Siemens SINUMERIK 840D sl Turning Operating Manual page 369

Parameter Description
DF Infeed:
● Degression amount by which each additional infeed is reduced.
● Percentage for each additional infeed.
DF = 100%: Infeed increment remains constant.
DF < 100%: Infeed increment is reduced in direction of final drilling depth.
Example: Last infeed was 4 mm; DF is 80%
Next infeed = 4 x 80% = 3.2 mm
Next infeed = 3.2 x 80% = 2.56 mm, etc.
V1 Minimum infeed - (only for DF in %)
Parameter V1 is only available if DF<100 has been programmed.
If the infeed increment becomes very small, a minimum infeed can be programmed
in parameter "V1".
V1 < Infeed increment: The tool is inserted by the infeed increment.
V1 > Infeed increment: The tool is inserted by the infeed value programmed under
V1.
V2 Retraction distance after each machining step.
(only for chip Distance by which the drill is retracted for chip breaking.
breaking and
V2 = 0: The tool is not retracted but is left in place for one revolution.
soft first cut "no")
DTB
● Dwell time at drilling depth in seconds
● Dwell time at drilling depth in revolutions
Clearance dis‐
● Manual
tance
The clearance distance must be entered manually.
(only for swarf re‐
● Automatic
moval and soft
The clearance distance is calculated by the cycle.
first cut "no")
V3 – (for "man‐ Clearance distance (inc)
ual" clearance
distance only)
N - (only for Number of chip breaking strokes before each swarf removal operation.
"chip breaking
and swarf re‐
moval")
Retraction for
● Swarf removal at the pilot hole depth
swarf removal
● Swarf removal at the safety clearance
DTS ● Dwell time for swarf removal in seconds
● Dwell time for swarf removal in revolutions
Through drilling
● Yes
Through drilling with feedrate FD
● No
Drilling with constant feedrate
ZD - (only for Depth for through drilling feedrate (abs) or depth for through drilling feedrate in
through drilling relation to Z1 (inc)
"yes")
Turning
Operating Manual, 06/2019, A5E44903486B AB
Programming technology functions (cycles)
10.1 Drilling
Unit
mm
%
mm
mm
s
rev
mm
s
rev
mm
369