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January 15
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January 15 in recent years
2018 (Monday)
2017 (Sunday)
2016 (Friday)
2015 (Thursday)
2014 (Wednesday)
2013 (Tuesday)
2012 (Sunday)
2011 (Saturday)
2010 (Friday)
2009 (Thursday)
Date
January 15 is the 15th day of the year in the Gregorian calendar. There are 350 days remaining until the end of the year (351 in leap years).
Contents
1 Events
2 Births
3 Deaths
4 Holidays and observances
5 External links
Events[edit]
AD 69 – Otho seizes power in Rome, proclaiming himself Emperor of Rome, but rules for only three months before committing suicide.
1541 – King Francis I of France gives Jean-François Roberval a commission to settle the province of New France (Canada) and provide for the spread of the "Holy Catholic faith".
1559 – Elizabeth I is crowned Queen of England in Westminster Abbey, London, England.
1582 – Truce of Yam-Zapolsky: Russia cedes Livonia to the Polish–Lithuanian Commonwealth.
1759 – The British Museum opens.
1777 – American Revolutionary War: New Connecticut (present-day Vermont) declares its independence.
1782 – Superintendent of Finance Robert Morris goes before the U.S. Congress to recommend establishment of a national mint and decimal coinage.
1815 – War of 1812: American frigate USS President, commanded by Commodore Stephen Decatur, is captured by a squadron of four British frigates.
1818 – A paper by David Brewster is read to the Royal Society, belatedly announcing his discovery of what we now call the biaxial class of doubly-refracting crystals. On the same day, Augustin-Jean Fresnel signs a "supplement" (submitted four days later) on reflection of polarized light.
1822 – Greek War of Independence: Demetrios Ypsilantis is elected president of the legislative assembly.
1844 – University of Notre Dame receives its charter from the state of Indiana.
1865 – American Civil War: Fort Fisher in North Carolina falls to the Union, thus cutting off the last major seaport of the Confederacy.
1867 – Forty people died when ice covering the boating lake at Regents Park, London, collapsed.
1870 – A political cartoon for the first time symbolizes the Democratic Party with a donkey ("A Live Jackass Kicking a Dead Lion" by Thomas Nast for Harper's Weekly).
1876 – The first newspaper in Afrikaans, Die Afrikaanse Patriot, is published in Paarl.
1889 – The Coca-Cola Company, then known as the Pemberton Medicine Company, is incorporated in Atlanta.
1892 – James Naismith publishes the rules of basketball.
1908 – The Alpha Kappa Alpha sorority becomes the first Greek-letter organization founded and established by African American college women.
1910 – Construction ends on the Buffalo Bill Dam in Wyoming, United States, which was the highest dam in the world at the time, at 325 ft (99 m).
1919 – Rosa Luxemburg and Karl Liebknecht, two of the most prominent socialists in Germany, are tortured and murdered by the Freikorps at the end of the Spartacist uprising.
1919 – Great Molasses Flood: A wave of molasses released from an exploding storage tank sweeps through Boston, Massachusetts, killing 21 and injuring 150.
1934 – The 8.0 Mw Nepal–Bihar earthquake strikes Nepal and Bihar with a maximum Mercalli intensity of XI (Extreme), killing an estimated 6,000–10,700 people.
1936 – The first building to be completely covered in glass, built for the Owens-Illinois Glass Company, is completed in Toledo, Ohio.
1937 – Spanish Civil War: Nationalists and Republican both withdraw after suffering heavy losses, ending the Second Battle of the Corunna Road.
1943 – World War II: The Soviet counter-offensive at Voronezh begins.
1943 – The Pentagon is dedicated in Arlington, Virginia.
1947 – The Black Dahlia murder: the dismembered corpse of Elizabeth Short was found in Los Angeles.
1949 – Chinese Civil War: The Communist forces take over Tianjin from the Nationalist Government.
1962 – The Derveni papyrus, Europe's oldest surviving manuscript dating to 340 BC, is found in northern Greece.
1962 – Netherlands New Guinea Conflict: Indonesian Navy fast patrol boat RI Macan Tutul commanded by Commodore Yos Sudarso sunk in Arafura Sea by the Dutch Navy.
1966 – The First Nigerian Republic, led by Abubakar Tafawa Balewa is overthrown in a military coup d'état.
1967 – The first Super Bowl is played in Los Angeles. The Green Bay Packers defeat the Kansas City Chiefs 35–10.
1969 – The Soviet Union launches Soyuz 5.
1970 – Nigerian Civil War: Biafran rebels surrender following an unsuccessful 32-month fight for independence from Nigeria.
1970 – Muammar Gaddafi is proclaimed premier of Libya.
1973 – Vietnam War: Citing progress in peace negotiations, President Richard Nixon announces the suspension of offensive action in North Vietnam.
1975 – The Alvor Agreement is signed, ending the Angolan War of Independence and giving Angola independence from Portugal.
1976 – Gerald Ford's would-be assassin, Sara Jane Moore, is sentenced to life in prison.
1981 – Pope John Paul II receives a delegation from Solidarity (Polish trade union) at the Vatican led by Lech Wałęsa.
1991 – The United Nations deadline for the withdrawal of Iraqi forces from occupied Kuwait expires, preparing the way for the start of Operation Desert Storm.
1991 – Elizabeth II, in her capacity as Queen of Australia, signs letters patent allowing Australia to become the first Commonwealth realm to institute its own Victoria Cross in its honours system.
2001 – Wikipedia, a free wiki content encyclopedia, goes online.
2005 – ESA's SMART-1 lunar orbiter discovers elements such as calcium, aluminum, silicon, iron, and other surface elements on the Moon.
2007 – Barzan Ibrahim al-Tikriti, former Iraqi intelligence chief and half-brother of Saddam Hussein, and Awad Hamed al-Bandar, former chief judge of the Revolutionary Court, are executed by hanging in Iraq.
2009 – US Airways Flight 1549 ditches safely in the Hudson River after the plane collides with birds several minutes after take-off.
2013 – A train carrying Egyptian Army recruits derails near Giza, Greater Cairo, killing 19 and injuring 120 others.
2015 - The Swiss National Bank abandons the cap on the franc's value relative to the euro, causing turmoil in international financial markets
2016 – The Kenyan Army suffers it worst defeat ever in a battle with Al-Shabaab Islamic insurgents in El-Adde, Somalia. An estimated 150 soldiers die.
