HEIDENHAIN ND 1300 OED and Crosshair Systems - Manual (Page 135)

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6
Measuring
Circle constructed from multiple features
A circle feature can be constructed from any number of parent features.
The parent features can be any combination of points, slots, rectangles,
arcs and circles. The center points of the parent features will be used to
construct the new circle feature. When more than three parent features
are used, the circle can be constructed using the fitting algorithm of the
user’s choice.
To construct a circle from multiple features:
1 Touch the Measure Circle icon
2 Touch a feature
3 Press the Enter key
4 Repeat steps 2 and 3 for all features
5 Press the Finish key
The best fit circle through the entire collection of features will be constructed.
Constructing Features