POSITIP 880 13
I – 1 Fundamentals of Positioning
Setting the Datum
The workpiece drawing (Fig. I.3) identifies a certain point on the
workpiece (usually a corner) as the absolute datum and perhaps one
or more other points as relative datums.
The datum setting procedure establishes these points as the origin of
the absolute or relative coordinate systems: The workpiece, which is
aligned with the machine axes, is moved to a certain position relative
to the tool and the display is set either to zero or to another appropriate
value (e.g., to compensate the tool radius).
Example:
Drawing with several relative datums (ISO 129 or DIN 406 Part 11,
Fig. 171)
Fig. I.3 The workpiece datum represents the origin
of the Cartesian coordinate system
To Next Page
Loading...
