Siemens sinumerik 840D sl Operating Manual page 366

Programming technology functions (cycles)
8.4 Milling
Parameter Description
∇ (roughing)
Machining 
∇∇ (pre-finishing)

∇∇∇ (finishing)

∇∇∇ base (base finishing)

∇∇∇ edge (edge finishing)

Chamfering

Vortex milling
Technology 
The milling cutter performs circular motions along the length of the slot and back
again.
Plunge cutting

Sequential drilling motion along the tool axis.
Milling direction: - (except plunge cutting).
Climbing

Conventional

Single position
Machining 
position
Mill a slot at the programmed position (X0, Y0, Z0).
Position pattern

Mill slots at a programmed position pattern (e.g. full circle or grid).
Default: The positions refer to the reference point:
X0 Reference point X – (only for single position)
Y0 Reference point Y – (only for single position)
Z0 Reference point Z – (only for single position)
(only for G code)
Face C: The positions refer to the reference point:
X0 Reference point X – (only for single position)
Y0 Reference point Y – (only for single position)
Z0 Reference point Z – (only for single position)
(only for
ShopTurn)
Face Y: The positions refer to the reference point:
CP Positioning angle for machining area – (only single position)
X0 or L0 Reference point X or reference point length polar – (only for single position)
Y0 or C0 Reference point Y or reference point angle polar – (only for single position)
Z0 Reference point Z – (only for single position)
(only for
ShopTurn)
Peripheral surface C: The positions refer to the reference point:
Y0 or C0 Reference point Y or reference point angle polar – (only for single position)
Z0 Reference point Z – (only for single position)
X0 Cylinder diameter ∅ – (only for single position)
(only for
ShopTurn)
366
Operating Manual, 07/2010, 6FC5398-8CP40-0BA0
Unit
mm
mm
mm
mm
mm
mm
Degrees
mm
mm or
degrees
mm
mm or
degrees
mm
mm
Turning