Siemens SINUMERIK 840D sl Turning Operating Manual page 545

Machining type, finishing:
When finishing walls, the milling cutter travels along the slot walls, whereby just like for
roughing, it is again fed in the Z direction, increment by increment. During this process, the
milling cutter travels through the safety clearance beyond the beginning and end of the slot, so
that an even slot wall surface can be guaranteed across the entire length of the slot.
Machining type, edge finishing
Edge finishing is performed in the same way as finishing, except that the last infeed (finish
base) is omitted.
Machining type, finishing base:
When finishing the base, the milling cutter moves backwards and forwards once in the finished
slot.
Machining type, chamfering
Chamfering involves breaking the edge at the upper slot edge.
Figure 10-17
Note
The following error messages can occur when chamfering inside contours:
● Safety clearance in the program header too large
This error message appears when chamfering would, in principle, be possible with the
parameters entered for FS and ZFS, but the safety clearance then could not be maintained.
● Immersion depth too large
This error message appears when chamfering would be possible through the reduction of
the immersion depth ZFS.
● Tool diameter too large
This error message appears when the tool would already damage the edges during
insertion. In this case, the chamfer FS must be reduced.
Turning
Operating Manual, 06/2019, A5E44903486B AB
Geometries when chamfering inside contours
Programming technology functions (cycles)
10.4 Milling
545