Siemens SINUMERIK 840D sl Function Manual page 86

W1: Tool offset
2.5 2D tool radius compensation
Figure 2-25
The last block with active tool radius compensation (N20) is so short that an intersection no
longer exists between the offset curve and the preceding block (or a previous block) for the
current tool radius. An intersection between the offset curves of the following and preceding
blocks is therefore sought, i.e. between N10 and N30 in this example. The curve used for the
retraction block is not a real offset curve, but a straight line from the offset point at the end of
block N20 to the programmed end point of N30. The intersection is approached if one is found.
The colored area in the figure is not machined, although the tool used would be capable of this.
G460
With G460, the approach/retraction strategy is the same as before.
G461
If no intersection is possible between the last TRC block and a preceding block, the offset curve
of this block is extended with a circle whose center point lies at the end point of the uncorrected
block and whose radius is equal to the tool radius.
Figure 2-26
86
Retraction behavior with G460
Retraction behavior with G461
Function Manual, 06/2019, A5E47435126B AA
Tools