Births[edit]
961 – Seongjong of Goryeo, Korean ruler (d. 997)
1432 – Afonso V of Portugal (d. 1481)
1462 – Edzard I, Count of East Frisia, German noble (d. 1528)
1481 – Ashikaga Yoshizumi, Japanese shogun (d. 1511)
1538 – Maeda Toshiie, Japanese general (d. 1599)
1595 – Henry Carey, 2nd Earl of Monmouth, English politician (d. 1661)
1622 – Molière, French actor and playwright (d. 1673)
1623 – Algernon Sidney, British philosopher (d. 1683)
1671 – Abraham de la Pryme, English archaeologist and historian (d. 1704)
1674 – Prosper Jolyot de Crébillon, French poet and playwright (d. 1762)
1716 – Philip Livingston, American merchant and politician (d. 1778)
1747 – John Aikin, English surgeon and author (d. 1822)
1754 – Richard Martin, Irish activist and politician, co-founded the Royal Society for the Prevention of Cruelty to Animals (d. 1834)
1791 – Franz Grillparzer, Austrian author, poet, and playwright (d. 1872)
1795 – Alexander Griboyedov, Russian playwright, composer, and poet (d. 1829)
1803 – Marjorie Fleming, Scottish poet and author (d. 1811)
1809 – Pierre-Joseph Proudhon, French economist and politician (d. 1865)
1812 – Peter Christen Asbjørnsen, Norwegian author and scholar (d. 1885)
1815 – William Bickerton, English-American religious leader, 3rd President of the Church of Jesus Christ (d. 1905)
1834 – Samuel Arza Davenport, American lawyer and politician (d. 1911)
1841 – Frederick Stanley, 16th Earl of Derby, English captain and politician, 6th Governor General of Canada (d. 1908)
1842 – Josef Breuer, Austrian physician and psychiatrist (d. 1925)
1842 – Mary MacKillop, Australian nun and saint, co-founded the Sisters of St Joseph of the Sacred Heart (d. 1909)
1850 – Leonard Darwin, English soldier, eugenicist, and politician (d. 1943)
1850 – Mihai Eminescu, Romanian journalist, author, and poet (d. 1889)
1850 – Sofia Kovalevskaya, Russian-Swedish mathematician and physicist (d. 1891)
1855 – Jacques Damala, Greek-French soldier and actor (d. 1889)
1858 – Giovanni Segantini, Austrian painter (d. 1899)
1859 – Archibald Peake, English-Australian politician, 25th Premier of South Australia (d. 1920)
1863 – Wilhelm Marx, German lawyer and politician, 17th Chancellor of Germany (d. 1946)
1866 – Nathan Söderblom, Swedish archbishop, historian, and academic, Nobel Prize laureate (d. 1931)
1869 – Ruby Laffoon, American lawyer and politician, 43rd Governor of Kentucky (d. 1941)
1869 – Stanisław Wyspiański, Polish poet, playwright, and painter (d. 1907)
1870 – Pierre S. du Pont, American businessman and philanthropist (d. 1954)
1872 – Arsen Kotsoyev, Russian author and translator (d. 1944)
1875 – Thomas Burke, American sprinter, coach, and journalist (d. 1929)
1877 – Lewis Terman, American psychologist, eugenicist, and academic (d. 1956)
1878 – Johanna Müller-Hermann, Austrian composer (d. 1941)
1879 – Mazo de la Roche, Canadian author and playwright (d. 1961)
1882 – Henry Burr, Canadian singer, radio performer, and producer (d. 1941)
1885 – Lorenz Böhler, Austrian physician and author (d. 1973)
1885 – Grover Lowdermilk, American baseball player (d. 1968)
1890 – Michiaki Kamada, Japanese admiral (d. 1947)
1891 – Ray Chapman, American baseball player (d. 1920)
1891 – Osip Mandelstam, Russian poet and translator (d. 1938)
1893 – Ivor Novello, Welsh singer-songwriter and actor (d. 1951)
1895 – Artturi Ilmari Virtanen, Finnish chemist and academic, Nobel Prize laureate (d. 1973)
1896 – Marjorie Bennett, Australian-American actress (d. 1982)
1902 – Nâzım Hikmet, Greek-Turkish author, poet, and playwright (d. 1963)
1902 – Saud of Saudi Arabia (d. 1969)
1903 – Paul A. Dever, American lieutenant and politician, 58th Governor of Massachusetts (d. 1958)
1907 – Janusz Kusociński, Polish runner and soldier (d. 1940)
1908 – Edward Teller, Hungarian-American physicist and academic (d. 2003)
1909 – Jean Bugatti, German-French engineer (d. 1939)
1909 – Gene Krupa, American drummer, composer, and actor (d. 1973)
1912 – Michel Debré, French lawyer and politician, Prime Minister of France (d. 1996)
1913 – Eugène Brands, Dutch painter (d. 2002)
1913 – Lloyd Bridges, American actor (d. 1998)
1913 – Miriam Hyde, Australian pianist and composer (d. 2005)
1913 – Alexander Marinesko, Ukrainian-Russian lieutenant (d. 1963)
1914 – Stefan Bałuk, Polish general (d. 2014)
1914 – Hugh Trevor-Roper, English historian and academic (d. 2003)
1917 – K. A. Thangavelu, Indian film actor and comedian (d. 1994)
1918 – João Figueiredo, Brazilian general and politician, 30th President of Brazil (d. 1999)
1918 – Édouard Gagnon, Canadian cardinal (d. 2007)
1918 – Gamal Abdel Nasser, Egyptian colonel and politician, 2nd President of Egypt (d. 1970)
1919 – Maurice Herzog, French mountaineer and politician, French Minister of Youth Affairs and Sports (d. 2012)
1919 – George Cadle Price, Belizean politician, 1st Prime Minister of Belize (d. 2011)
1920 – Steve Gromek, American baseball player (d. 2002)
1920 – John O'Connor, American cardinal (d. 2000)
1921 – Babasaheb Bhosale, Indian lawyer and politician, 8th Chief Minister of Maharashtra (d. 2007)
1921 – Frank Thornton, English actor (d. 2013)
1922 – Sylvia Lawler, English geneticist (d. 1996)
1922 – Eric Willis, Australian sergeant and politician, 34th Premier of New South Wales (d. 1999)
1923 – Ivor Cutler, Scottish pianist, songwriter, and poet (d. 2006)
1923 – Lee Teng-hui, Taiwanese-Chinese economist and politician, 4th President of the Republic of China
1924 – George Lowe, New Zealand-English mountaineer and explorer (d. 2013)
1925 – Ruth Slenczynska, American pianist and composer
1925 – Ignacio López Tarso, Mexican actor
1926 – Maria Schell, Austrian-Swiss actress (d. 2005)
1927 – Phyllis Coates, American actress
1928 – W. R. Mitchell, English journalist and author (d. 2015)
1929 – Earl Hooker, American guitarist (d. 1970)
1929 – Martin Luther King, Jr., American minister and activist, Nobel Prize laureate (d. 1968)
1930 – Eddie Graham, American wrestler and promoter (d. 1985)
1931 – Lee Bontecou, American painter and sculptor
1932 – Lou Jones, American sprinter (d. 2006)
1933 – Frank Bough, English journalist and radio host
1933 – Ernest J. Gaines, American author and academic
1933 – Peter Maitlis, English chemist and academic
1934 – V. S. Ramadevi, Indian civil servant and politician, 13th Governor of Karnataka (d. 2013)
1937 – Margaret O'Brien, American actress and singer
1938 – Ashraf Aman, Pakistani engineer and mountaineer
1938 – Estrella Blanca, Mexican wrestler
1938 – Chuni Goswami, Indian footballer and cricketer
1939 – Per Ahlmark, Swedish journalist and politician, 1st Deputy Prime Minister of Sweden (d. 2018)
1939 – Tony Bullimore, British sailor
1941 – Captain Beefheart, American singer-songwriter, musician, and artist (d. 2010)
1942 – Frank Joseph Polozola, American academic and judge (d. 2013)
