Siemens SINUMERIK 840D sl Operating Manual page 433

Parameter
Parameters, G code program (thread, face)
PL Machining plane
Parameter
P
G
Machining
Milling
Operating Manual, 03/2013, 6FC5398-7CP40-3BA1
Description
DA Thread changeover depth (inc)
First machine all thread turns sequentially to thread changeover
depth DA, then machine all thread turns sequentially to depth 2 ·
DA, etc. until the final depth is reached.
DA = 0: Thread changeover depth is not taken into account, i.e.
finish machining each thread before starting the next thread.
Machining:
Complete, or
•
from turn N1
•
N1 (1...4) start thread N1 = 1...N
only thread NX
•
NX (1...4) 1 from N threads
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 |
e 2 2
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]
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)
•
Programming technological functions (cycles)
]
2
8.4 Turning - only for G code programs
or
Unit
mm
Unit
mm/rev
in/rev
turns/"
MODULUS
mm/rev
2
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