HEIDENHAIN iTNC 530 (340 49x-03) smarT.NC Pilot - Manual (Page 160)

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Zoom function
The TNC features a powerful zoom function for easy recognition of small
details during contour or point selection.
Function Soft key
Magnify workpiece. The TNC always magnifies the
center of the view currently being displayed. Use
the scroll bars to position the drawing in the window
so that the desired section appears after the soft
key has been pressed.
Reduce workpiece
Show workpiece at original size
Move zoomed area upward
Move zoomed area downward
Move zoomed area to the left
Move zoomed area to the right