STOPRE
R10=$P_TOOLNO
$P_DP1[R10,1]=120
$P_DP3[R10,1]=100
$P_DP6[R10,1]=R101
R101=157.5
R100=355 R99=R100/2 ;Diameter and Radius
R98=R99-R101 R97=R98/2
R168=-10 ;Depth
R169=-15
R170=30 ;Degree
R171=TAN(R170)*ABS(R168)
G54 G19 D1
G0 G90 X50
G0 G90 Y Z
AA:
G0 G90 X=R168
G3 G91 G64 Y=-R98 Z0 J=-R97 K0
G3 J=R98
G1 G91 Y=R98
IF R168<=R169 GOTOF BB
R168=R168-5
****R99=R99-R171
GOTOB AA
BB:
G0 G90 X50
M30
在程序中R98的值无法改变，可是将R99=R99-R171改成R98=R98-R171后机床报警循环终点错误！！
请各位高手指教哪里出的问题？