Discuss the two reference point systems used to position tools in a CNC machine for work on a part.
What will be an ideal response?
In absolute positioning, all process locations are given as distances from a zero point (datum). Each move the tool makes is given as a distance and direction from the zero point as would be the case in tabular and ordinate dimensioning. The second method is called incremental positioning, which uses successive dimensions or chain dimensions, Figure 28-3. Each move of the tool moves a specific distance and direction from its present location to the next location without returning to zero.
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