Siemens SINUMERIK 840D sl Operating Manual page 344

Programming technology functions (cycles)
8.2 Rotate
Parameter
Machining
Infeed (only for ∇ and ∇
+ ∇∇∇)
Thread
X0
Z0
X1
LW
or
LW2
or
LW2 = LR
LR
H1
DP
or
αP
344
Description
∇ (roughing)

∇∇∇ (finishing)

∇ + ∇∇∇ (roughing and finishing)

Linear:

Infeed with constant cutting depth
Degressive:

Infeed with constant cutting cross-section
Internal thread

External thread

Reference point X ∅ (abs, always diameter)
Reference point Z (abs)
End point of the thread ∅ (abs) or thread length (inc)
Incremental dimensions: The sign is also evaluated.
Thread advance (inc)
The starting point for the thread is the reference point (X0, Z0) brought forward by
the thread advance W. The thread advance can be used if you wish to begin the
individual cuts slightly earlier in order to also produce a precise start of thread.
Thread run-in (inc)
The thread run-in can be used if you cannot approach the thread from the side and
instead have to insert the tool into the material (e.g. lubrication groove on a shaft).
Thread run-in = thread run-out (inc)
Thread run-out (inc)
The thread run-out can be used if you wish to retract the tool obliquely at the end
of the thread (e.g. lubrication groove on a shaft).
Thread depth (inc)
Infeed slope as flank (inc) – (alternative to infeed slope as angle)
DP > 0: Infeed along the rear flank
DP < 0: Infeed along the front flank
Infeed slope as angle – (alternative to infeed slope as flank)
α > 0: Infeed along the rear flank
α < 0: Infeed along the front flank
α = 0: Infeed at right angle to cutting direction
If you wish to infeed along the flanks, the maximum absolute value of this
parameter may be half the flank angle of the tool.
Infeed along the flank
Infeed with alternating flanks (alternative)
Instead of infeed along one flank, you can infeed along alternating flanks to avoid
always loading the same tool cutting edge. This means that you can increase the
tool life.
α > 0: Start at the rear flank
α < 0: Start at the front flank
Operating Manual, 02/2012, 6FC5398-8CP40-3BA0
Unit
mm
mm
mm
mm
mm
mm
mm
mm
Degrees
Turning