请高手指点,哥们是新手还不太懂！

用的是平面轮廓，模拟出来刀路是好的，后处理第一层是圆的，第二层没有圆了，求姐？后处理如图QQ截图20130108142752.png
G0 G90 G53 X-38.513 Y-109. S0 M03
G43 Z20. H00
Z-2.
G1 Z-5. F250. M08
Y-100.
Y-70.852
G3 X-61.487 I-11.487 J0.0
G1 Y-100.
Y-109.
Z-2.
G0 Z20.
X-38.513
Z-7.
G1 Z-10.
Y-100.
Y-70.852
G3 X-61.487
G1 Y-100.
Y-109.
Z-7.
G0 Z20.
X-38.513
Z-12.
G1 Z-15.
Y-100.
Y-70.852
G3 X-61.487
G1 Y-100.
Y-109.
Z-12.
G0 Z20.
X-38.513
Z-17.
G1 Z-20