1943 – George Ambrum, Australian rugby league player (d. 1986)
1943 – Margaret Beckett, English metallurgist and politician, Secretary of State for Foreign and Commonwealth Affairs
1943 – Stuart E. Eizenstat, American lawyer and diplomat, United States Ambassador to the European Union
1943 – Mike Marshall, American baseball player
1944 – Jenny Nimmo, English author
1945 – Ko Chun-hsiung, Taiwanese actor, director, and politician (d. 2015)
1945 – Vince Foster, American lawyer and political figure (d. 1993)
1945 – William R. Higgins, American colonel (d. 1990)
1945 – Princess Michael of Kent
1945 – David Pleat, English footballer, manager, and sportscaster
1946 – Charles Brown, American actor (d. 2004)
1947 – Mary Hogg, English lawyer and judge
1947 – Andrea Martin, American-Canadian actress, singer, and screenwriter
1948 – Ronnie Van Zant, American singer-songwriter (d. 1977)
1949 – Luis Alvarado, Puerto Rican-American baseball player (d. 2001)
1949 – Alasdair Liddell, English businessman (d. 2012)
1949 – Ian Stewart, Scottish runner
1949 – Howard Twitty, American golfer
1950 – Marius Trésor, French footballer and coach
1952 – Boris Blank, Swiss singer-songwriter
1952 – Andrzej Fischer, Polish footballer
1953 – Randy White, American football player
1954 – Jose Dalisay, Jr., Filipino poet, author, and screenwriter
1955 – Nigel Benson, English author and illustrator
1955 – Andreas Gursky, German photographer
1955 – Khalid Islambouli, Egyptian lieutenant (d. 1982)
1956 – Vitaly Kaloyev, Russian architect
1956 – Mayawati, Indian educator and politician, 23rd Chief Minister of Uttar Pradesh
1956 – Marc Trestman, American football player and coach
1957 – David Ige, American politician
1957 – Marty Lyons, American football player and sportscaster
1957 – Andrew Tyrie, English journalist and politician
1957 – Mario Van Peebles, American actor and director
1958 – Ken Judge, Australian footballer and coach (d. 2016)
1958 – Boris Tadić, Serbian psychologist and politician, 16th President of Serbia
1959 – Greg Dowling, Australian rugby league player
1959 – Pavle Kozjek, Slovenian mountaineer and photographer (d. 2008)
1959 – Pete Trewavas, English bass player and songwriter
1961 – Serhiy N. Morozov, Ukrainian footballer and coach
1961 – Yves Pelletier, Canadian actor and director
1963 – Conrad Lant, English singer-songwriter and bass player
1963 – Bruce Schneier, American cryptographer and author
1964 – Osmo Tapio Räihälä, Finnish composer
1965 – Maurizio Fondriest, Italian cyclist
1965 – Bernard Hopkins, American boxer and coach
1965 – James Nesbitt, Northern Irish actor
1966 – Lisa Lisa, American R&B singer
1967 – Ted Tryba, American golfer
1968 – Chad Lowe, American actor, director, and producer
1969 – Delino DeShields, American baseball player and manager
1970 – Shane McMahon, American wrestler and businessman
1971 – Regina King, American actress
1972 – Shelia Burrell, American heptathlete
1972 – Christos Kostis, Greek footballer
1972 – Claudia Winkleman, English journalist and critic
1973 – Essam El-Hadary, Egyptian footballer
1973 – Suparno Satpathy, Indian socio-political leader
1974 – Séverine Deneulin, international development academic
1974 – Ray King, American baseball player
1975 – Mary Pierce, Canadian-American tennis player and coach
1976 – Doug Gottlieb, American basketball player and sportscaster
1976 – Iryna Lishchynska, Ukrainian runner
1976 – Scott Murray, Scottish rugby player
1976 – Florentin Petre, Romanian footballer and manager
1978 – Eddie Cahill, American actor
1978 – Franco Pellizotti, Italian cyclist
1978 – Ryan Sidebottom, English cricketer
1979 – Drew Brees, American football player
1979 – Michalis Morfis, Cypriot footballer
1979 – Martin Petrov, Bulgarian footballer
1980 – Matt Holliday, American baseball player
1981 – El Hadji Diouf, Senegalese football player
1981 – Pitbull, American rapper and producer
1981 – Dylan Armstrong, Canadian shot putter and hammer thrower
1981 – Vanessa Henke, German tennis player
1981 – Sean Lamont, Scottish rugby player
1982 – Benjamin Agosto, American skater
1982 – Armando Galarraga, Venezuelan baseball player
1982 – Brett Lebda, American ice hockey player
1982 – Ari Pulkkinen, Finnish pianist and composer
1982 – Francis Zé, Cameroonian footballer
1983 – Jermaine Pennant, English footballer
1983 – Hugo Viana, Portuguese footballer
1984 – Ben Shapiro, American author and columnist
1985 – René Adler, German footballer
1985 – Enrico Patrizio, Italian rugby player
1985 – Kenneth Emil Petersen, Danish footballer
1986 – Fred Davis, American football player
1987 – Greg Inglis, Australian rugby league player
1987 – Tsegaye Kebede, Ethiopian runner
1987 – David Knight, English footballer
1987 – Barbara Blank, American model and former professional wrestler
1987 – Michael Seater, Canadian actor, director, producer, and screenwriter
1988 – Daniel Caligiuri, German footballer
1988 – Skrillex, American DJ and producer
1989 – Alexei Cherepanov, Russian ice hockey player (d. 2008)
1990 – Paul Blake, English sprinter
1990 – Fernando Forestieri, Italian footballer
1990 – Robert Trznadel, Polish footballer
1991 – Marc Bartra, Spanish footballer
1991 – Nicolai Jørgensen, Danish footballer
1991 – Darya Klishina, Russian long jumper
1991 – James Mitchell, Australian basketball player
1992 – Joshua King, Norwegian footballer
1992 – Joël Veltman, Dutch footballer
1994 – Jordy Croux, Belgian footballer
1994 – Eric Dier, English footballer
1995 – Liam Knight, Australian rugby league player
2004 – Grace VanderWaal, American singer
Deaths[edit]
AD 69 – Galba, Roman emperor (b. 3 BC)
348 – Chak Tok Ich'aak I, Mayan ruler (b. 475)
570 – Íte of Killeedy, Irish nun and saint (b. 475)
849 – Theophylact, Byzantine emperor (b. 793)
936 – Rudolph of France (b. 880)
950 – Wang Jingchong, Chinese general
1149 – Berengaria of Barcelona, queen consort of Castile (b. 1116)
1568 – Nicolaus Olahus, Romanian archbishop (b. 1493)
1569 – Catherine Carey, lady-in-waiting to Elizabeth I of England (b. 1524)
1584 – Martha Leijonhufvud, Swedish noblewoman (b. 1520)
1595 – Murad III, Ottoman Sultan (b. 1546)
1623 – Paolo Sarpi, Italian lawyer, historian, and scholar (b. 1552)
1672 – John Cosin, English bishop and academic (b. 1594)
1683 – Philip Warwick, English politician (b. 1609)
1775 – Giovanni Battista Sammartini, Italian organist and composer (b. 1700)
1790 – John Landen, English mathematician and theorist (b. 1719)
1804 – Dru Drury, English entomologist and author (b. 1725)
1813 – Anton Bernolák, Slovak linguist and priest (b. 1762)
1815 – Emma, Lady Hamilton, English-French mistress of Horatio Nelson, 1st Viscount Nelson (b. 1761)
1855 – Henri Braconnot, French chemist and pharmacist (b. 1780)
1864 – Isaac Nathan, English-Australian composer and journalist (b. 1792)
