Stop For Thread Cutting - Siemens SINUMERIK 828D Function Manual

17.2.4.4

Stop for thread cutting

Stop for thread cutting
Note
The non­destructive interrupt function should only be used for thread cutting, not for tapping
with G33.
Retraction movement
The retraction motion (liftfast) for thread cutting is controlled by the following keywords:
• LFON
⇒ Enable liftfast for thread cutting.
• LFOF
⇒ Disable liftfast for thread cutting.
These G functions can always be programmed.
The default setting for NC Reset and/or NC Start is specified in machine data:
MD20150 GCODE_RESET_VALUES.
The following sources can initiate a retraction motion during thread cutting:
• Fast inputs (programming with SETINTLIFTFAST for "LIFTFAST" option)
• NC Stop
• Alarms that implicitly initiate the NC stop.
Figure 17-3 Interruption of G33 through retraction motion
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
V1: Feedrates
17.2 Path feedrate F
1381