Siemens SINUMERIK 828D Programming Manual page 280

Motion commands
9.14 Fast retraction for thread cutting (LFON, LFOF, DILF, ALF, LFTXT, LFWP, LFPOS, POLF, POLFMASK,
POLFMLIN)
Examples
Example 1: Enable fast retraction for thread cutting
Program code
N55 M3 S500 G90 G18
...
N65 MSG ("thread cutting")
MM_THREAD:
N67 $AC_LIFTFAST=0
N68 G0 Z5
N68 X10
N70 G33 Z30 K5 LFON DILF=10 LFWP ALF=7
N71 G33 Z55 X15
N72 G1
N69 IF $AC_LIFTFAST GOTOB MM_THREAD
N90 MSG ("")
...
N70 M30
Example 2: Deactivate fast retraction before tapping
Program code
N55 M3 S500 G90 G0 X0 Z0
...
N87 MSG ("tapping")
N88 LFOF
N89 CYCLE...
N90 MSG ("")
...
N99 M30
280
Comment
; Active machining plane
; Approach of the starting position
; Feed of the tool
; Reset before starting the thread.
; Enable fast retraction for thread
cutting.
Retraction path = 10 mm
Retraction plane: Z/X (because of
G18)
Retraction direction: -X
(with ALF=3: Retraction direction +X)
; Deselect thread cutting.
; If thread cutting has been
interrupted.
Comment
; Deactivate fast retraction before tapping.
; Tapping cycle with G33.
Programming Manual, 07/2010, 6FC5398-1BP40-0BA0
Fundamentals