Siemens SINUMERIK 840D sl Operating Manual page 482

Programming technological functions (cycles)
10.4 Turning - milling/turning machine
For metric threads (thread pitch P in mm/rev), the cycle assigns a value (calculated on the
basis of the thread pitch) to the thread depth H1 parameter. You can change this value.
The default must be activated via setting data SD 55212
$SCS_FUNCTION_MASK_TECH_SET.
The cycle requires a speed-controlled spindle with a position measuring system.
Interruption of thread cutting
You have the option to interrupt thread cutting (for example if the cutting tool is broken).
1. Press the <CYCLE STOP> key.
The tool is retracted from the thread and the spindle is stopped.
2. Replace the tool and press the <CYCLE START> key.
The aborted thread cutting is started again with the interrupted cut at the same depth.
Thread re-machining
You have the option of subsequently machining threads. To do this, change into the "JOG"
operating mode and carry out a thread synchronization.
Input simple
For simple machining operations, you have the option to reduce the wide variety of parameters
to the most important parameters using the "Input" selection field. In this "Input simple" mode,
the hidden parameters are allocated a fixed value that cannot be adjusted.
If the workpiece programming requires it, you can display and change all of the parameters
using "Input complete".
Approach/retraction
1. The tool moves to the starting point calculated internally in the cycle at rapid traverse.
2. Thread with advance:
The tool moves at rapid traverse to the first starting position displaced by the thread advance
LW.
Thread with run-in:
The tool moves at rapid traverse to the starting position displaced by the thread run-in LW2.
3. The first cut is made with thread pitch P as far as the thread run-out LR.
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Machine manufacturer
Please refer to the machine manufacturer's specifications.
Machine manufacturer
Various defined values can be pre-assigned using setting data.
Please refer to the machine manufacturer's specifications.
Operating Manual, 05/2017, A5E40868956
Milling