Siemens SINUMERIK 840D Operating Manual page 302

Programming technological functions (cycles)
8.2 Milling
Machining type
You can select the machining mode for milling the circular spigot as follows:
● Roughing
● Finishing
● Chamfering
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)

Chamfering

Single position
Machining 
position
A circular spigot is machined at the programmed position (X0, Y0, Z0).
Position pattern

Several circular spigots are machined in a position pattern
(e.g. full circle, pitch circle, grid, etc.).
302
Roughing involves moving round the circular spigot until the programmed finishing
allowance has been reached.
If you have programmed a finishing allowance, the circular spigot is moved around until
depth Z1 is reached.
Chamfering involves edge breaking at the upper edge of the circular spigot.
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 "Multi-edge spigot" and "Circular spigot" softkeys.
The "Circular Spigot" 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
Milling