Siemens SINUMERIK 840D sl Operating Manual page 338

Programming technological functions (cycles)
8.2 Milling
Machining type
● Roughing
● Finishing
● Edge finishing
● Chamfering
338
During roughing, the individual planes of the rectangular pocket are machined one after
the other from the center point until depth Z1 is reached.
During finishing, the edge is always machined first. The rectangular pocket edge is
approached on the quadrant that joins the corner radius. In the last infeed, the base is
finished from the center out.
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 rectangular pocket.
SC
Figure 8-1 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.
SC
ZFS
Operating Manual, 03/2013, 6FC5398-7CP40-3BA1
Milling