Siemens SINUMERIK 840D sl Operating Manual page 476

Programming technology functions (cycles)
8.6 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.
Swivel plane (only for G code programming)
● New
● Additive
If the currently active WO contains rotations, e.g., due to previous workpiece measuring
operations, they will be taken into account in the swivel cycle.
476
Machine manufacturer
Please refer to the machine manufacturer's specifications.
WARNING
Previous swivel frames and programmed frames are deleted and a new swivel frame is
formed according to the values specified in the input screen.
Every main program must begin with a swivel cycle with the new swivel plane, in order to
ensure that a swivel frame from another program is not active.
The swivel frame is added to the swivel frame from the last swivel cycle.
If several swivel cycles are programmed in a program and programmable frames are also
active between them (e.g., AROT ATRANS), these are taken into account in the swivel
frame.
Operating Manual, 03/2013, 6FC5398-8CP40-3BA1
Turning