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#1 Income Generating Computer Business In 2003
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Computer-aided machining
Computer numerical control (CNC)
Altering the operating procedures of early NC systems
required changing the hardware of the machine tool
itself. In the 1970s CNC systems, controlled by
dedicated mini- or microcomputers, were developed to
enable machine tools to be readily adapted to different
jobs by altering the control program, or software.
Consequently, CNC machine tools are easier to operate
and more versatile than their NC counterparts, and their
programming is simpler and can be rapidly tested. Since
they have less control hardware, they are cheaper to
maintain and are generally more accurate. CNC systems
can be used with a wide range of machine tools such as
milling machines and lathes. Many are equipped with
graphic displays that plot the shapes of the components
being machined. Some simulate tool movements, while
others produce three-dimensional views of components.
When several CNC machine tools receive instructions
for machining from a large central computer that
stores and processes operational procedures, they are
said to be under direct numerical control (DNC).
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