Siemens SINUMERIK 840D sl Operating Manual page 399

Parameter Description
Z1 Pocket depth (abs) or depth relative to Z0/X0 (inc) – (only for ∇, ∇∇∇ and ∇∇∇ edge)
DXY
Maximum plane infeed

Maximum plane infeed as a percentage of the milling cutter diameter

- (only for ∇ and ∇∇∇)
DZ Maximum depth infeed - (only for ∇, ∇∇∇ and ∇∇∇ edge)
UXY Plane finishing allowance - (only for ∇, ∇∇∇ and ∇∇∇ edge)
UZ Depth finishing allowance – (only for ∇ and ∇∇∇)
Insertion Various insertion modes can be selected – (only for plane-by-plane machining method
and for ∇, ∇∇∇ and ∇∇∇ edge):
Predrilled (only for G code)

Perpendicular: Insert vertically at center of pocket

The tool executes the calculated depth infeed vertically at the center of the pocket.
Feedrate: Infeed rate as programmed under FZ
Helical: Insert along helical path

The cutter center point traverses along the helical path determined by the radius
and depth per revolution. If the depth for one infeed has been reached, a full circle
motion is executed to eliminate the inclined insertion path.
Feedrate: Machining feedrate
Note: The vertical insertion into pocket center method can be used only if the tool
can cut across center or if the workpiece has been predrilled.
Clamp/release spindle (only for end face C/peripheral surface C, if inserted vertically)
The function must be set up by the machine manufacturer.
(only for
ShopTurn)
FZ Depth infeed rate – (for vertical insertion only)
(only for G code)
FZ Depth infeed rate – (for vertical insertion only)
(only for
ShopTurn)
EP Maximum pitch of helix - (for helical insertion only)
The helix pitch may be lower due to the geometrical situation.
ER Radius of helix - (only for helical insertion)
The radius must not be larger than the cutter radius, otherwise material will remain.
Also make sure the circular pocket is not violated
Solid machining
Complete machining

The circular pocket must be milled from a solid workpiece (e.g. casting).
Remachining
(only for G code) 
A small pocket or hole has already been machined in the workpiece, which needs
to be enlarged. Parameters AZ, and ∅1 must be programmed.
Turning
Operating Manual, 02/2012, 6FC5398-8CP40-3BA0
Programming technology functions (cycles)
8.4 Milling
Unit
mm
in
%
mm
mm
mm
*
mm/min
mm/tooth
mm/rev
mm
399