Siemens SINUMERIK 840D sl Operating Manual page 398

Programming technology functions (cycles)
10.3 Contour turning
Rounding the contour
In order to avoid residual corners during roughing, you can enable the "Always round the
contour" function. This will remove the protrusions that are always left at the end with each cut
(due to the cut geometry). The "Round to the previous intersection" setting accelerates
machining of the contour. However, any resulting residual corners will not be recognized or
machined. Thus, it is imperative that you check the behavior before machining using the
simulation.
When set to "automatic", rounding is always performed if the angle between the cutting edge
and the contour exceeds a certain value. The angle is set in a machine data element.
Alternating cutting depth
Instead of working with constant cutting depth D, you can use an alternating cutting depth to
vary the load on the tool edge. As a consequence you can increase the tool life.
Figure 10-6
The percentage for the alternating cutting depth is saved in a machine data element.
Cut segmentation
To avoid the occurrence of very thin cuts in cut segmentation due to contour edges, you can
align the cut segmentation to the contour edges. During machining the contour is then divided
by the edges into individual sections and cut segmentation is performed separately for each
section.
Set machining area limits
If, for example, you want to machine a certain area of the contour with a different tool, you can
set machining area limits so that machining only takes place in the area of the contour you
have selected. You can define between 1 and 4 limit lines.
The limit lines must not intersect the contour on the side facing the machining.
398
Machine manufacturer
Please observe the information provided by the machine manufacturer.
Alternating cutting depth
Machine manufacturer
Please observe the information provided by the machine manufacturer.
Operating Manual, 05/2017, A5E40868721
Turning