HEIDENHAIN TNC 640 User Manual page 167

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Fixed Cycles: Pocket Milling / Stud Milling / Slot Milling | CIRCULAR POCKET (Cycle 252, DIN/ISO: G252)

Danger of collision!

If you enter a positive depth with a cycle, the TNC reverses

calculation of the pre-positioning. This means that the tool

moves at rapid traverse in the tool axis to set-up clearance

the workpiece surface!

Enter depth as negative

Enter in machine parameter displayDepthErr (No. 201003)

whether the TNC should output an error message (on) or not

(off) if a positive depth is entered

Danger of collision!

If you call the cycle with machining operation 2 (only finishing),

then the tool is positioned to the first plunging depth + set-up

clearance at rapid traverse. There is a danger of collision during

positioning at rapid traverse.

Perform roughing beforehand

Ensure that the TNC can pre-position the tool at rapid traverse

without colliding with the workpiece

HEIDENHAIN | User's manual for cycle programming | 10/2017