Siemens Sinumerik 840D sl Programming Manual page 226

Motion commands
10.10 Thread cutting
ALF= :
LFPOS:
POLFMASK:
POLFMLIN:
POLF[]:
<axis
identifier>:
Note
LFON or LFOF can always be programmed, but the evaluation is performed exclusively during
thread cutting (G33).
Note
POLF with POLFMASK/POLFMLIN are not restricted to thread cutting applications.
226
The direction is programmed in discrete degree increments with ALF in the plane of
the retraction motion.
With LFTXT, retraction in the tool direction is defined for ALF=1.
For LFWP, the direction in the working/machining plane has the following assignment:
● G17 (X/Y plane)
ALF=1 ; Retraction in the X direction
ALF=3 ; Retraction in the Y direction
● G18 (Z/X plane)
ALF=1 ; Retraction in the Z direction
ALF=3 ; Retraction in the X direction
● G19 (Y/Z plane)
ALF=1 ; Retraction in the Y direction
ALF=3 ; Retraction in the Z direction
References:
Programming options with ALF are also described in "Traverse direction for rapid
retraction from the contour" in the Programming Manual, Job Planning.
Retraction of the axis declared with POLFMASK or POLFMLIN to the absolute axis
position programmed with POLF.
Release of axes (<axis 1 name>,<axis 1 name>, etc.) for independent
retraction to absolute position.
Release of axes for retraction to absolute position in linear relation
Note:
Depending on the dynamic response of all the axes involved, the linear relation can‐
not always be established before the lift position is reached.
Define absolute retraction position for the geometry axis or machine axis in the index
Effective: Modal
In the case of geometry axes, the assigned value is interpreted
=<value>:
as a position in the workpiece coordinate system. In the case of
machine axes, it is interpreted as a position in the machine coor‐
dinate system.
The values assigned can also be programmed as incremental di‐
mensions:
=IC<value>
Identifier of a geometry axis or machine axis.
Programming Manual, 01/2015, 6FC5398-1BP40-5BA2
Fundamentals