Siemens sinumerik 808d Programming And Operating Manual page 120

Cycles
2.4 Drilling cycles
Deep-hole drilling with chip breakage (VARI=0):
● Approach of the reference plane brought forward by the safety clearance by using G0
● Traversing to the first drilling depth with G1, the feedrate for which is derived from the
● Dwell time at final drilling depth (parameter DTB)
● Retraction by 1 mm from the current drilling depth with G1 and the feedrate programmed
● Traversing to the next drilling depth with G1 and the programmed feedrate (sequence of
motions is continued until the final drilling depth is reached)
● Retraction to the retraction plane with G0
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feedrate defined with the program call which is subject to parameter FRF (feedrate factor)
in the calling program (for chip breaking)
Turning Part 2: Programming (Siemens instructions)
Programming and Operating Manual, 05/2012, 6FC5398-5DP10-0BA0