Lifting On Retraction (Lftxt, Lfwp, Lfpos, Polf, Polfmask; Polfmlin) - Siemens SINUMERIK 840DE Programming Manual

Trigger criteria for retraction
• Fast inputs, programmable with SETINT LIFTFAST (if LIFTFAST option is enabled)
• NC Stop/NC Reset
If fast retraction is enabled with LFON, it is active for every movement
Retraction path (DILF)
The retraction path can be defined in the machine data or by programming. After NC Reset,
the value in MD 21200: LIFTFAST_DIST is still active.
Retraction direction (ALF)
The retraction direction is controlled in conjunction with ALF with vocabulary words LFTXT,
LFWP and LFPOS . With LFTXT, the retraction is defined in the tool direction for ALF=1.
LFTXT (tangential lifting in tool direction) is set as default. See "Lifting in retraction with
LFTXT, LFWP, LFPOS, POLF, POLFMADK and POLFMLIN"..
4.19.2

Lifting on retraction (LFTXT, LFWP, LFPOS, POLF, POLFMASK; POLFMLIN)

Function
With the LFTXT, LFWP, LFPOS; POLF commands you can selectively program on lifting the
retraction processing from the lift movement up to the lift position. The following are
programmed:
• Retraction direction from the path tangent or the active working plane
• Retraction direction toward position programmed
• Absolute retraction position
In this case for a certain period the axis relation of the programmed path or the linear lift
movement are not guaranteed each time. The linear relation cannot always be produced
according to the dynamic behavior of all participating axes up to reaching the lift position.
Axes can be enabled for the independent retraction to axis position and to axis position with
linear relation.
Programming
LFTXT
Or
LFWP
Or
LFPOS
Or
Fundamentals
Programming Manual, 10.2004 Edition, 6FC5 298-7AB00-0BP1
4.19 Stop with thread cutting(LFOF, LFON, LFTXT, LFWP, LFPOS)
Programming Motion Commands
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