Siemens SINUMERIK 828D Operating Manual page 378

Programming technology functions (cycles)
9.2 Rotate
Parameter "Face thread" in the "Input complete" mode
G-code program parameters
Input
PL Machining plane
Parameter
P
G
Machining
Infeed (only for ∇ and ∇
+ ∇∇∇)
Thread
X0
Z0
378
Complete
•
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 pro-
grammed can be calculated as follows:
|P - P |
e 2 2
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 work-
piece.
∇ (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 ∅ (abs, always diameter)
Reference point Z (abs)
Parameters, ShopTurn program
T Tool name
D Cutting edge number
S / V Spindle speed or constant cut-
ting rate
Operating Manual, 01/2015, 6FC5398-8CP40-5BA2
rpm
m/min
Unit
mm/rev
in/rev
turns/"
MODULUS
mm/rev
2
mm
mm
Turning