G03 does not stop at end point

[labuda]

Hi,
I've been running Mach3 Mill using g-code generated with Catia V5 via a fanuc_16_mill3 post.
Everything has been running well, until i tried to using circular interpolation along the XZ plane (G18). The chosen arc are the wrong ones. They do the other part of the circle. I tried everything, including changing G03 into G02 and vice versa. The direction would then change, but it would give me full circles instead of short arcs.

I solved the problem by rotating my assembly such that the interpolation occurs on the YZ plane.
Why did this solve it? Aren't the x and y axes symmetric with z?
Any clue what i should do to fix it in the XZ plane?

Any tips appreciated!
Thanks

aleks.




Here is the part of the code:

FOR XZ Plane: (this doesn't work!)
( OPERATION NAME : Tool Change.2)
( T145 1/2" Ball End Mill)
( Tool 45 machining time is 1503.3 seconds)
N156 M9
N158 M5
N160 T45 M6
N162 M8
N164 S6015 M3
( OPERATION NAME : Curve Following.2)
N166 G01 G43 X26.327 Y2.275 Z-1.545 F100. H45
N168 Z-4.742
N170 G18 G02 X15.833 Z-1.377 I-10.488 K-14.663 F200.
N172 G02 X-23.216 Z-2.87 I-15.872 K-96.281
N174 G02 X-26.327 Z-4.942 I1.358 K-5.41
N176 G03 X-15.833 Z-1.577 I10.488 K-14.663
N178 G03 X23.216 Z-3.07 I15.871 K-96.292
N180 G03 X26.327 Z-4.942 I-3.68 K-9.637
N182 G01 Z-1.545 F1000.




FOR YZ Plane: (this works)
( OPERATION NAME : Tool Change.2)
( T145 1/2" Ball End Mill)
( Tool 45 machining time is 1503.3 seconds)
N156 M9
N158 M5
N160 T45 M6
N162 M8
N164 S6015 M3
( OPERATION NAME : Curve Following.2)
N166 G01 G43 X-2.275 Y26.327 Z-1.545 F100. H45
N168 Z-4.742
N170 G19 G03 Y15.833 Z-1.377 J-10.488 K-14.663 F200.
N172 G03 Y-23.216 Z-2.87 J-15.872 K-96.281
N174 G03 Y-26.327 Z-4.942 J1.358 K-5.41
N176 G02 Y-15.833 Z-1.577 J10.488 K-14.663
N178 G02 Y23.216 Z-3.07 J15.871 K-96.292
N180 G02 Y26.327 Z-4.942 J-3.68 K-9.637
N182 G01 Z-1.545 F1000.