HEIDENHAIN TNC 640 (34059x-04) Cycle programming - Manual (Page 112)

Fixed Cycles: Tapping / Thread Milling
4.4 TAPPING WITH CHIP BREAKING (Cycle 209, DIN/ISO: G209)
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TNC 640 | User's Manual Cycle Programming | 3/2014
RPM factor for retraction Q403: Factor by
which the TNC increases the spindle speed—
and therefore also the retraction feed rate—when
retracting from the drill hole. Input range 0.0001 to
10 Maximum increase to maximum speed of the
active gear range
Retracting after a program interruption
If you interrupt program run during thread cutting with the machine
stop button, the TNC will display the
MANUAL OPERATION soft
key. If you press the MANUAL OPERATION key, you can retract the
tool under program control. Simply press the positive axis direction
button of the active spindle axis.