Siemens SINUMERIK 808D Programming And Operating Manual page 127

R: Distance from the initial plane to plane R
Q: Single drilling depth
F: Feedrate
K: Number of repetitions
High-speed deep hole drilling cycle with chip breakage (G73):
Explanations
On using the G73 cycle, the retraction motion takes place after the drilling with rapid traverse. The safety clearance can be
specified with GUD _ZSFR[0]. The retraction amount from chip breaking (d) is defined with GUD _ZSFR[1]:
_ZSFR[1] > 0 Retraction amount as input
_ZSFR[1] = 0 Retraction amount in chip breaking is always 1 mm
The in-feed takes place by using the cutting depth for each cutting Q which is incremented with the retraction amount d as
second in-feed.
A rapid drilling infeed results with this drilling cycle. Chip removal takes place through the retraction motion.
Restrictions
None.
Programming and Operating Manual (ISO Turning/Milling)
127
01/2017