Siemens SINUMERIK 840DE Programming Manual page 336

Tool offsets
8.10 Compensation at the outside corners (G450, G451)
Corner behavior, transition circle, G41, G42, G450
The tool center point travels around the workpiece corner across an arc with tool radius.
At intermediate point P*, the control executes instructions such as infeed movements or
switching functions. These instructions are programmed in blocks inserted between the two
blocks forming the corner.
The transition circle belongs to the next travel command with respect to the data.
Corner behavior, selectable transitions G41, G42, G450 DISC=...
DISC distorts the transition circle, thus creating sharp contour corners.
The values have the following meanings:
DISC=0 transition circle
DISC=100 intersection of the equidistant paths (theoretical value)
8-40
G450
P*
Programming Manual, 10.2004 Edition, 6FC5 298-7AB00-0BP1
Fundamentals