Yaskawa YASNAC PC NC Programming Manual - Manual (Page 37)

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YASNAC PCNC Programming Manual Chapter 2: Commands Calling Axis Movements
If the specified end point is not on the specified arc, the arc radius is gradually changed
from the start point to the end point to generate a spiral so that the end point lies on the
specified arc.
FIGURE 2.1.3.3 Interpolation with End Point off the Specified Arc
(d) Center of arc
The center of arc can be specified in two methods – designation of the distance from the
start point to the center of the arc and designation of the radius of the arc.
• Specifying the distance from the start point to the center
Independent of the designated dimensioning mode (G90 or G91), the center of an arc
must be specified in incremental values referenced from the start point.
• Specifying the radius
When defining an arc, it is possible to specify the radius by using address R instead of
specifying the center of the arc by addresses I, J, or K. This is called “circular interpo-
lation with R designation” mode.
•
For the circular arc with the central angle of 180 deg. or smaller, use an R