Programming of CNC Machines
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Ken Evans. Programming of CNC Machines
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FOURTH EDITION
Programming of
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The operator’s manual supplied with the machine should be consulted to identify where this location is and how to properly home the machine.
The second zero point can be located anywhere within the machine work envelope and is called Workpiece Zero; it is used as the basis for programmed coordinate values used to produce the workpiece. It is established within the part program by a special code and the coordinates are taken from the distance from the Machine Zero point. The code number in the program identifies the location of offset values to the machine control where the exact coordinate distance of the X, Y, and Z axes of Workpiece Zero is in relationship to the Machine Zero. All dimensional data on the part will be established by accurately setting the Workpiece Zero. A way of looking at the Workpiece Zero is like another coordinate system within the machine coordinate system, established by the Home position.
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