Siemens SINUMERIK 828D Programming Manual page 328

Tool radius compensation
10.5 Collision monitoring (CDON, CDOF, CDOF2)
Example 3: Tool radius too large for internal machining
In such cases, the contours are machined only as much as is possible without causing a
contour violation.
References
Function Manual, Basic Functions; Tool Offset (W1), Chapter: "Collision detection and
bottleneck detection"
328
Programming Manual, 07/2010, 6FC5398-1BP40-0BA0
Fundamentals