1866 – Massimo d'Azeglio, Piedmontese-Italian statesman, novelist and painter (b. 1798)
1876 – Eliza McCardle Johnson, American wife of Andrew Johnson, 18th First Lady of the United States (b. 1810)
1885 – Leopold Damrosch, German-American composer and conductor (b. 1832)
1893 – Fanny Kemble, English actress (b. 1809)
1896 – Mathew Brady, American photographer and journalist (b. 1822)
1905 – George Thorn, Australian politician, 6th Premier of Queensland (b. 1838)
1909 – Arnold Janssen, German priest and missionary (b. 1837)
1916 – Modest Ilyich Tchaikovsky, Russian playwright and translator (b. 1850)
1919 – Karl Liebknecht, German politician (b. 1871)
1919 – Rosa Luxemburg, German economist, theorist, and philosopher (b. 1871)
1926 – Enrico Toselli, Italian pianist and composer (b. 1883)
1929 – George Cope, American painter (b. 1855)
1936 – Henry Forster, 1st Baron Forster, English cricketer and politician, 7th Governor-General of Australia (b. 1866)
1937 – Anton Holban, Romanian author, theoretician, and educator (b. 1902)
1945 – Wilhelm Wirtinger, Austrian-German mathematician and theorist (b. 1865)
1948 – Josephus Daniels, American publisher and diplomat, 41st United States Secretary of the Navy (b. 1862)
1950 – Henry H. Arnold, American general (b. 1886)
1951 – Ernest Swinton, British Army officer (b. 1868)
1951 – Nikolai Vekšin, Estonian-Russian captain and sailor (b. 1887)
1952 – Ned Hanlon, Australian sergeant and politician, 26th Premier of Queensland (b. 1887)
1955 – Yves Tanguy, French-American painter (b. 1900)
1959 – Regina Margareten, Hungarian businesswoman (b. 1863)
1964 – Jack Teagarden, American singer-songwriter and trombonist (b. 1905)
1967 – David Burliuk, Ukrainian author and illustrator (b. 1882)
1968 – Bill Masterton, Canadian-American ice hockey player (b. 1938)
1970 – Frank Clement, English race car driver (b. 1886)
1970 – William T. Piper, American engineer and businessman, founded Piper Aircraft (b. 1881)
1972 – Daisy Ashford, English author (b. 1881)
1973 – Coleman Francis, American actor, director, and producer (b. 1919)
1973 – Ivan Petrovsky, Russian mathematician and academic (b. 1901)
1974 – Harold D. Cooley, American lawyer and politician (b. 1897)
1981 – Graham Whitehead, English race car driver (b. 1922)
1982 – Red Smith, American journalist (b. 1905)
1983 – Armin Öpik, Estonian-Australian paleontologist and geologist (b. 1898)
1983 – Shepperd Strudwick, American actor (b. 1907)
1984 – Fazıl Küçük, Cypriot journalist and politician (b. 1906)
1987 – Ray Bolger, American actor, singer, and dancer (b. 1904)
1988 – Seán MacBride, Irish republican activist and politician, Minister for Foreign Affairs and Trade, Nobel Prize laureate (b. 1904)
1990 – Gordon Jackson, Scottish-English actor (b. 1923)
1990 – Peggy van Praagh, English ballerina, choreographer, and director (b. 1910)
1993 – Sammy Cahn, American songwriter (b. 1913)
1994 – Georges Cziffra, Hungarian-French pianist and composer (b. 1921)
1994 – Harry Nilsson, American singer-songwriter (b. 1941)
1994 – Harilal Upadhyay, Indian author, poet, and astrologist (b. 1916)
1996 – Les Baxter, American pianist and composer (b. 1922)
1996 – Moshoeshoe II of Lesotho (b. 1938)
1998 – Gulzarilal Nanda, Indian economist and politician, Prime Minister of India (b. 1898)
1998 – Junior Wells, American singer-songwriter and harmonica player (b. 1934)
1999 – Betty Box, English composer and producer (b. 1915)
2000 – Georges-Henri Lévesque, Canadian-Dominican priest and sociologist (b. 1903)
2001 – Leo Marks, English cryptographer, playwright, and screenwriter (b. 1920)
2002 – Michael Anthony Bilandic, American politician, 49th Mayor of Chicago (b. 1923)
2002 – Eugène Brands, Dutch painter (b. 1913)
2003 – Doris Fisher, American singer-songwriter (b. 1915)
2004 – Olivia Goldsmith, American author (b. 1949)
2005 – Victoria de los Ángeles, Spanish soprano and actress (b. 1923)
2005 – Walter Ernsting, German author (b. 1920)
2005 – Elizabeth Janeway, American author and critic (b. 1913)
2005 – Ruth Warrick, American actress (b. 1916)
2006 – Jaber Al-Ahmad Al-Jaber Al-Sabah, Kuwaiti ruler (b. 1926)
2007 – Awad Hamed al-Bandar, Iraqi lawyer and judge (b. 1945)
2007 – Barzan Ibrahim al-Tikriti, Iraqi intelligence officer (b. 1951)
2007 – James Hillier, Canadian-American computer scientist and academic, co-invented the electron microscope (b. 1915)
2007 – Pura Santillan-Castrence, Filipino educator and diplomat (b. 1905)
2007 – Bo Yibo, Chinese commander and politician, Vice Premier of the People's Republic of China (b. 1908)
2008 – Robert V. Bruce, American historian, author, and academic (b. 1923)
2008 – Brad Renfro, American actor (b. 1982)
2009 – Lincoln Verduga Loor, Ecuadorian journalist and politician (b. 1917)
2011 – Nat Lofthouse, English footballer and manager (b. 1925)
2011 – Pierre Louis-Dreyfus, French soldier, race car driver, and businessman (b. 1908)
2011 – Susannah York, English actress and activist (b. 1939)
2012 – Ed Derwinski, American soldier and politician, 1st United States Secretary of Veterans Affairs (b. 1926)
2012 – Manuel Fraga Iribarne, Spanish lawyer and politician, 3rd President of the Xunta of Galicia (b. 1922)
2012 – Carlo Fruttero, Italian journalist and author (b. 1926)
2012 – Samuel Jaskilka, American general (b. 1919)
2012 – Ib Spang Olsen, Danish author and illustrator (b. 1921)
2012 – Hulett C. Smith, American lieutenant and politician, 27th Governor of West Virginia (b. 1918)
2013 – Nagisa Oshima, Japanese director and screenwriter (b. 1932)
2013 – John Thomas, American high jumper (b. 1941)
2014 – Curtis Bray, American football player and coach (b. 1970)
2014 – John Dobson, Chinese-American astronomer and author (b. 1915)
2014 – Roger Lloyd-Pack, English actor (b. 1944)
2015 – Ervin Drake, American songwriter and composer (b. 1919)
2015 – Kim Fowley, American singer-songwriter, producer, and manager (b. 1939)
2015 – Ray Nagel, American football player and coach (b. 1927)
2016 – Francisco X. Alarcón, American poet and educator (b. 1954)
2016 – Ken Judge, Australian footballer and coach (b. 1958)
2016 – Manuel Velázquez, Spanish footballer (b. 1943)
2017 – Jimmy Snuka, Fijian professional wrestler (b. 1943)
2018 – Dolores O'Riordan, Irish pop singer (b. 1971)
Holidays and observances[edit]
Arbor Day (Egypt)
Armed Forces Day (Nigeria)
Army Day (India)
Christian feast day:
Abeluzius (Ethiopian Orthodox Tewahedo Church)
Arnold Janssen
Francis Ferdinand de Capillas (one of Martyr Saints of China)
Ita
Macarius of Egypt (Western Christianity)
Maurus and Placidus (Order of Saint Benedict)
Paul the Hermit
January 15 (Eastern Orthodox liturgics)
Earliest day on which International Fetish Day can fall, while January 21 is the latest; celebrated on the third Friday in January.
