HEIDENHAIN iTNC 530 (340 49x-06) Pilot - Manual (Page 198)

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Individual selection
U Select the mode for choosing a machining position. The TNC
hides the layers shown in the left window, and the right
window becomes active for position selection.
U In order to select a machining position, click the desired
element with the left mouse button. The TNC indicates
possible locations for machining positions on the selected
element with stars. Click one of the stars: The TNC loads the
selected position into the left window (displays a point
symbol). If you click a circle, the TNC adopts the circle
center as machining position.
U If necessary you can also deselect elements that you already
selected, by clicking the element in the right window again,
but this time while pressing the CTRL key (click inside the
marked area).
U If you want to specify the machining position at the
intersection of two elements, click the first element with the
right mouse button: the TNC displays stars at the selectable
machining positions.
U Click the second element (straight line, complete circle or
circular arc) with the left mouse button. The TNC loads the
intersection of the elements into the left window (displays a
point symbol).