Siemens SINUMERIK 840D sl Operating Manual page 195

Parameter
N
DA
Machining
1) Parameter description refers to plane G18; plane selection G17 or G19 possible in selection field
(MD 52006: $MCS_DISP_PLANE_TURN)!
Parameters for tapered thread
Parameter
PL
P
G
Machining
HMI sl Turning
Operating Manual, 01/2008, 6FC5398-7AP10-0BA0
Description
Number of threads
The threads are distributed evenly across the periphery of the turned part; the first
thread is always placed at 0°.
Thread changeover depth (inc)
First machine all threads in sequence to thread change depth DA, then machine
all threads in sequence 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.
Complete
•
As of thread N1 (1...N)
•
Machine from N1 to N
Only thread -NX (1...N)
•
NX ≠ 0: Only machine thread NX
NX = 0: Machine all threads
Description
Machining plane:
1)
G18 (ZX)
Thread pitch in mm/revolution
•
Thread pitch in inch/revolution
•
Threads per inch
•
Thread pitch in MODULE
•
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/rev2]
2 * Z
1
The identifiers have the following meanings:
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 threads on the workpiece.
∇ (roughing)
•
∇∇∇ (finishing)
•
∇ + ∇∇∇ (roughing and finishing)
•
Programming a cycle
4.5 Rotate
Unit
mm
Unit
mm/rev
in/rev
threads/"
MODULE
195