HEIDENHAIN IK 5294 - Manual (Page 108)

88 QC5200 Series User’s Guide
3 Create the datum zero point by
probing the desired point, and then
click OK in the prompt window.
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 bottom
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 the Measure/Line menu item. A description of the line measure-
ment process will be displayed in a prompt window
2 Probe 2 or more
points well distrib-
uted along the entire
left side of the part,
and then click OK in
the prompt window.
The left edge of the part is probed to acquire a line
for the construction of the datum zero
5 Measuring OE.indd 6 5/9/2005 9:59:46 AM