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
4-61
N10 G1 X0 Y0 Z2 S200 F1000 M3 ;Approach starting point, activate
spindle
N20 G63 Z-50 F160 ;Tap, drilling depth 50
N30 G63 Z3 M4 ;Retract, programmed reversal of
direction
N40 M30 ;End of program
4.19 Stop with thread cutting(LFOF, LFON, LFTXT, LFWP, LFPOS)
4.19.1 Retraction for thread cutting (LFOF, LFON, LIFTFAST, DILF, ALF)
Function
The function produces a nondestructive interruption with thread cutting (G33). The function
cannot be used with tapping (G33). With mixed use of both G33 functions, the response can
be parameterized for NC Stop/NC Reset via the machine data. If tapping was interrupted,
then there are several possibilities of programming the fast retraction to a certain lift position.
Both the length of the retraction path and the retraction direction can be defined as target
position.
Programming
LFON
Or
LFOF
Where
LIFTFAST= (if enabled as option)
Or
DILF=
Or
ALF=
Parameters
LFON Enable fast retraction for thread cutting (G33)
LFOF Disable fast retraction for thread cutting (G33)
LIFTFAST Fast retraction option acts with LFON in every retraction
direction
DILF Determine retraction path (length)
ALF Define retraction direction for plane to be executed
(LFTXT)