_T._Parsons wikiPageWikiLink National_Medal_of_Technology.
- John_T._Parsons wikiPageWikiLink National_Medal_of_Technology_and_Innovation.
- John_T._Parsons wikiPageWikiLink Numerical_control.
- John_T._Parsons wikiPageWikiLink Patent.
- John_T._Parsons wikiPageWikiLink Servomechanism.
- John_T._Parsons wikiPageWikiLink Traverse_City.
- John_T._Parsons wikiPageWikiLink Traverse_City,_Michigan.
- John_T._Parsons wikiPageWikiLink University_of_Michigan.
- John_T._Parsons wikiPageWikiLink Wright-Patterson_Air_Force_Base.
- John_T._Parsons wikiPageWikiLinkText "John Parson's".
- John_T._Parsons wikiPageWikiLinkText "John Parsons".
- John_T._Parsons wikiPageWikiLinkText "John T. Parsons".
- John_T._Parsons birthDate "1913-10-11".
- John_T._Parsons birthPlace Detroit.
- John_T._Parsons children "Carl, John, Robert, Grant, David Cameron Parsons, Meredith".
- John_T._Parsons dateOfBirth "1913-10-11".
- John_T._Parsons dateOfDeath "2007-04-19".
- John_T._Parsons deathDate "2007-04-19".
- John_T._Parsons deathPlace Traverse_City.
- John_T._Parsons deathPlace Traverse_City,_Michigan.
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- John_T._Parsons name "John T. Parsons".
- John_T._Parsons name "Parsons, John T.".
- John_T._Parsons occupation Invention.
- John_T._Parsons occupation Inventor.
- John_T._Parsons parents "Carl and Edith Thoren".
- John_T._Parsons placeOfBirth Detroit.
- John_T._Parsons placeOfDeath Traverse_City.
- John_T._Parsons placeOfDeath Traverse_City,_Michigan.
- John_T._Parsons shortDescription "American inventor".
- John_T._Parsons spouse "Elizabeth Parsons".
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- John_T._Parsons description "American inventor".
- John_T._Parsons description "American inventor".
- John_T._Parsons subject Category:1913_births.
- John_T._Parsons subject Category:2007_deaths.
- John_T._Parsons subject Category:National_Medal_of_Technology_recipients.
- John_T._Parsons subject Category:People_from_Detroit,_Michigan.
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- John_T._Parsons comment "John T. Parsons (October 11, 1913 – April 19, 2007) pioneered numerical control for machine tools in the 1940s. These developments were done in collaboration with his employee Frank L. Stulen, who Parsons hired when he was head of the Rotary Wing Branch of the Propeller Lab at Wright-Patterson Air Force Base, in April 1946.".
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- John_T._Parsons givenName "John T.".
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