Earliest day on which Martin Luther King Jr. Day can fall, while January 21 is the latest; celebrated on the third Monday in January. (United States)
Earliest day on which Sinulog Festival can fall, while January 21 is the latest; celebrated on the third Sunday in January. (Philippines)
John Chilembwe Day (Malawi)
Korean Alphabet Day (North Korea)
Ocean Duty Day (Indonesia)
Sagichō at Tsurugaoka Hachimangū. (Kamakura, Japan)
Teacher's Day (Venezuela)
The second day of the sidereal winter solstice festivals in India (see January 14):
Thai Pongal, Tamil harvest festival
External links[edit]
Wikimedia Commons has media related to January 15.
BBC: On This Day
The New York Times: On This Day
Today in Canadian History
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Related: January 0
February 30
Retrieved from "https://en.wikipedia.org/w/index.php?title=January_15&oldid=852905534"
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values: Ажьырныҳәа 15 – Abkhazian

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https://az.wikipedia.org/wiki/15_yanvar
15 yanvar – Azerbaijani
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https://bcl.wikipedia.org/wiki/Enero_15
Enero 15 – Central Bikol
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15 Genver – Breton
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Enero 15 – Cebuano
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https://cs.wikipedia.org/wiki/15._leden
15. leden – Czech
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15 Ionawr – Welsh
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https://ext.wikipedia.org/wiki/15_eneru
15 eneru – Extremaduran
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values: Туула сарин 15 – Kalmyk

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https://ilo.wikipedia.org/wiki/Enero_15
Enero 15 – Iloko
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15 januar – Interlingue
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Eneru 15 – Pampanga
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15 janvye – Haitian Creole
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Sausio 15 – Lithuanian
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15 01 – Lombard
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15-yanvar – Uzbek
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Metal lathe
From Wikipedia, the free encyclopedia
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Center lathe with digital read out and chuck guard. Size is 460 mm swing x 1000 mm between centers
A metal lathe or metalworking lathe is a large class of lathes designed for precisely machining relatively hard materials. They were originally designed to machine metals; however, with the advent of plastics and other materials, and with their inherent versatility, they are used in a wide range of applications, and a broad range of materials. In machining jargon, where the larger context is already understood, they are usually simply called lathes, or else referred to by more-specific subtype names (toolroom lathe, turret lathe, etc.). These rigid machine tools remove material from a rotating workpiece via the (typically linear) movements of various cutting tools, such as tool bits and drill bits.
Contents
[hide]
1 Construction
1.1 Headstock
1.2 Beds
1.3 Feed and lead screws
1.4 Carriage
1.4.1 Cross-slide
1.4.2 Compound rest
1.4.3 Toolpost
1.5 Tailstock
1.6 Steady, follower and other rests
2 Types of metal lathes
2.1 Center lathe / engine lathe / bench lathe
2.2 Toolroom lathe
2.3 Turret lathe and capstan lathe
2.4 Gang-tool lathe
2.5 Multispindle lathe
2.6 CNC lathe / CNC turning center
2.6.1 CNC Horizontal Milling
2.6.2 CNC Vertical Milling
2.7 Swiss-style lathe / Swiss turning center
2.8 Combination lathe / 3-in-1 machine
2.9 Mini-lathe and micro-lathe
2.10 Wheel lathe
2.11 Pit Lathe
2.12 Brake lathe
2.13 Oil country lathe
3 Feed mechanisms
4 References
5 Bibliography
6 External links
Construction[edit]
The design of lathes can vary greatly depending on the intended application; however, basic features are common to most types. These machines consist of (at the least) a headstock, bed, carriage, and tailstock. Better machines are solidly constructed with broad bearing surfaces (slide-ways) for stability, and manufactured with great precision. This helps ensure the components manufactured on the machines can meet the required tolerances and repeatability.
Headstock[edit]
Headstock with legend, numbers and text within the description refer to those in the image
The headstock (H1) houses the main spindle (H4), speed change mechanism (H2,H3), and change gears (H10). The headstock is required to be made as robust as possible due to the cutting forces involved, which can distort a lightly built housing, and induce harmonic vibrations that will transfer through to the workpiece, reducing the quality of the finished workpiece.
The main spindle is generally hollow to allow long bars to extend through to the work area. This reduces preparation and waste of material. The spindle runs in precision bearings and is fitted with some means of attaching workholding devices such as chucks or faceplates. This end of the spindle usually also has an included taper, frequently a Morse taper, to allow the insertion of hollow tubular (Morse standard) tapers to reduce the size of the tapered hole, and permit use of centers. On older machines ('50s) the spindle was directly driven by a flat belt pulley with lower speeds available by manipulating the bull gear. Later machines use a gear box driven by a dedicated electric motor. A fully 'geared head' allows the operator to select suitable speeds entirely through the gearbox.
Beds[edit]
The bed is a robust base that connects to the headstock and permits the carriage and tailstock to be moved parallel with the axis of the spindle. This is facilitated by hardened and ground bedways which restrain the carriage and tailstock in a set track. The carriage travels by means of a rack and pinion system. The leadscrew of accurate pitch, drives the carriage holding the cutting tool via a gearbox driven from the headstock.
Types of beds include inverted "V" beds, flat beds, and combination "V" and flat beds. "V" and combination beds are used for precision and light duty work, while flat beds are used for heavy duty work.[citation needed]
When a lathe is installed, the first step is to level it, which refers to making sure the bed is not twisted or bowed. There is no need to make the machine exactly horizontal, but it must be entirely untwisted to achieve accurate cutting geometry. A precision level is a useful tool for identifying and removing any twist. It is advisable also to use such a level along the bed to detect bending, in the case of a lathe with more than four mounting points. In both instances the level is used as a comparator rather than an absolute reference.
Feed and lead screws[edit]
The feedscrew (H8) is a long driveshaft that allows a series of gears to drive the carriage mechanisms. These gears are located in the apron of the carriage. Both the feedscrew and leadscrew (H7) are driven by either the change gears (on the quadrant) or an intermediate gearbox known as a quick change gearbox (H6) or Norton gearbox. These intermediate gears allow the correct ratio and direction to be set for cutting threads or worm gears. Tumbler gears (operated by H5) are provided between the spindle and gear train along with a quadrant plate that enables a gear train of the correct ratio and direction to be introduced. This provides a constant relationship between the number of turns the spindle makes, to the number of turns the leadscrew makes. This ratio allows screwthreads to be cut on the workpiece without the aid of a die.
