Siemens SINUMERIK 840D Programming Manual page 74

2
Drilling Cycles and Drilling Patterns
2.1 Drilling cycles
Example:
Programming the values REP=0, SDIS=0, DP=-40, FDEP=-10,
DAM=-0.8 and MDEP=5 results in the following drilling strokes:
-10
-18
-29.4, -29.52
-39.52
-37.26, -40
DTB (dwell time)
The dwell time at final drilling depth (chip breaking) is
programmed in DTB in seconds or revolutions of the
main spindle.
Ø 0 in seconds
< 0 in revolutions
DTS (dwell time)
The dwell time at the starting point is only performed
if VARI=1 (swarf removal).
Ø Value > 0 in seconds
Value < 0 in revolutions
FRF (feedrate factor)
With this parameter you can enter a reduction factor for
the active feedrate which only applies to the approach
to the first drilling depth in the cycle.
VARI (machining mode)
If parameter VARI=0 is set, the drill retracts 1mm after
reaching each drilling depth for chip breaking. When
VARI=1 (for swarf removal), the drill traverses in each
case to the reference plane moved forward by the
safety distance.
2-74
corresponds to the first drilling depth
the incremental difference 8 corresponds to 0.8 *of the first
drilling depth
in each case the previous drilling depth * degression factor
minimum drilling depth MDEP takes effect
remaining depth divided into two cuts.
SINUMERIK 840D/840Di/810D Programming Guide Cycles (PGZ) – 11.02 Edition
2
03.96
11.02
© Siemens AG, 2002. All rights reserved