Siemens SINUMERIK 840D Operating Manual page 272

Programming technological functions (cycles)
8.1 Drilling
Parameter Description
Single position
Machining 
position
Drill hole at programmed position.
(only for G
Position pattern

code)
Position with MCALL
Z0 (only for G Reference point Z
code)
Stock removal
Machining 
The drill is retracted from the workpiece for stock removal.
Chipbreaking

The drill is retracted by the retraction distance V2 for chipbreaking.
Shank (drilling depth in relation to the shank)
Drilling depth 
The drill is inserted into the workpiece until the drill shank reaches the value
programmed for Z1. The angle entered in the tool list is taken into account.
Tip (drilling depth in relation to the tip)

The drill is inserted into the workpiece until the drill tip reaches the value
programmed for Z1.
Z1 Drilling depth (abs) or drilling depth in relation to Z0 (inc)
It is inserted into the workpiece until it reaches Z1.
D - (only for G 1. Drilling depth (abs) or 1st drilling depth in relation to Z0 (inc)
code)
D - (only for Maximum depth infeed
ShopMill)
FD1 Percentage for the feedrate for the first infeed
DF Infeed:
Amount for each additional infeed

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 provided only if DF< 100 has been programmed.
If the infeed increment becomes minimal, 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 – (for chipbreaking only)
Distance by which the drill is retracted for chipbreaking.
V2 = 0: The tool is not retracted but is left in place for one revolution.
V3 Clearance distance – (for stock removal only and manual clearance distance)
Distance to the last infeed depth that the drill approaches in rapid traverse after stock
removal.
272
Operating Manual, 03/2010, 6FC5398-7CP20-1BA0
Unit
mm
mm
%
mm
%
mm
mm
Milling