Yaskawa YASNAC PC NC Programming Manual - Manual (Page 108)

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YASNAC PCNC Programming Manual Chapter 3: Movement Control Commands
Direction of offset is switched at the point of intersection of the offset tool paths.
FIGURE 3.4.4.32 Switching of the Offset Direction at Point of Intersection of Offset
If there is no point of intersection, the offset direction is switched according to type A.
FIGURE 3.4.4.33 Switching of the Offset Direction when There Intersection is No Point
of Intersection