HEIDENHAIN IK 5394-3D - Manual (Page 114)

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Chapter 2 Quick Start
To construct a nearest distance
Step 1
Highlight circles 3 and 6 in the features list as shown.
NOTE
Hold down the control (ctrl) key to select items that are
not sequential in the features list.
Step 2
Click the distance button on the measure toolbar.
Step 3
Click OK in the dialog box.