Some lathes have only one leadscrew that serves all carriage-moving purposes. For screw cutting, a half nut is engaged to be driven by the leadscrew's thread; and for general power feed, a key engages with a keyway cut into the leadscrew to drive a pinion along a rack that is mounted along the lathe bed.
The leadscrew will be manufactured to either imperial or metric standards and will require a conversion ratio to be introduced to create thread forms from a different family. To accurately convert from one thread form to the other requires a 127-tooth gear, or on lathes not large enough to mount one, an approximation may be used. Multiples of 3 and 7 giving a ratio of 63:1 can be used to cut fairly loose threads. This conversion ratio is often built into the quick change gearboxes.
The precise ratio required to convert a lathe with an Imperial (inch) leadscrew to metric (millimeter) threading is 100 / 127 = 0.7874... . The best approximation with the fewest total teeth is very often 37 / 47 = 0.7872... . This transposition gives a constant -0.020 percent error over all customary and model-maker's metric pitches (0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.60, 0.70, 0.75, 0.80, 1.00, 1.25, 1.50, 1.75, 2.00, 2.50, 3.00, 3.50, 4.00, 4.50, 5.00, 5.50 and 6.00 mm).
Carriage[edit]
Carriage with legend, numbers and text within the description refer to those in the image
In its simplest form the carriage holds the tool bit and moves it longitudinally (turning) or perpendicularly (facing) under the control of the operator. The operator moves the carriage manually via the handwheel (5a) or automatically by engaging the feed shaft with the carriage feed mechanism (5c). This provides some relief for the operator as the movement of the carriage becomes power assisted. The handwheels (2a, 3b, 5a) on the carriage and its related slides are usually calibrated, both for ease of use and to assist in making reproducible cuts. Calibration marks will measure either the distance from center (radius), or the work piece's diameter, so for example, on a diameter machine where calibration marks are in thousandths of an inch, the radial handwheel dial will read .0005 inches of radius per division, or .001 inches of diameter. The carriage typically comprises a top casting, known as the saddle (4), and a side casting, known as the apron (5).
Cross-slide[edit]
The cross-slide (3) rides on the carriage and has a feedscrew that travels at right angles to the main spindle axis. This permits facing operations to be performed, and the depth of cut to be adjusted. This feedscrew can be engaged, through a gear train, to the feed shaft (mentioned previously) to provide automated 'power feed' movement to the cross-slide. On most lathes, only one direction can be engaged at a time as an interlock mechanism will shut out the second gear train.
Compound rest[edit]
The compound rest (or top slide) (2) is usually where the tool post is mounted. It provides a smaller amount of movement (less than the cross-slide) along its axis via another feedscrew. The compound rest axis can be adjusted independently of the carriage or cross-slide. It is used for turning tapers, to control depth of cut when screwcutting or precision facing, or to obtain finer feeds (under manual control) than the feed shaft permits. Usually, the compound rest has a protractor marked in its base (2b), enabling the operator to adjust its axis to precise angles.
The slide rest (as the earliest forms of carriage were known) can be traced to the fifteenth century. In 1718 the tool-supporting slide rest with a set of gears was introduced by a Russian inventor Andrey Nartov and had limited usage in the Russian industry.[1] In the eighteenth century the slide rest was also used on French ornamental turning lathes. The suite of gun boring mills at the Royal Arsenal, Woolwich, in the 1780s by the Verbruggan family also had slide rests. The story has long circulated that Henry Maudslay invented it, but he did not (and never claimed so). The legend that Maudslay invented the slide rest originated with James Nasmyth, who wrote ambiguously about it in his Remarks on the Introduction of the Slide Principle, 1841; later writers misunderstood, and propagated the error. However, Maudslay did help to disseminate the idea widely. It is highly probable that he saw it when he was working at the Arsenal as a boy. In 1794, whilst he was working for Joseph Bramah, he made one, and when he had his own workshop used it extensively in the lathes he made and sold there. Coupled with the network of engineers he trained, this ensured the slide rest became widely known and copied by other lathe makers, and so diffused throughout British engineering workshops. A practical and versatile screw-cutting lathe incorporating the trio of leadscrew, change gears, and slide rest was Maudslay's most important achievement.
The first fully documented, all-metal slide rest lathe was invented by Jacques de Vaucanson around 1751. It was described in the Encyclopédie a long time before Maudslay invented and perfected his version. It is likely that Maudslay was not aware of Vaucanson's work, since his first versions of the slide rest had many errors that were not present in the Vaucanson lathe.
Toolpost[edit]
The tool bit is mounted in the toolpost (1) which may be of the American lantern style, traditional four-sided square style, or a quick-change style such as the multifix arrangement pictured. The advantage of a quick change set-up is to allow an unlimited number of tools to be used (up to the number of holders available) rather than being limited to one tool with the lantern style, or to four tools with the four-sided type. Interchangeable tool holders allow all tools to be preset to a center height that does not change, even if the holder is removed from the machine.
Tailstock[edit]
Tailstock with legend, numbers and text within the description refer to those in the image
The tailstock is a tool (drill), and centre mount, opposite the headstock. The spindle (T5) does not rotate but does travel longitudinally under the action of a leadscrew and handwheel (T1). The spindle includes a taper to hold drill bits, centers and other tooling. The tailstock can be positioned along the bed and clamped (T6) in position as dictated by the work piece. There is also provision to offset the tailstock (T4) from the spindles axis, this is useful for turning small tapers, and when re-aligning the tailstock to the axis of the bed.
The image shows a reduction gear box (T2) between the handwheel and spindle, where large drills may necessitate the extra leverage. The tool bit is normally made of HSS, cobalt steel or carbide.
Steady, follower and other rests[edit]
Long workpieces often need to be supported in the middle, as cutting tools can push (bend) the work piece away from where the centers can support them, because cutting metal produces tremendous forces that tend to vibrate or even bend the workpiece. This extra support can be provided by a steady rest (also called a steady, a fixed steady, a center rest, or sometimes, confusingly, a center). It stands stationary from a rigid mounting on the bed, and it supports the workpiece at the rest's center, typically with three contact points 120° apart. A follower rest (also called a follower or a travelling steady) is similar, but it is mounted to the carriage rather than the bed, which means that as the tool bit moves, the follower rest "follows along" (because they are both rigidly connected to the same moving carriage).[2][3]
Follower rests can provide support that directly counteracts the springing force of the tool bit, right at the region of the workpiece being cut at any moment. In this respect they are analogous to a box tool. Any rest transfers some workpiece geometry errors from base (bearing surface) to processing surface. It depends on the rest design. For minimum transfer rate correcting rests are used. Rest rollers typically cause some additional geometry errors on the processing surface.
A steady rest
A follower rest
Correcting rest for precision grinding or turning
Play media
Correcting rest work video
Types of metal lathes[edit]
There are many variants of lathes within the metalworking field. Some variations are not all that obvious, and others are more a niche area. For example, a centering lathe is a dual head machine where the work remains fixed and the heads move towards the workpiece and machine a center drill hole into each end. The resulting workpiece may then be used "between centers" in another operation. The usage of the term metal lathe may also be considered somewhat outdated these days, plastics and other composite materials are in wide use and with appropriate modifications, the same principles and techniques may be applied to their machining as that used for metal.
