Siemens SINUMERIK 840D

Programming technological functions (cycles)
8.4 Turning - only for G code programs
Milling
Operating Manual, 03/2010, 6FC5398-7CP20-1BA0
371
Parameters, G code program (thread, conical)
PL Machining plane
SC Safety clearance mm
F Feedrate mm/min
Parameters Description Unit
P
 Thread pitch in mm/revolution
 Thread pitch in inch/revolution
 Thread turns per inch
 Thread pitch in MODULUS
mm/rev
in/rev
turns/"
MODULUS
G Change in thread pitch per revolution - (only for P = mm/rev or in/rev)
G = 0: The thread pitch P does not change.
G > 0: The thread pitch P increases by the value G per revolution.
G < 0: The thread pitch P decreases by the value G per revolution.
If the start and end pitch of the thread are known, the pitch change to be
programmed can be calculated as follows:
|P
e
2
- P
2
|
G = ----------------- [mm/rev2]
2 * Z
1
The meanings are as follows:
P
e
: End pitch of thread [mm/rev]
P: Start pitch of thread [mm/rev]
Z
1
: Thread length [mm]
A larger pitch results in a larger distance between the thread turns on the
workpiece.
Machining
 ∇ (roughing)
 ∇∇∇ (finishing)
 ∇ + ∇∇∇ (roughing and finishing)
Infeed (only for ∇ and ∇
+ ∇∇∇)
 Linear:
Infeed with constant cutting depth
 Degressive:
Infeed with constant cutting cross-section
Thread
 Internal thread
 External thread
X0 Reference point X ∅ (abs, always diameter) mm
Z0 Reference point Z (abs) mm
X1 or
X1α
End point X ∅ (abs) or end point in relation to X0 (inc) or
Thread taper
Incremental dimensions: The sign is also evaluated.
mm or
degrees
Z1 End point Z (abs) or end point in relation to Z0 (inc)
Incremental dimension: The sign is also evaluated.
mm