The concept of modern numerical control (NC) - the predecessor of computerized numerical control (CNC) was originally conceived today c.947 by John T. Parsons (1913-2007) and Frank L. Shtulen (1921-2010)) in the rotating wing section of the propeller laboratory in the Air Force Wright-Patterson in Dayton, Ohio, as a result of a search by the United States Air Force (USF) to design and produce more (Source: CNC machining history: how the CNC concept emerged, CMS North America, Inc.). At the beginning, Parsons and Stulen developed a helicopter blade pattern making system using the IBM 602A multiplier to calculate the aerodynamic profile and coordinates and feeds data directly to a Swiss jigger, which impressed their USAF research collection. Shortly thereafter, Parsons and Shtulen developed a unique computerized punch card program to create complex three-dimensional shapes, which led Parsons to start his own company, Parson Corp., operating in Traverse City, Michigan.
In 1948, US Air Force representatives visited the headquarters of Parsons Corp., and Parsons was contracted to develop new and innovative wing designs for military applications. This, in turn, led to a series of research projects by the US Air Force at the Massachusetts Institute of Technology's servomechanism laboratory (Massachusetts Institute of Technology), culminating in the construction of the very first naturally controlled, although uncomfortable, prototype machine. To do this, Parsons acquired a 28-inch contour milling machine with a Cincinnati DK cylindrical spinner, consisting of a table and a spindle that moved along the X, Y and Z axes. Over the next two years, Cincinnati was disassembled, significantly modified, modified and assembled. As research on applications continued, the prototype was added to create head, table or cross-slide motion with an accuracy of 0.0005 "for each electrical impulse given by the director. In response to the movement, synchronous motors aimed at each movement created a voltage This voltage was sent back to the detector for comparison with the original command voltage.
By 1953, enough data had been selected to offer practical, aeronautical applications and a Cincinnati prototype that used the Frieden flash drive with an 8-column paper tape, tape, and vacuum tube control system, became the actual prototype for all successful developments. Until now, all CNC machines, even the most complex ones, still require three main systems to operate: a command function system, a drive / drive system, and a feedback system.
Although CNC gained slow recognition during the 50s, in 1958 the MIT Servomechanisms laboratory developed the g-code, which became the most universal language for working with CNC.
In the early standard, the electronic industry alliance (EIA) standardized g-code and computer-aided design (CAD) became an emerging technology that provided a more solid basis for the technology. As a result, the CNC took off and began to steadily push out the old technology.
By the 1980s, minicomputers, such as the DEC PDP-8 and Data General Nova, made CNC machines more powerful and economical. American companies responsible for the revolution of CNC, focused on high-quality equipment. German and Japanese companies that feel the need have begun to produce smaller, less expensive CNC machines, and since 1979 they have surpassed the United States.
Finally, PCs have now made the control of the CNC even cheaper, giving way to using CNC machines for hobby and general purpose markets. The CNC control language, now known as LinuxCNC (previously known as Enhanced Machine Controller, or EMC2), continues to evolve, like many other CNC technologies.
Job:
“CNC machining history: how the CNC concept appeared”, CMS North America, Inc., http://www.cmsna.com/blog/2013/01/history-of-cnc-machining-how-the-cnc -concept- born-born /
