CONTENT 1. 2. 3. 4. 5. 6. 7. 8. 9. What are NC & CNC? History CNC system Elements Properties of CNC machine Types of CNC machines CNC applications Advantages& Disadvantages Conclusion References
What are NC & CNC ? Numerical control (NC) is a method of automatically operating a manufacturing machine based on a code letters, numbers and special characters. The numerical data required to produce a part is provided to a machine in the form of program, called part program or CNC (computer numerical control)
What are NC & CNC ? The program is translated into the appropriate electrical signals for input to motors that run the machine. A CNC machine is an numerical control machine with the added feature of an on board computer. The computer is referred to as the machine control unit (MCU)
HISTORY In 1775, John Wilkinson- cannon boring machine (lathe). In 1881, Eli Whitney- milling machine. In 1947, Mr. John Parsons began experimenting for using 3-axis curvature data to control the machine tool motion for the production for aircraft components. In 1949, parsons- first NC machine. In 1951, MIT was involved in the project. In 1955, after refinements NC became available in industry Today, modern machinery are CNC milling machines and lathes.