Siemens SINUMERIK 840D Operating Manual page 310

Programming technological functions (cycles)
8.2 Milling
Procedure
Parameters, G code program
PL Machining plane
Milling direction
RP Retraction plane
SC Safety clearance
F Feedrate
Parameter Description
FZ Depth infeed rate
(only for G code)
∇ (roughing)
Machining 
∇∇∇ (finishing)

∇ + ∇∇∇ (roughing and finishing) - (only for ShopMill)

∇∇∇ edge (edge finishing) - (only for G code)

Chamfering

FZ Depth infeed rate - (only for ∇ and ∇∇∇)
Full circle
Circular pattern 
The circumferential grooves are positioned around a full circle. The groove spacing
is uniform and is calculated by the controller.
Pitch circle

The circumferential grooves are positioned around a pitch circle. The groove
spacing can be determined on the basis of angle α2.
The positions refer to the center point:
X0 Reference point X
Y0 Reference point Y
Z0 Reference point Z
N Number of grooves
R Radius of circumferential groove
α0 Starting angle
α1 Opening angle of the groove
α2 Advance angle - (for pitch circle only)
310
1. The part program or ShopMill program to be processed has been
created and you are in the editor.
2. Press the "Milling" softkey.
3. Press the "Groove" and "Circumferential groove" softkeys.
The "Circumferential Groove" input window opens.
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/min
in/tooth
mm/min
mm
mm
mm
mm
Degrees
Degrees
Degrees
Milling