Siemens SINUMERIK 828D Operating Manual page 368

Programming technology functions (cycles)
9.2 Rotate
Parameter "Longitudinal thread" in the "Input complete" mode
G-code program parameters
Input
PL Machining plane
Parameter
Table
Selection - (not for
table "Without")
P
G
368
Complete
•
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 pro-
grammed can be calculated as follows:
|P - P |
2 2
e
G = ----------------- [mm/rev
2 * Z
1
The meanings are as follows:
P : End pitch of thread [mm/rev]
e
P : Start pitch of thread [mm/rev]
a
Z : Thread length [mm]
1
A larger pitch results in a larger distance between the thread turns on the work-
piece.
Parameters, ShopTurn program
T Tool name
D Cutting edge number
S / V Spindle speed or constant cut-
ting rate
]
2
Operating Manual, 01/2015, 6FC5398-8CP40-5BA2
rpm
m/min
Unit
mm/rev
in/rev
turns/"
MODULUS
mm/rev
2
Turning