Siemens SINUMERIK 840D Function Manual page 143

DILF= :
LFTXT
LFWP:
ALF= :
LFPOS:
POLFMASK:
POLFMLIN:
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
Define length of retraction path
The value preset during MD configuration (MD21200 $MC_LIFTFAST_DIST)
can be modified in the part program by programming DILF.
Note:
The configured MD value is always active following NC-RESET.
The retraction direction is controlled in conjunction with ALF with G com‐
mands LFTXT and LFWP.
The plane in which the retraction motion is executed is calculated
LFTXT:
from the path tangent and the tool direction (default setting).
The plane in which the retraction motion is executed is the active
LFWP:
working plane.
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.
With LFWP, the direction in the working plane is derived from 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
Further information:
Programming options with ALF are also described in "Traverse direction for
rapid retraction from the contour" in the Programming Manual Advanced.
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 inde‐
pendent 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 rela‐
tion cannot always be established before the lift position is reached.
V1: Feedrates
5.2 Path feedrate F
143