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what is the difference between NC & CNC machine.what is the
difference between equipment & machine tool.
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Answer Posted / ydna
NC machines include any automated device that executes a program using some type of symbolically-encoded input [not controlled via computer]. Examples include a music box, programmable loom machine, player piano, relay logic, analog alarm clocks, older voting machines, analog-controlled household furnaces, or mechanisms driven by cams/gears/sectors/rotors. NC machines have existed long before computers were invented, and in many cases before electricity was harnessed.
The *only* difference with a CNC machine is that a computer was added to facilitate the program and control method. CNC machines are a therefore a subcategory of NC, whereby a computer is utilized. Many types of NC machines are outdated in current-day times, and have been converted to CNC. Examples include computerized fabrication machines, PLCs, industrial robots, vehicle autopilot systems, and many others.
The type of programming method is irrevelant unless a computer is utilized. If there's a computer, it's CNC. If there is not a computer: the program is run using another method, which makes it only NC. See the above for examples of both.
Each and every automated machine that existed prior to the invention of the computer are, by definition, NC. However, many have been updated in modern times. For instance, NC-controlled milling machines were used in the production of automobiles before transistors were invented. Currently most automated mills are CNC-controlled, but it does not mean all automated milling machines are now or have always been CNC.
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