Thread Turning (Cycle99); Function - Siemens SINUMERIK 840D sl Operating Manual

8.4.6

Thread turning (CYCLE99)

8.4.6.1

Function

Function
The "Longitudinal thread", "Tapered thread" or "Face thread" cycle is used to turn external or
internal threads with a constant or variable pitch.
There may be single or multiple threads.
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.
2. Replace the tool and press the <CYCLE START> key.
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.
Approach/retraction
1. The tool moves to the starting point calculated internally in the cycle at rapid traverse.
2. Thread with advance:
Milling
Operating Manual, 03/2013, 6FC5398-7CP40-3BA1
Machine manufacturer
Please refer to the machine manufacturer's specifications.
The tool is retracted from the thread and the spindle is stopped.
The aborted thread cutting is started again with the interrupted cut at the same depth.
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.
Programming technological functions (cycles)
8.4 Turning - only for G code programs
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