HEIDENHAIN TNC 620 (81760x-02) Cycle programming - Manual (Page 158)

Fixed Cycles: Pocket Milling / Stud Milling / Slot Milling
5.7 CIRCULAR STUD (Cycle 257, DIN/ISO: G257, software option 19)
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TNC 620 | User's Manual Cycle Programming | 2/2015
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!
The TNC performs an approach motion in this cycle!
Depending on the starting angle Q376, the following
amount of space must be left next to the stud: At
least tool diameter + 2 mm. Danger of collision!
At the end, the TNC positions the tool back to the
set-up clearance, or to the 2nd set-up clearance if
one was programmed. The end position of the tool
after the cycle differs from the starting position!