Stop With Thread Cutting (Lfof, Lfon, Lftxt, Lfwp, Lfpos); Retraction For Thread Cutting (Lfof, Lfon, Liftfast, Dilf, Alf) - Siemens SINUMERIK 840Di sl Programming Manual

Example 2
In this example, an M5 thread is to be drilled. The lead of an M5 thread is 0.8 (specified in
table).
With a selected speed of 200 rpm, the feed F is 160 mm/min.
N10 G1 X0 Y0 Z2 S200 F1000 M3
N20 G63 Z-50 F160
N30 G63 Z3 M4
N40 M30
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 (G331/G332). With mixed use of both 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=
Fundamentals
Programming Manual, 11/2006, 6FC5398-1BP10-2BA0
4.19 Stop with thread cutting (LFOF, LFON, LFTXT, LFWP, LFPOS)
;Approach starting point, activate spindle
;Tap, drilling depth 50
;Retract, programmed reversal of direction
;End of program
Motion commands
181