Siemens SINUMERIK 840D sl Programming Manual page 495

Further information
Behavior at outer corners
A circle block with the radius of the cutter is always inserted at an outside corner.
The ORIC and ORID program commands are used to determine whether changes in
orientation programmed between block N1 and N2 are executed before the inserted circle
block is processed or at the same time.
If an orientation change is required at outside corners, this can be performed either at the
same time as interpolation or separately together with the path movement.
When ORID is programmed, the inserted blocks are executed first without path motion. The
circle block generating the corner is inserted immediately before the second of the two
traversing blocks.
If several orientation blocks are inserted at an external corner and ORIC is selected, the
circular motion is distributed among the individual inserted blocks according to the absolute
values of the orientation changes.
Job Planning
Programming Manual, 06/2009, 6FC5398-2BP20-0BA0
7.6 Tool orientation (ORIC, ORID, OSOF, OSC, OSS, OSSE, ORIS, OSD, OST)
Tool offsets
495