Siemens SINUMERIK 840D sl Operating Manual page 338

Programming technology functions (cycles)
8.2 Rotate
Parameters, G code program (thread, longitudinal)
PL Machining plane
Parameter
Table
Selection - (not for
table "Without")
P
G
Machining
338
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)

Parameters, ShopTurn program (thread, longitudinal)
T Tool name
D Cutting edge number
S / V Spindle speed or constant
cutting rate
Operating Manual, 02/2012, 6FC5398-8CP40-3BA0
rpm
m/min
Unit
mm/rev
in/rev
turns/"
MODULUS
mm/rev
2
Turning