HEIDENHAIN iTNC 530 (340 49x-02) Pilot - Manual (Page 140)

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Selecting a reference point on a single element
8 Select the mode for specifying the reference point.
8 Click the element on which you want to set the reference
point with the left mouse button. The TNC indicates
possible locations for reference points on the selected
element with stars.
8 Click the star you want to select as reference point. The TNC
sets the reference-point symbol to the selected location.
Use the zoom function if the selected element is too small.
Selecting a reference point on the intersection of two elements
8 Select the mode for specifying the reference point.
8 Click the first element (straight line, complete circle or
circular arc) with the left mouse button. The TNC indicates
possible locations for reference points on the selected
element with stars.
8 Click the second element (straight line, complete circle or
circular arc) with the left mouse button. The TNC sets the
reference-point symbol on the intersection.
The TNC calculates the intersection of two elements even
it is on the extension of one of these elements.
If the TNC calculates multiple intersections, it selects the
intersection nearest the mouse-click on the second
element.
If the TNC cannot calculate an intersection, it rescinds the
marking of the first element.