Siemens SINUMERIK 840D sl Function Manual page 83

Figure 2-23
Calculation of intersection
When the intersections in blocks with variable compensation value are calculated, the
intersection of the offset curves (tool paths) is always calculated based on the assumption that
the compensation value is constant.
If the block with the variable compensation value is the first of the two blocks to be examined
in the direction of travel, then the compensation value at the block end is used for the
calculation; the compensation value at the block start is used otherwise.
Figure 2-24
Restrictions
If during machining on the inside of the circle the compensation radius becomes geater than the
programmed circle radius, then the machining is rejected with the following alarm:
Alarm 10758 "Curvature radius with variable compensation value too small"
Tools
Function Manual, 06/2019, A5E47435126B AA
Tool radius compensation with variable compensation value
Intersection calculation with variable compensation value
W1: Tool offset
2.5 2D tool radius compensation
83