For arc moves in XYUV, you can enable it by selecting the Multi Quad. (Avail. in XYUV) option in the Circ. Interpolation field in the General Information dialog of XBUILD.
Note: You must be in an EDM post.
Arc moves will be output when both the upper and the lower moves are arcs. The XYUV format should look similar to:
<IF><XYUV-ARC><THEN>
N<SEQ>{ <MOTION>}{ X<X-COORD>}
{ Y<Y-COORD> }I<ARC-X> J<ARC-Y> U<U-RELAT>
V<V-RELAT> K<U-CEN-RELAT> L<V-CEN-RELAT><EOB>
<ELSE>
N<SEQ>{ <MOTION>}{ X<X-COORD>}
{ Y<Y-COORD> } U<U-RELAT> V<V-RELAT>
<EOB>
<ENDIF>
The <XYUV-ARC> reserved word will be true when outputting arc moves. The <ARC-X> and <ARC-Y> reserved words will be the vector from the start point of the lower arc to the center. <U-CEN-RELAT> and <V-CEN-RELAT> will be the vector from the center of the lower arc to the center of the upper arc.