Siemens SINUMERIK 840D sl Turning Operating Manual page 383

Parameters Description
D Maximum depth infeed
DF
● Percentage for each additional infeed
DF=100: Infeed increment remains constant
DF<100: Infeed increment is reduced in direction of final drilling depth Z1.
Example: last infeed 4 mm; DF 80%
next infeed = 4 x 80% = 3.2 mm
next but one infeed = 3.2 x 80% = 2.56 mm etc.
● Amount for each additional infeed
V1 Minimum infeed - (only for DF, percentage for each additional infeed)
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.
Predrilling Predrilling with reduced feedrate
● Yes
● No
The reduced drilling feedrate is obtained as follows:
Drilling feedrate F1 < 0.15 mm/rev: Predrilling feedrate = 30% of F1
Drilling feedrate F1 ≥ 0.15 mm/rev: Predrilling feedrate = 0.1 mm/rev
AZ Predrilling depth with reduced drilling feedrate - ("yes", only for predrilling)
(only for G code)
Through boring Remaining drilling depth with drilling feedrate
● Yes
● No
ZR Residual drilling depth for through boring - ("yes", only for through boring)
FR Drilling feedrate for remaining drilling depth - ("yes", only for through boring)
Chip removal Stock removal before thread milling
● Yes
● No
Return to workpiece surface for stock removal before thread milling.
Thread Direction of rotation of the thread
● Righthand thread
● Lefthand thread
F2 Feedrate for thread milling
Table Thread table selection:
● without
● ISO metric
● Whitworth BSW
● Whitworth BSP
● UNC
Turning
Operating Manual, 06/2019, A5E44903486B AB
Programming technology functions (cycles)
10.1 Drilling
Unit
mm
%
mm
mm
mm
mm
mm/min
mm/rev
mm/min
mm/tooth
383