HEIDENHAIN TNC 128 (77184x-02) - Manual (Page 430)

Fixed cycles: Pocket milling / stud milling
17.2 RECTANGULAR POCKET (Cycle 251)
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TNC 128 | User's Manual HEIDENHAIN Conversational Programming | 5/2014
Danger of collision!
Use the machine parameter
displayDepthErr to
define whether, if a positive depth is entered, the
TNC should output an error message (on) or not (off).
Keep in mind that the TNC reverses the calculation
for pre-positioning when a
positive depth is
entered . This means that the tool moves at rapid
traverse in the tool axis to set-up clearance below
the workpiece surface!