Siemens SINUMERIK 840D sl Operating Manual page 546

Programming technology functions (cycles)
10.6 Further cycles and functions
Approaching a machining operation
When approaching the programmed machining operation in the swiveled plane, under worst
case conditions, the software limit switches could be violated. In this case, the system travels
along the software limit switches above the retraction plane. In the event of violation below the
retraction plane, for safety reasons, the program is interrupted with an alarm. To avoid this,
before swiveling, e.g. move the tool in the X/Y plane and position it as close as possible to the
starting point of the machining operation or define the retraction plane closer to the workpiece.
Retraction
Before swiveling the axes you can move the tool to a safe retraction position. The retraction
versions available are defined when starting up the system (commissioning).
The retraction mode is modal. When a tool is changed or after a block search, the retraction
mode last set is used.
Risk of collision
You must select a retraction position that avoids a collision between the tool and workpiece
when swiveling.
Tool
To avoid collisions, you can use the 5-axis transformation (software option) to define the
position of the tool tip during swiveling.
● Correct
The position of the tool tip is corrected during swiveling (tracking function).
● No correction
The position of the tool tip is not corrected (not tracked) during swiveling.
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Machine manufacturer
Please refer to the machine manufacturer's specifications.
WARNING
Machine manufacturer
Please refer to the machine manufacturer's specifications.
Operating Manual, 05/2017, A5E40868721
Turning