FACTOID # 14: North Carolina has a larger Native American population than North Dakota, South Dakota and Montana combined.
 
 Home   Encyclopedia   Statistics   States A-Z   Flags   Maps   FAQ   About 
   
 
WHAT'S NEW
 

SEARCH ALL

FACTS & STATISTICS    Advanced view

Search encyclopedia, statistics and forums:

 

 

(* = Graphable)

 

 


Encyclopedia > Machine tooling

A machine tool is a powered mechanical device, typically used to fabricate metal components of machines by the selective removal of metal. The term machine tool is usually reserved for tools that used a power source other than human movement, but they can be powered by people if appropriately set up. Many historians of technology consider that the true machine tools were born when direct human involvement was removed from the shaping or stamping process of the different kinds of tools. For instance, they consider that lathe machine tools were invented around 1751 by Jacques de Vaucanson because he was the first to mount the cutting instrument on a mechanically adjustable head, taking it out of the hands of the operator. Binomial name Homo sapiens Linnaeus, 1758 Subspecies Homo sapiens idaltu (extinct) Homo sapiens sapiens For other uses, see Human (disambiguation). ... Events Adam Smith is appointed professor of logic at the University of Glasgow March 31 - The future King George III of the United Kingdom succeeds his father as Prince of Wales. ... Jacques de Vaucanson. ...


Machine tools can be powered from a variety of sources. Human and animal power are options, as is energy captured through the use of waterwheels. However, machine tools really began to develop after the development of the steam engine, leading to the Industrial Revolution. Today, most are powered by electricity. Phyla Porifera (sponges) Ctenophora (comb jellies) Cnidaria Placozoa Subregnum Bilateria  Acoelomorpha  Orthonectida  Rhombozoa  Myxozoa  Superphylum Deuterostomia     Chordata (vertebrates, etc. ... An overshot water wheel standing 42 feet high powers the Old Mill at Berry College in Rome, Georgia A water wheel (also waterwheel, Norse mill, Persian wheel or noria) is a hydropower system; a system for extracting power from a flow of water. ... A steam engine is a heat engine that makes use of the thermal energy that exists in steam, converting it to mechanical work. ... The Industrial Revolution was the major technological, socioeconomic and cultural change in the late 18th and early 19th century resulting from the replacement of an economy based on manual labor to one dominated by industry and machine manufacture. ... Electricity is the term the early scientists used when they were actually referring to charge. Present usage of the term electricity has become confused. ...


Machine tools can be operated manually, or under automatic control. Early machines used flywheels to stabilize their motion and had complex systems of gears and levers to control the machine and the piece being worked on. Soon after World War II, the NC, or numerical control, machine was developed. NC machines used a series of numbers punched on paper tape or punch cards to control their motion. In the 1960s, computers were added to give even more flexibility to the process. Such machines became known as CNC, or computer numerical control, machines. NC and CNC machines could precisely repeat sequences over and over, and could produce much more complex pieces than even the most skilled tool operators. Spoked flywheel A flywheel is a heavy rotating disk used as a repository for angular momentum. ... World War II was a truly global conflict with many facets: immense human suffering, fierce indoctrinations, and the use of new, extremely devastating weapons such as the atom bomb World War II, also known as the Second World War, was a mid-20th-century conflict that engulfed much of the... Numerical control or numerically controlled (NC) machine tools are machines that are automatically operated based on commands that are fed into them. ... A roll of punched tape Punched tape is an old-fashioned form of data storage, consisting of a long strip of paper in which holes are punched to store data. ... The punch card (or Hollerith card) is a recording medium for holding information for use by automated data processing machines. ... The 1960s, or The Sixties, in its most obvious sense refers to the decade between 1960 and 1969, but the expression has taken on a wider meaning over the past twenty years. ... A computer is a device or machine for processing information from data according to a program — a compiled list of instructions. ... A CNC Turning Center The abbreviation CNC stands for Computer(ized) Numerical(ly) Control(led), and refers specifically to the computer control of machine tools for the purpose of (repeatedly) manufacturing complex parts in metal as well as other materials, using a program written in a notation conforming to the...


Before long, the machines could automatically change the specific cutting and shaping tools that were being used. For example, a drill machine might contain a magazine with a variety of drill bits for producing holes of various sizes. Previously, either machine operators would usually have to manually change the bit or move the work piece to another station to perform these different operations. The next logical step was to combine several different machine tools together, all under computer control. These are known as machine centers, and have dramatically changed the way parts are made. // Hand tools A bit and brace, a hand-powered drill. ... A collection of magazines A magazine is a periodical publication containing a variety of articles. ... Drill bits are the cutters of drill tools. ...


Today, it is possible to design a complex part on a computer, put a bar or rod into a machine center, and have a finished part within a matter of minutes.


Examples of machine tools are:

When fabricating or shaping parts, several techniques are used to remove unwanted metal. Among these are: // Hand tools A bit and brace, a hand-powered drill. ... A hobbing machine is a special form of milling machine that mills gears. ... This article is about a lathe as a tool. ... A Milling machine is a power-driven machine used for the complex shaping of metal (or possibly other materials) parts. ... A shaper is a machine tool used for shaping metal and other materials. ... A Stewart platform is a kind of manipulator using an octahedral assembly of struts. ... Rotating abrasive wheel on a bench grinder. ...

Several regions of the United States became centers for machine tool development, including Cincinnati, Ohio and Springfield, Vermont. Electrical discharge machining (or EDM) is a method of working extremely hard materials or materials that are difficult to machine cleanly using conventional methods. ... Cincinnati is a city in southwestern Ohio, United States that lies on the Ohio River and is the county seat of Hamilton County6. ... Springfield, Vermont Springfield is a town located in Windsor County, Vermont. ...


  Results from FactBites:
 
Cavco Machine Tool Rebuilding - Machinery Rebuilders, Machine Tool Rebuilders, Retrofitting, and Repair,CNC, Way ... (598 words)
Machines that are rebuilt by Cavco Machine Tool Rebuilding are Guaranteed for 1 year.
Machine tool repair is another service that we supplie.
Machine tool rebuilding and rebuilding of machine tools on-site has been performed by us for 28 years.
Lathes - Machine Tool Directory, Machine Tool Manufacturers, Machine Tool Dealers, CNC Lathes (1661 words)
lathe machine qnt 3, spindle bore 52-65mm,admit betwwen centre 1500mm.
for shaping machine, gould and eberhardt: tool head for key cutting machine, lunn davies,model 15:broaching cutter set metric ranging from 6mm-38mm and imperial equivalents with adaptors.
horizontal machining center with moving column, and having all the axes on the moving column.
  More results at FactBites »

 
 

COMMENTARY     


Share your thoughts, questions and commentary here
Your name
Your comments

Want to know more?
Search encyclopedia, statistics and forums:

 


Press Releases |  Feeds | Contact
The Wikipedia article included on this page is licensed under the GFDL.
Images may be subject to relevant owners' copyright.
All other elements are (c) copyright NationMaster.com 2003-5. All Rights Reserved.
Usage implies agreement with terms, 1022, m