Siemens SINUMERIK 840D sl Operating Manual page 361

Machining type
You can select the machining mode for milling the circumferential groove as follows:
● Roughing
● Finishing
● Edge finishing
● Chamfering
Milling
Operating Manual, 03/2013, 6FC5398-7CP40-3BA1
During roughing, the individual planes of the groove are machined one after the other
from the center point of the semicircle at the end of the groove until depth Z1 is reached.
In "Finishing" mode, the edge is always machined first until depth Z1 is reached. The
groove edge is approached on the quadrant that joins the radius. In the last infeed, the
base is finished from the center point of the semicircle to the end of the groove.
Edge finishing is performed in the same way as finishing, except that the last infeed
(finish base) is omitted.
Chamfering involves edge breaking at the upper edge of the circumferential groove.
SC
Figure 8-4 Geometries when chamfering inside contours
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.
Programming technological functions (cycles)
SC
ZFS
8.2 Milling
361