Siemens SINUMERIK 840D sl Operating Manual page 332

Programming technology functions (cycles)
8.2 Rotate
Parameter
P
G
Machining
Infeed (only for ∇ and ∇
+ ∇∇∇)
Thread
X0
Z0
X1 or
X1α
Z1
332
Description
Thread pitch in mm/revolution
•
Thread pitch in inch/revolution
•
Thread turns per inch
•
Thread pitch in MODULUS
•
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 |
2 2
e
G = ----------------- [mm/rev2]
2 * Z
1
The meanings are as follows:
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 thread turns 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 X ∅ (abs, always diameter)
Reference point Z (abs)
End point X ∅ (abs) or end point in relation to X0 (inc) or
Thread taper
Incremental dimensions: The sign is also evaluated.
End point Z (abs) or end point in relation to Z0 (inc)
Incremental dimensions: The sign is also evaluated.
Operating Manual, 03/2013, 6FC5398-8CP40-3BA1
Unit
mm/rev
in/rev
turns/"
MODULUS
mm/rev
2
mm
mm
mm or
degrees
mm
Turning