Siemens SINUMERIK 840D sl Operating Manual page 431

Parameter
Table
Selection - (not for
table "Without")
P
G
Machining
Infeed (only for ∇ and ∇
+ ∇∇∇)
Thread
X0
Z0
Milling
Operating Manual, 03/2013, 6FC5398-7CP40-3BA1
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 |
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)
•
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)
Programming technological functions (cycles)
]
2
8.4 Turning - only for G code programs
Unit
mm/rev
in/rev
turns/"
MODULUS
mm/rev
2
mm
mm
431