Siemens SINUMERIK 840D sl Operating Manual page 337

● With a constant infeed depth, the cutting cross-section increases from cut to cut. The
● With a constant cutting cross-section, the cutting pressure remains constant over all
The feedrate override has no effect during traversing blocks with thread. The spindle
override must not be changed during the thread machining.
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.
Approach/retraction
1. Approach of the starting point determined in the cycle at the beginning of the run-in path
2. Infeed for roughing according to the defined infeed type.
3. Thread cutting is repeated according to the programmed number of roughing cuts.
4. The finishing allowance is removed in the following step with G33.
5. This cut is repeated according to the number of noncuts.
6. The whole sequence of motions is repeated for each further thread.
Procedure for thread chain
Turning
Operating Manual, 03/2013, 6FC5398-8CP40-3BA1
finishing allowance is machined in one cut after roughing.
A constant infeed depth can produce better cutting conditions at small thread depths.
roughing cuts and the infeed depth is reduced.
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.
for the first thread with G0
1. The part program or ShopTurn 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 "Thread chain" softkey.
The "Thread Chain" input window opens.
Programming technology functions (cycles)
8.2 Rotate
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