Siemens SINUMERIK 840D sl Operating Manual page 339

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 provided 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
● Automatic
removal and
The clearance distance is calculated by the cycle.
soft 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
ZD - (only for Depth for through drilling feedrate (abs) or depth for through drilling feedrate in rela‐
through drilling tion to Z1 (inc)
"yes")
Milling
Operating Manual, 05/2017, A5E40868956
Programming technological functions (cycles)
10.1 Drilling
Unit
mm
%
mm
mm
s
rev
mm
s
rev
mm
339