Siemens SINUMERIK 840D Programming Manual page 58

Drilling Cycles and Drilling Patterns
2
2.1 Drilling cycles
_DTD
real
_DIS1
real
Function
The tool drills at the programmed spindle speed and
feedrate to the programmed final drilling depth.
Deep hole drilling is performed with a depth infeed of a
maximum definable depth executed several times,
increasing gradually until the final drilling depth is
reached.
The drill can either be retracted to the reference
plane+safety clearance after every infeed depth for
swarf removal or retracted in each case by 1 mm for
chip breaking.
2-58
Dwell time at final drilling depth
Values: > 0 in seconds
< 0 in revolutions
= 0 value as for DTB
Programmable limit distance on re-insertion in hole (VARI=1 for swarf
removal)
Values: > 0 programmable value applies
= 0 automatic calculation
SINUMERIK 840D/840Di/810D/FM-NC Programming Guide, Cycles (PGZ) - 04.00 Edition
03.96
04.00
2
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