Siemens SINUMERIK 840D sl Programming Manual page 258

Fundamentals
2.10 Tool radius compensation
NORM and KONT can be used to define the tool path on activation and deactivation of
compensation mode (see "Approaching and leaving contour (NORM, KONT, KONTC, KONTT)
(Page 260)").
Point of intersection
The intersection point is selected in the setting data:
SD42496 $SC_CUTCOM_CLSD_CONT (behavior of tool radius compensation with closed
contour)
Value
FALSE
TRUE
Change in compensation direction (G41 ↔ G42)
A change in compensation direction (G41 ↔ G42) can be programmed without an intermediate
G40.
258
Meaning
If two intersections appear on the inside when offsetting an (almost) closed contour,
which consists of two successive circle blocks or one circle block and one linear block,
the intersection positioned closer to the end of block on the first partial contour is se‐
lected in accordance with the standard procedure.
A contour is deemed to be (almost) closed if the distance between the starting point of
the first block and the end point of the second block is less than 10% of the effective
compensation radius, but not more than 1000 path increments (corresponds to 1 mm
with 3 decimal places).
In the same situation as described above, the intersection positioned on the first partial
contour closer to the block start is selected.
Programming Manual, 12/2019, 6FC5398-2EP40-0BA0
NC programming