Center lathe / engine lathe / bench lathe[edit]
A typical center lathe
The terms center lathe, engine lathe, and bench lathe all refer to a basic type of lathe that may be considered the archetypical class of metalworking lathe most often used by the general machinist or machining hobbyist. The name bench lathe implies a version of this class small enough to be mounted on a workbench (but still full-featured, and larger than mini-lathes or micro-lathes). The construction of a center lathe is detailed above, but depending on the year of manufacture, size, price range or desired features, even these lathes can vary widely between models.
Engine lathe is the name applied to a traditional late-19th-century or 20th-century lathe with automatic feed to the cutting tool, as opposed to early lathes which were used with hand-held tools, or lathes with manual feed only. The usage of "engine" here is in the mechanical-device sense, not the prime-mover sense, as in the steam engines which were the standard industrial power source for many years. The works would have one large steam engine which would provide power to all the machines via a line shaft system of belts. Therefore, early engine lathes were generally 'cone heads', in that the spindle usually had attached to it a multi-step pulley called a cone pulley designed to accept a flat belt. Different spindle speeds could be obtained by moving the flat belt to different steps on the cone pulley. Cone-head lathes usually had a countershaft (layshaft) on the back side of the cone which could be engaged to provide a lower set of speeds than was obtainable by direct belt drive. These gears were called back gears. Larger lathes sometimes had two-speed back gears which could be shifted to provide a still lower set of speeds.
When electric motors started to become common in the early 20th century, many cone-head lathes were converted to electric power. At the same time the state of the art in gear and bearing practice was advancing to the point that manufacturers began to make fully geared headstocks, using gearboxes analogous to automobile transmissions to obtain various spindle speeds and feed rates while transmitting the higher amounts of power needed to take full advantage of high speed steel tools. Cutting tools evolved once again, with the introduction of man made carbides,and became widely introduced to general industry in the 1970s. Early carbides were attached toolholders by brazing them into a machined 'nest' in the tool holders, later designs allowed tips to be replaceable, and multi faceted, allowing them to be reused. Carbides tolerate much higher machining speeds without wearing. This has led to machining times shortening, and therefore production growing. The demand for faster and more powerful lathes controlled the direction of lathe development.
The availability of inexpensive electronics has again changed the way speed control may be applied by allowing continuously variable motor speed from the maximum down to almost zero RPM. This had been tried in the late 19th century but was not found satisfactory at the time. Subsequent improvements in electric circuitry have made it viable again.
Toolroom lathe[edit]
A toolroom lathe is a lathe optimized for toolroom work. It is essentially just a top-of-the-line center lathe, with all of the best optional features that may be omitted from less expensive models, such as a collet closer, taper attachment, and others. The bed of a toolroom lathe is generally wider than that of a standard centre lathe. There has also been an implication over the years of selective assembly and extra fitting, with every care taken in the building of a toolroom model to make it the smoothest-running, most-accurate version of the machine that can be built. However, within one brand, the quality difference between a regular model and its corresponding toolroom model depends on the builder and in some cases has been partly marketing psychology. For name-brand machine tool builders who made only high-quality tools, there wasn't necessarily any lack of quality in the base-model product for the "luxury model" to improve upon. In other cases, especially when comparing different brands, the quality differential between (1) an entry-level center lathe built to compete on price, and (2) a toolroom lathe meant to compete only on quality and not on price, can be objectively demonstrated by measuring TIR, vibration, etc. In any case, because of their fully ticked-off option list and (real or implied) higher quality, toolroom lathes are more expensive than entry-level center lathes.
Turret lathe and capstan lathe[edit]
Main article: Turret lathe
Turret lathes and capstan lathes are members of a class of lathes that are used for repetitive production of duplicate parts (which by the nature of their cutting process are usually interchangeable). It evolved from earlier lathes with the addition of the turret, which is an indexable toolholder that allows multiple cutting operations to be performed, each with a different cutting tool, in easy, rapid succession, with no need for the operator to perform setup tasks in between (such as installing or uninstalling tools) nor to control the toolpath. (The latter is due to the toolpath's being controlled by the machine, either in jig-like fashion [via the mechanical limits placed on it by the turret's slide and stops] or via IT-directed servomechanisms [on computer numerical controlled (CNC) lathes].)[4]
There is a tremendous variety of turret lathe and capstan lathe designs, reflecting the variety of work that they do.
Gang-tool lathe[edit]
A gang-tool lathe is one that has a row of tools set up on its cross-slide, which is long and flat and is similar to a milling machine table. The idea is essentially the same as with turret lathes: to set up multiple tools and then easily index between them for each part-cutting cycle. Instead of being rotary like a turret, the indexable tool group is linear.
Multispindle lathe[edit]
See also: Screw machine (automatic lathe)
Multispindle lathes have more than one spindle and automated control (whether via cams or CNC). They are production machines specializing in high-volume production. The smaller types are usually called screw machines, while the larger variants are usually called automatic chucking machines, automatic chuckers, or simply chuckers. Screw machines usually work from bar stock, while chuckers automatically chuck up individual blanks from a magazine. Typical minimum profitable production lot size on a screw machine is in the thousands of parts due to the large setup time. Once set up, a screw machine can rapidly and efficiently produce thousands of parts on a continuous basis with high accuracy, low cycle time, and very little human intervention. (The latter two points drive down the unit cost per interchangeable part much lower than could be achieved without these machines.)
CNC lathe / CNC turning center[edit]
CNC lathe with milling capabilities
An example turned vase and view of the tool turret
Computer numerical controlled (CNC) lathes are rapidly replacing the older production lathes (multispindle, etc.) due to their ease of setting, operation, repeatability and accuracy. They are designed to use modern carbide tooling and fully use modern processes. The part may be designed and the tool paths programmed by the CAD/CAM process or manually by the programmer, and the resulting file uploaded to the machine, and once set and trialled the machine will continue to turn out parts under the occasional supervision of an operator.
The machine is controlled electronically via a computer menu style interface, the program may be modified and displayed at the machine, along with a simulated view of the process. The setter/operator needs a high level of skill to perform the process, however the knowledge base is broader compared to the older production machines where intimate knowledge of each machine was considered essential. These machines are often set and operated by the same person, where the operator will supervise a small number of machines (cell).
The design of a CNC lathe varies with different manufacturers, but they all have some common elements. The turret holds the tool holders and indexes them as needed, the spindle holds the workpiece and there are slides that let the turret move in multiple axis simultaneously. The machines are often totally enclosed, due in large part to occupational health and safety (OH&S) issues.
