I've looked at other posts that have a similar error but none seem close enough. All I'm trying to do is face a spoilboard on my new Avid CNC router. The gcode is created by Fusion 360, very simple like mowing the lawn. It does the same thing over and over but mine stops about halfway through with the error. The only thing that changes from pass to pass is the "Y" value. I think it stops at the Y7.5179 command. Not sure why it says "Line 0".

If I try this with a nice radius at each end I get end stop errors. I'm supposed to have 49" in the "Y" direction but I'm only asking it to do 48". I'm using an Amana RC-2256 2" flycutter which is designed to do just this type of work. The parts that get surfaced look perfect. 

Please help, at this point my spoilboard looks like someone that doesn't know what he is doing worked on it. Good chance they are right.   


(FACE 5)
(T99  D=1.9685 CR=0. - ZMIN=-0.01 - FACE MILL)
G90 G94 G91.1 G40 G49 G17
G20

(FACE1)
M5
T99 M6
S14000 M3
G54
G0 X0.0 Y17.7462
G43 Z0.4 H99
Z0.2
G1 Z0.1868 F13.3
G18 G2 X0.0 Z-0.01 I0.1969 K0. F40.
G1 X0.
X48.
Y17.0156
X0.
Y16.285
X48.
Y15.5544
X0.
Y14.8238
X48.
Y14.0932
X0.
Y13.3626
X48.
Y12.632
X0.
Y11.9014
X48.
Y11.1708
X0.
Y10.4402
X48.
Y9.7096
X0.
Y8.9791
X48.
Y8.2485
X0.
Y7.5179
X48.
Y6.7873
X0.
Y6.0567
X48.
Y5.3261
X0.
Y4.5955
X48.
Y3.8649
X0.
Y3.1343
X48.
Y2.4037
X0.
Y1.6731
X48.
Y0.9425
X0.
G3 X0.0 Z0.1868 I0. K0.1968
G0 Z0.4
G17

M30
 

I think there is something wrong with the post processor you are using. A lot of your X values have no values after the decimal place and the G2 and G3 commands have 0. values for K and I

Like I said the post processor is Fusion 360. I'll try adding the .0 to all the 0. Strange it works for about half the job. Thanks for the input.

I don't know why it stops halfway thru and not earlier, but what is that G18 line doing? Arcing down in the Z, looks like. Switching the plane to XZ and never switching back to XY? First thing I'd do is put a G17 in the line after the G18 line. Still doesn't explain why it gets as far as it does without burping as there are no G02/G03 moves in XY which would require the plane to be switched back! I'm mystified.

Sorry I haven't replied sooner. I have not been able to test anything yet. Besides stopping in the middle of the job I found that even taking .010" off of my spoil board with minimum dust collection created a huge dust cloud in the shop. It may take me years if ever to clean it all up. I'm now converting an old single stage dust collector into a two stage. It's been about 100° here for over a week so the work is going slow. I get back soon I hope. Thanks again for the help.

By the way, can I just take the G18 as I don't see how it does anything but confuse the issue?

By the way, can I just take the G18 as I don't see how it does anything but confuse the issue?

The G18 is likely necessary for the arc down move in your program. I'm guessing your CAM software is using that to avoid a straight down Z move into the work. Lots of times CAM uses ramp down or helix down. Maybe you could check your CAM software and use a different method to move the Z down. Or put a G17 in the line after the G18 line just to see if that's it!!! If you could fix it in your CAM you'd avoid hand editing Gcode, something modern folks seem hate with a passion!!!

best way to define G2 G3 its by radius not by distance,because by distance can be even very litle difernt calulation betwen yours pp
and  mach  and will give you an eroor
try change the format on yours pp

I think this may all be a moot point. I changed the design put out my Avid CNC for a kind of "something to get started with" thing. I went back to their full 4'(x) x 8'(y) unmodified file and found that their facing ran in the long for them Y direction where mine ran in my long X direction. To get started I'm only using the first 16". I changed the tool direction and I think that should fix (far from all) my problem. Thanks for the help. Hopefully someday I can return the favor.