HEIDENHAIN TNC 640 (34059x-04) Cycle programming - Manual (Page 109)

TAPPING WITH CHIP BREAKING (Cycle 209, DIN/ISO: G209) 4.4
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TNC 640 | User's Manual Cycle Programming | 3/2014
109
4.4 TAPPING WITH CHIP BREAKING (Cycle
209, DIN/ISO: G209)
Cycle run
The TNC machines the thread in several passes until it reaches the
programmed depth. You can define in a parameter whether the tool
is to be retracted completely from the hole for chip breaking.
1 The TNC positions the tool in the tool axis at rapid traverse
FMAX to the programmed set-up clearance above the workpiece
surface. There it carries out an oriented spindle stop.
2 The tool moves to the programmed infeed depth, reverses the
direction of spindle rotation and retracts by a specific distance
or completely for chip release, depending on the definition. If
you have defined a factor for increasing the spindle speed, the
TNC retracts from the hole at the corresponding speed.
3 It then reverses the direction of spindle rotation again and
advances to the next infeed depth.
4 The TNC repeats this process (2 to 3) until the programmed
thread depth is reached.
5 The tool is then retracted to set-up clearance. If programmed,
the tool moves to the 2nd set-up clearance at
FMAX.
6 The TNC stops the spindle turning at set-up clearance.