Siemens SINUMERIK 840D Operating Manual page 281

Parameters, G code program
PL Machining plane
RP Retraction plane
SC Safety clearance
Parameter Description
Single position
Machining 
position (only
Drill hole at programmed position
for G code)
Position pattern

Position with MCALL
F1 Drilling feedrate
Z0 (only for G Reference point Z
code)
Z1 Thread length (inc) or end point of the thread (abs)
D Maximum depth infeed
D ≥ Z1: Infeed to the final drilling depth

D < Z1: Several infeeds with stock removal

Percentage for each additional infeed
DF 
DF=100: Amount of infeed remains constant
DF<100: Amount of infeed 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 provided if DF< 100 has been programmed.
If the amount of infeed becomes very small, a minimum infeed can be programmed in
parameter "V1".
V1 < amount of infeed: The tool is inserted by the infeed amount

V1 > amount of infeed: 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/U: Predrilling feedrate = 0.1 mm/rev
AZ (only for G Predrilling depth with reduced drilling feedrate (inc) - ("yes", only for pre-drilling)
code)
Milling
Operating Manual, 03/2010, 6FC5398-7CP20-1BA0
Parameters, ShopMill program
T
mm D
mm F
S / V
Programming technological functions (cycles)
Tool name
Cutting edge number
Feedrate
Spindle speed or constant
cutting rate
8.1 Drilling
mm/min
mm/rev
rpm
m/min
Unit
mm/min
mm/rev
mm
%
mm
mm
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