Siemens SINUMERIK 840D Operating Manual page 346

Programming technological functions (cycles)
8.3 Contour milling
Predrilling procedure
Parameters, G code program
PRG Name of the program to be generated
PL Machining plane
Milling direction 

RP Retraction plane
SC Safety clearance
F Feedrate
Parameter Description
TR Reference tool Tool, which is used in the "solid machining" machining step. This is
used to determine the plunge position.
Z0 Reference point Z
Z1 Pocket depth (abs) or depth referred to Z0 (inc)
Maximum plane infeed
DXY 
Maximum plane infeed as a percentage of the milling cutter diameter

UXY Finishing allowance, plane
UZ Finishing allowance, depth
Lift mode Lift mode before new infeed
If the machining operation requires several points of insertion, the retraction height can
be programmed:
To retraction plane

Z0 + safety clearance

When making the transition to the next insertion point, the tool returns to this height. If
there are no elements larger than Z0 in the pocket area, "Z0 + safety clearance" can be
selected as the lift mode.
346
1. The part program or ShopMill program to be processed has been
created and you are in the editor.
2. Press the "Cont. mill.", "Predrilling", and "Predrilling" softkeys.
The "Predrilling" input window opens.
Climbing
Conventional
mm
mm
mm/min
Parameters, ShopMill program
T Tool name
D Cutting edge number
F Feedrate
S / V Spindle speed or constant
cutting rate
Operating Manual, 03/2010, 6FC5398-7CP20-1BA0
mm/min
mm/rev
rpm
m/min
Unit
mm
mm
in
%
mm
mm
mm
mm
Milling