I've been trying to figure this out too, so I tried the following:
I used the wizzard in MACH2 to work this out - - maybe this will help - I hope so. There is a difference in left/right compensation tooMight check that as a possible problem. The file is supposed to cut a circle with diameter of 10 inches, with a 0.25 tool with compensation. Haven't tried it other that a few sims in MACH2.
G0 G49 G40 G17 G80 G50 G90
M6 T0(TOOL DIA. 0.25)
G20 (Inch)
M04 S0
G64 (Constant Velocity Mode)
G00 G43 H0 Z0.1 (G43 apply tool offset LENGTH)
X4.7125 Y0.14375 (a location that includes the offset ~ I guess)
G01 G42 P0.125 X4.85625 F15 (G42 gioves the radius compensation for the 0.25 tool)
G01 Z-0.9000 F30
G02 X5 Y0 R0.14375 F15
G02 X-5 Y0 R5
X5 Y0 R5
G02 X4.85625 Y-0.14375 R0.14375
G40 (turns off compensation)
G00 Z0.1
M5 M9
M30
(end of file )
Cheers - Jim
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