HEIDENHAIN IK 5294 - Manual (Page 116)

96 QC5200 Series User’s Guide
Arcs
A minimum of three probed points is required to measure an arc. There is no practical limit to the number
of points that can be probed, and in general accuracy is increased by probing more points.
When the arc is less than 185 degrees, Measure Magic will correctly recognize the
arc feature. However, when the arc is 185 degrees or more, it is likely that Measure
Magic will assign the circle feature type to the data. If the wrong feature type is as-
signed, it can easily be changed by right-clicking the Results window and selecting
the arc feature alternative.
Measurement results are shown in the Features template, Part View window and Results window. The
Results window shows the feature identification number, the number of points used in the measurement,
the radius, diameter and length of the arc, the coordinate location of the center of the arc and the form error.
When only the three required points are probed, the form error is zero. When more than three points are
probed, the form error is the sum of the two greatest opposing error magnitudes.
Click the feature stamp icon
in the left corner of the Re-
sults window to display the
Feature Stamp window. The
arc will be shown with data
point form errors in blue, fil-
tered points in yellow and the
greatest two opposing form
errors in red.
Three points are probed to measure an arc feature
5 Measuring OE.indd 14 5/9/2005 10:00:07 AM