With rapid growth in this industry, different CNC lathe manufacturers use different user interfaces which sometimes makes it difficult for operators as they have to be acquainted with them. With the advent of cheap computers, free operating systems such as Linux, and open source CNC software, the entry price of CNC machines has plummeted.[citation needed]
CNC Horizontal Milling[edit]
CNC horizontal machining is performed using horizontally-configured lathes, machining centers, boring machines, or boring mills. The equipment used typically consists of rotating cylindrical cutters moving up and down along five axes. These machines are capable of producing a variety of shapes, slots, holes, and details on a three-dimensional part.[5]
CNC Vertical Milling[edit]
Vertically-oriented CNC machines utilize cylindrical cutters on a vertical spindle axis to create plunge cuts and drilled holes, as well as custom shapes, slots, and details on three-dimensional parts. Equipment used in this type of milling includes vertical lathes, vertical machining centers, and 5-axis machines.[6]
Swiss-style lathe / Swiss turning center [edit]
A view inside the enclosure of a CNC Swiss-style lathe/screw machine
A Swiss-style lathe is a specific design of lathe providing extreme accuracy (sometimes holding tolerances as small as a few tenths of a thousandth of an inch—a few micrometers). A Swiss-style lathe holds the workpiece with both a collet and a guide bushing. The collet sits behind the guide bushing, and the tools sit in front of the guide bushing, holding stationary on the Z axis. To cut lengthwise along the part, the tools will move in and the material itself will move back and forth along the Z axis. This allows all the work to be done on the material near the guide bushing where it is more rigid, making them ideal for working on slender workpieces as the part is held firmly with little chance of deflection or vibration occurring. This style of lathe is commonly used under CNC control.
Most CNC Swiss-style lathes today use one or two main spindles plus one or two back spindles (secondary spindles). The main spindle is used with the guide bushing for the main machining operations. The secondary spindle is located behind the part, aligned on the Z axis. In simple operation it picks up the part as it is cut off, and accepts it for second operations, then ejects it into a bin, eliminating the need to have an operator manually change each part, as is often the case with standard CNC turning centers. This makes them very efficient, as these machines are capable of fast cycle times, producing simple parts in one cycle (i.e., no need for a second machine to finish the part with second operations), in as little as 10–15 seconds. This makes them ideal for large production runs of small-diameter parts.
Additionally, as many Swiss lathes incorporate a secondary spindle, or 'sub-spindle', they also incorporate 'live tooling'. Live tools are rotary cutting tools that are powered by a small motor independently of the spindle motor(s). Live tools increase the intricacy of components that can be manufactured by the Swiss lathe. For instance, automatically producing a part with a hole drilled perpendicular to the main axis (the axis of rotation of the spindles) is very economical with live tooling, and similarly uneconomical if done as a secondary operation after machining by the Swiss lathe is complete. A 'secondary operation' is a machining operation requiring a partially completed part to be secured in a second machine to complete the manufacturing process. Generally, advanced CAD/CAM software uses live tools in addition to the main spindles so that most parts that can be drawn by a CAD system can actually be manufactured by the machines that the CAD/CAM software support.
Combination lathe / 3-in-1 machine[edit]
A combination lathe, often known as a 3-in-1 machine, introduces drilling or milling operations into the design of the lathe. These machines have a milling column rising up above the lathe bed, and they utilize the carriage and topslide as the X and Y axes for the milling column. The 3-in-1 name comes from the idea of having a lathe, milling machine, and drill press all in one affordable machine tool. These are exclusive to the hobbyist and MRO markets, as they inevitably involve compromises in size, features, rigidity, and precision in order to remain affordable. Nevertheless, they meet the demand of their niche quite well, and are capable of high accuracy given enough time and skill. They may be found in smaller, non-machine-oriented businesses where the occasional small part must be machined, especially where the exacting tolerances of expensive toolroom machines, besides being unaffordable, would be overkill for the application from an engineering perspective.
Mini-lathe and micro-lathe[edit]
Mini-lathes and micro-lathes are miniature versions of a general-purpose center lathe (engine lathe). They typically have swings in the range of 3 to 7 in (76 to 178 mm) diameter (in other words, 1.5 to 3.5 in (38 to 89 mm) radius). They are small and affordable lathes for the home workshop or MRO shop. The same advantages and disadvantages apply to these machines as explained earlier regarding 3-in-1 machines.
As found elsewhere in English-language orthography, there is variation in the styling of the prefixes in these machines' names. They are alternately styled as mini lathe, minilathe, and mini-lathe and as micro lathe, microlathe, and micro-lathe.
Wheel lathe[edit]
Wheel lathes are machines used to manufacture and resurface the wheels of railway cars. When wheels become worn or compromised from excessive use, this tool can be used to re-cut and recondition the wheel of the train car. There are a number of different wheel lathes available including underfloor variations for resurfacing wheels that are still attached to the rail car, portable types that are easily transported for emergency wheel repairs, and CNC versions which utilize computer-based operating systems to complete the wheel repair.[7]
Pit Lathe[edit]
A lathe for large diameter, though short work, built over a recess in the floor to admit the lower part of the workpiece thus allowing the toolrest to stand at the turner's waist height. An example is on display at the London Science Museum, Kensington.
Brake lathe[edit]
A lathe specialized for the task of resurfacing brake drums and discs in automotive or truck garages.
Oil country lathe[edit]
Specialised lathes for machining long workpieces such as segments of drill strings. Oil country lathes are equipped with large-bore hollow spindles, a second chuck on the opposite side of the headstock, and frequently outboard steadies for supporting long workpieces.
Feed mechanisms[edit]
Various feed mechanisms exist to feed material into a lathe at a defined rate.
Bar feeder
A bar feeder feeds a single piece of bar stock into the cutting machine. As each part is machined, the cutting tool creates a final cut to separate the part from the bar stock, and the feeder continues to feed the bar for the next part, allowing for continual operation of the machine. There are two types of bar feeds used in lathe machining: Hydrodynamic bar feeds, which rest the bar stock in a series of channels whilst clamping down on the top and bottom of the bar, and hydrostatic bar feeds, which hold the bar stock in a feed tube using pressurized oil.[8]
Bar loader
A bar loader is a variation on the bar feeder concept in that multiple pieces of bar stock may be fed into a hopper, and the loader feeds each piece as necessary.
References[edit]
Jump up ^ Nartov's biography (in Russian)
Jump up ^ Burghardt 1919, p. 118.
Jump up ^ Arthur R. Meyers,Thomas J. Slattery. Basic Machining Reference Handbook. Second Edition. - Industrial Press Inc., 2001, p. 58
Jump up ^ Parker, Dana T. Building Victory: Aircraft Manufacturing in the Los Angeles Area in World War II, p. 81, 123, Cypress, CA, 2013. ISBN 978-0-9897906-0-4.
Jump up ^ "Horizontal CNC Milling Machines | Ardel Engineering". www.ardelengineering.com. Retrieved 2016-01-11.
Jump up ^ "Vertical CNC Milling Machines | Ardel Engineering". www.ardelengineering.com. Retrieved 2016-01-11.
Jump up ^ "What Is a Wheel Lathe? (with picture)". wiseGEEK. Retrieved 2016-01-11.
Jump up ^ "Bar Feeds : Production Machining". www.productionmachining.com. Retrieved 2016-01-11.
Bibliography[edit]
Burghardt, Henry D. (1919), Machine Tool Operation, 1 (1st ed.), New York, NY, USA: McGraw-Hill, LCCN 20026190.
External links[edit]
Machine Tool Archive
Medieval and Renaissance lathes
The development of the lathe
Spring pole lathe
On ye art and mystery of Turning
Video showing the gang tool concept
Video showing a CNC screw machine cycle
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