HEIDENHAIN IK 5494-2D - Manual (Page 164)

142 QC5200 Series User’s Guide
The datum zero point will be added
to the Features template and the
coordinate system graphic will be
completed in the Part View win-
dow.
Constructing a datum zero point
The datum zero point can be con-
structed from parent features when
simply probing the desired point is
not possible.
It would not be possible to provide a single description of this process for all measurement applications that
require feature constructions to create a datum zero point. However, the concept illustrated by the example
included here and the construction techniques described later in this chapter can be used to create a datum
zero point for any measurement application.
In this example, a datum zero point is constructed at the intersection points of the X-axis along the bot-
tom of the part (skew axis), and the Y-axis along the left side of the part. This point could not be probed
directly because the left bottom corner includes a radius, and the part is misaligned
in the stage. Errors resulting from the misalignment have already been eliminated by
creating a skew alignment along the bottom of the part. The datum zero point will be
constructed from the X (skew) and Y part axes.
To construct the datum zero point:
1 Click Measure Magic or the Measure/Line menu item. A description of the line
measurement process will be displayed in a prompt window
2 Probe 2 or more points well distributed along
the entire left side of the part, and then click OK in
the prompt window.
The left edge of the part is probed with the Buffer probe
to acquire a line for the construction of a datum zero