Siemens SINUMERIK 828D Commissioning Manual page 482

Configuring cycles
7.5 Turning
Between traveling to the fixed stop and gripping, the counterspindle can retract a short distance
to counteract compressive stress in the workpiece.
SD55553 $SCS_TURN_FIXED_STOP_RETRACTION
After gripping you can cut off the workpiece. Before doing so, the counterspindle can retract
a short distance with the workpiece to exert tensile stress on the workpiece. This relieves
pressure on the tool when cutting off.
SD55543 $SCS_TURN_PART_OFF_RETRACTION
After parting, you can carry out a cut-off check and for turning, use the "Travel to fixed stop"
function. You can activate/deactivate the cut-off check using the channel-specific cycle setting
data:
SD55540 $SCS_TURN_PART_OFF_CTRL_DIST
SD55541 $SCS_TURN_PART_OFF_CTRL_FEED
SD55542 $SCS_TURN_PART_OFF_CTRL_FORCE
The cut-off is successful when travel to fixed stop fails. The following alarms are output:
Alarm
20091
20094
You can switch off the alarm display using the following machine data:
MD37050 $MA_FIXED_STOP_ALARM_MASK
= 2
You can set this machine data axis-specifically in the "Machine Data" window in the "Tool zero"
operating area.
If, however, the specified force is reached during the cut-off check (i.e. travel to fixed stop is
successful), alarm 61255 "Error during cut-off: Tool break?" is issued.
Note
The "Travel to fixed stop" function can also be used when gripping the spindle (see above). If
travel to fixed stop does not succeed when gripping, an alarm will of course also be issued.
Instead of alarms 20091 and 20094, the alarm 61254 "Error during travel to fixed stop" will be
issued.
Machine manufacturer cycle
If you perform one of the following actions, you must adapt the machine manufacturer cycle
CUST_TECHCYC.SPF.
● Switch between spindle and C axis mode for the main spindle or counterspindle.
● Open, close, flush chuck (main spindle / counterspindle).
● Change default settings for the coupling of the main spindle and counterspindle.
114
Alarm text
Axis %1 has not reached the fixed stop.
Axis %1 end stop has been aborted.
Suppressing alarms 20091 and 20094.
Retraction distance before clamping af‐
ter fixed stop.
Retraction distance before cut-off.
Distance for cut-off check.
Feedrate for cut-off check.
Force for cut-off check in %.
Enabling the fixed stop alarms.
Commissioning Manual, 10/2015, 6FC5397-3DP40-5BA3
SINUMERIK Operate