Siemens SINUMERIK 840DE

Programming Motion Commands
4.19 Stop with thread cutting(LFOF, LFON, LFTXT, LFWP, LFPOS)
Fundamentals
Programming Manual, 10.2004 Edition, 6FC5 298-7AB00-0BP1
4-65
Description
Retraction direction (ALF)
The retraction direction in connection with ALF is controlled using the following keywords:
• LFTXT
The plane in which the fast retraction is executed is calculated from the path tangent and
the tool direction (default setting).
• LFWP
The plane in which the fast retraction is executed is the active working plane.
• LFPOS
Retraction of the axis declared with POLFMASK to the absolute axis position
programmed with POLF. See also NC controlled retraction in the functional description
FB3, M3.
ALF has no influence on the lifting direction on several axes and also on several axes in
linear relation.
In the plane of the retraction movement as previously with ALF the direction is programmed
in discrete steps of
degrees. With LFTXT, the retraction is defined in the tool direction 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 X direction
ALF=3 Retraction in Y direction
• G18: Z/X plane
ALF=1 Retraction in Z direction
ALF=3 Retraction in X direction
• G19: Y/Z plane
ALF=1 Retraction in Y direction
ALF=3 Retraction in Z direction
Retraction speed
Retraction with maximum axis speed.
Can be configured via machine data.
The maximum permissible acceleration/jerk values are used for traversing; they are
configured via the machine data.
Further information
POLF with POLFMASK/POLFMLIN are not restricted to thread cutting applications. See also
functional description Fb3, M3.