Siemens SINUMERIK Series Operating Manual page 536

Programming technological functions (cycles)
10.4 Turning - milling/turning machine
4. Thread with advance:
The tool moves at rapid traverse to the return distance VR and then to the next starting
position.
Thread with run-in:
The tool moves at rapid traverse to the return distance VR and then back to the starting
position.
5. Steps 3 and 4 are repeated until the thread is finished.
6. The tool moves back to the retraction plane at rapid traverse.
Thread machining can be stopped at any time with the "Rapid lift" function. It ensures that the
tool does not damage the thread when it is raised.
Start and end of thread
At the start of the thread, a distinction is made between thread lead (parameter LW) and thread
run-in (parameter LW2).
If you program a thread lead, the programmed starting point is moved forward by this amount.
You use the thread lead if the thread starts outside the material, for example, on the shoulder
of a turned part.
If you program a thread run-in, an additional thread block is generated internally in the cycle.
The thread block is inserted in front of the actual thread on which the tool is inserted. You
require thread run-in if you want to cut a thread on the middle of a shaft.
If you program a thread run-out > 0, an additional thread block is generated at the end of the
thread.
Note
Commands DITS and DITE
In CYCLE99, the commands DITS and DITE are not programmed. The setting data SD 42010
$SC_THREAD_RAMP_DISP[0] and [1] are not changed.
The parameters thread run-in (LW2) and thread run-out (LR) used in the cycles have a purely
geometrical meaning. They do not influence the dynamic response of the thread blocks. The
parameters result internally in a concatenation of several thread blocks.
Procedure for longitudinal thread, tapered thread, or face thread
536
1. The part program or ShopMill program to be processed has been created
and you are in the editor.
2. Press the "Turning" softkey.
3. Press the "Thread" softkey.
The "Thread" input window opens.
4. Press the "Longitudinal thread" softkey.
The "Longitudinal Thread" input window opens.
- OR -
Operating Manual, 08/2018, 6FC5398-7CP41-0BA0
Milling