Siemens sinumerik 840D sl Operating Manual page 293

Parameters
Table
Selection - (not for
table "Without")
P
G
Machining
Infeed (only for ∇ and ∇
+ ∇∇∇)
Thread
X0
Z0
Z1
Turning
Operating Manual, 07/2010, 6FC5398-8CP40-0BA0
Description
Thread table selection:
without

ISO metric

Whitworth BSW

Whitworth BSP

UNC

Data, table value, e.g. M10, M12, M14, ...
Select the thread pitch / turns for table "without" or specify the thread pitch/turns
corresponding to the selection in the thread table:
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 from thread table ∅ (abs)
Reference point Z (abs)
End point of the thread (abs) or thread length (inc)
Incremental dimensions: The sign is also evaluated.
Programming technology functions (cycles)
8.2 Rotate
Unit
mm/rev
in/rev
turns/"
MODULUS
mm
mm
mm
293