Siemens SINUMERIK 840D sl Operating Manual page 193

Parameters for longitudinal thread
Parameter
PL
P
G
Machining
Infeed (only for ∇ and ∇
+ ∇∇∇)
Thread
X0
Z0
Z1
HMI sl Turning
Operating Manual, 01/2008, 6FC5398-7AP10-0BA0
Description
Machining plane:
1)
G18 (ZX)
Thread pitch in mm/revolution
•
Thread pitch in inch/revolution
•
Threads per inch
•
Thread pitch in MODULE
•
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 - P |
e 2 2
G = ----------------- [mm/rev2]
2 * Z
1
The identifiers have the following meanings:
P : End pitch of thread [mm/rev]
e
P: Start pitch of thread [mm/rev]
Z : Thread length [mm]
1
A larger pitch results in a larger distance between the threads on the workpiece.
∇ (roughing)
•
∇∇∇ (finishing)
•
∇ + ∇∇∇ (roughing and finishing)
•
Linear:
•
Infeed with constant cutting depth
Degressive:
•
Infeed with constant cutting cross-section
Internal thread
•
External thread
•
Reference point in X ∅ (abs, always diameter)
Reference point in Z (abs)
End point of the thread (abs) or thread length (inc)
Incremental dimensions: The sign is also evaluated.
Programming a cycle
4.5 Rotate
Unit
mm/rev
in/rev
threads/"
MODULE
mm
mm
mm
193