5
ShopTurn Functions 08/2005
5.3 Turnin
5
♥ Siemens AG, 2005. All rights reserved.
5-206 SINUMERIK 840D sl Operation/Programming ShopTurn (BAT) – 08/2005 Edition
α < 0: Start at front flank
AS Number of roughing cuts or first infeed (for roughing only)
The respective value is displayed when you switch between the number of roughing
cuts and the first infeed.
mm
U Final machining allowance (inc) – (for roughing only) mm
NN Number of non-cuts (finishing only)
To improve the surface finish the tool moves along the thread depth K a further NN
times.
V Return distance (inc) mm
Q Starting angle offset for single-start threads, i.e. angle that determines the initial cut
of the start of thread on the circumference of the turned part (-360°<Q<360°).
E.g. Q = 30.0
The initial cut of the thread is at 30°.
Degrees
Multiple thread
The sequence of motions for single and multiple threads is
fundamentally the same.
¾ Place the cursor on parameter field "Q".
¾ Press the "Alternat." soft key.
Instead of parameter "Q", the parameters for a multiple thread are
displayed.
Parameters Description Unit
L Number of threads (max. 6)
The threads are distributed evenly across the periphery of the turned part; the first
thread is always placed at 0°.
If a multiple thread is to be machined with the first thread not starting at 0°, a cycle
must be programmed for each thread and the appropriate starting angle offset must
be entered for Q.
O Thread changeover depth (inc)
First machine all threads in sequence to thread change depth A, then machine all
threads in sequence to depth 2A, etc., until the final depth is reached.
A=0: Thread changeover depth is not taken into account, i.e. finish machining each
thread before starting the next thread.
mm
N 1 of L threads.
N . 0: only machine thread N
N = 0: machine all threads
P Start thread P = 1 ... L only when N=0
If P > 1, the previous threads are not taken into account.
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