Fast Retraction For Thread Cutting (Lfon, Lfof, Dilf, Alf, Lftxt, Lfwp, Lfpos, Polf, Polfmask, Polfmlin) - Siemens SINUMERIK 840D sl Programming Manual

9.14 Fast retraction for thread cutting (LFON, LFOF, DILF, ALF, LFTXT, LFWP, LFPOS, POLF, POLFMASK,
9.14 Fast retraction for thread cutting (LFON, LFOF, DILF, ALF, LFTXT,
LFWP, LFPOS, POLF, POLFMASK, POLFMLIN)
Function
The "Fast retraction for thread cutting (G33)" function can be used to interrupt thread cutting
without causing irreparable damage in the following circumstances:
• NC Stop/NC RESET
• Switching of a rapid input (see "Fast retraction from the contour" in the Programming
Manual, Job Planning)
Retraction movement to a specific retraction position can be programmed by:
• Specifying the length of the retraction path and the retraction distance
or
• Specifying an absolute retraction position
Fast retraction cannot be used in the context of tapping (G331/G332).
Syntax
Fast retraction for thread cutting with specification of the length of the retraction path and the
retraction direction:
G33 ... LFON DILF=<value> LFTXT/LFWP ALF=<value>
Fast retraction for thread cutting with specification of an absolute retraction position:
POLF[<geometry axis name>/<machine axis name>]=<value> LFPOS
POLFMASK/POLFMLIN(<axis 1 name>,<axis 2 name>, etc.)
G33 ... LFON
Disable fast retraction for thread cutting:
LFOF
Significance
LFON:
LFOF:
DILF= :
Fundamentals
Programming Manual, 09/2011, 6FC5398-1BP40-2BA0
Enable fast retraction for thread cutting (G33)
Disable fast retraction for thread cutting (G33)
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.
Motion commands
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