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CNC is an acronym for Computerized Numerical Control. This process uses a computer to control a variety of processes in a machine. In these machines, a computer controls the position and engine speed that drives the axes of the machine. This gives the machine more accurate control over more complex shapes than can be made with manual control.

CNC machines are also able to move the tool in all three axis's at the same time. Therefore they can execute three-dimensional trajectories which are required for complex molds and dies.

A computer can also controls the movement of the table, the car and the small spindle. Once programmed, all of the operations are made by machine with no need of operator intervention. This is more productive!

Computer Numerical Control began in the 1950's at MIT where they experimented with the first automated milling machine. Because computers were still new, the computer actually occupied more space than the milling machine. But now computers are small, fast, and economical, so CNC controls have been added to all types of machinery.

Most CNC machine tools are numerically control utilizing a programming technique called g-code. Combining g-code with X,Y,Z,A,B,C,I,J,K values and others, programs can be created to drive controlled motion to the machine tool.

Early programming of complex shapes was more difficult, but the programming languages have become more powerful and easier to program so complex shapes can oftem be programmed relatively easily today.

The advantages of CNC are speed and reproducibility of part production.

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