Siemens SINUMERIK 840D sl Operating Manual page 561

The tool is moved with rapid traverse to the programmed position, allowing for the return plane
and safety clearance.
Note
Working with rotating tool spindle
For example, if you want to drill very deep holes, you can also employ a rotating tool spindle.
First specify the required tool and tool spindle speed under "Straight/Circle" → "Tool". Then
program the "Drill centered" function.
Note
Stop tool spindle
If, during "Center drilling", the tool spindle does not rotate despite having been previously
activated, then program the "M5" G code command before "Center drilling" in order to stop the
tool spindle.
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 during chipbreaking
1. The tool drills at the programmed feedrate F as far as the first infeed depth.
2. For chipbreaking, the tool retracts by the retraction value V2 and drills as far as the next
infeed depth that can be reduced by the factor DF.
3. Step 2 is repeated until final drilling depth Z1 has been reached and dwell time DT has
expired.
4. The tool retracts to the safety clearance with rapid traverse.
Approach/retraction during stock removal
1. The tool drills at the programmed feedrate F as far as the first infeed depth.
2. The tool is retracted from the workpiece with rapid traverse to the safety clearance for stock
removal and is then re-inserted at the first infeed depth in the automatic mode reduced by
an anticipation distance calculated by the control system.
3. The tool then drills down to the next infeed depth that can be reduced by the factor DF and
the tool retracts again to Z0 + safety clearance for stock removal.
Turning
Operating Manual, 05/2017, A5E40868721
Machine manufacturer
Various defined values can be pre-assigned using setting data.
Please refer to the machine manufacturer's specifications.
Programming technology functions (cycles)
10.7 Additional cycles and functions in ShopTurn
561