Siemens SINUMERIK 840D sl Function Manual page 1864

Detailed Description
2.4 Tool radius compensation 2D (TRC)
Figure 2-29
G451 (intersection)
If G function G451 is active, the position (intersection) resulting from the path lines (straight
line, circle or helix only) located at a distance of the tool radius to the programmed contour
(center-point path of the tool), is approached. Spines and polynomials are never extended.
76
Overshoot with DISC depending on contour angle
Basic logic functions: Tool Offset (W1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0