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Author Topic: G02 / G03 Problem  (Read 3296 times)

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G02 / G03 Problem
« on: July 17, 2013, 04:04:05 PM »
Hello,

we have a problem with G02/G03 Commands with our plasma cutter.
Most times it works ok, but sometimes the Command will not move a circle.
I cannot find a reason for this. It seems to be only dependand on the X/Y location.

Here is an example that does not work (always reproducable):

N0030 G21 (Units: Metric)
N0040 G53 G90 G91.1 G40
N0090 M06 T2 F2000.0  (2000mm/min)
N0100 G00 Z20.0000
N0110 X89.4288 Y86.4878
N0120 Z0.0000
N0130 G28.1 Z0 (Z-Achse auf Home fahren)
N0140 G00 Z0 (Z-Achse von Offset auf 0)
N0150 M03
N0160 G03 X89.4288 Y86.4878 I0.0000 J9.7500 F2000.0
N1000 M05 M30

And this works (only modification is X/Y coordinates)

N0030 G21 (Units: Metric)
N0040 G53 G90 G91.1 G40
N0090 M06 T2 F2000.0  (2000mm/min)
N0100 G00 Z20.0000
N0110 X89.4200 Y86.4800
N0120 Z0.0000
N0130 G28.1 Z0 (Z-Achse auf Home fahren)
N0140 G00 Z0 (Z-Achse von Offset auf 0)
N0150 M03
N0160 G03 X89.4200 Y86.4800 I0.0000 J9.7500 F2000.0
N1000 M05 M30


With the error-code only a hole is pierced where the circle should start, nothing else.
We are using current Version of Mach3 R3.043.066.

Any ideas how this can be fixed?

Greetings,
Ralf Kuhlendahl

Offline Graham Waterworth

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Re: G02 / G03 Problem
« Reply #1 on: July 17, 2013, 04:45:14 PM »
Try it like this :-

N0030 G21 (Units: Metric)
N0040 G53 G90 G91.1 G40
N0090 M06 T2 F2000.0  (2000mm/min)
N0100 G00 Z20.0000
N0110 X89.4288 Y86.4878
N0120 Z0.0000
N0130 G28.1 Z0 (Z-Achse auf Home fahren)
N0140 G00 Z0 (Z-Achse von Offset auf 0)
N0150 M03
N0160 G03 J9.7500
N1000 M05 M30
« Last Edit: July 17, 2013, 04:47:31 PM by Graham Waterworth »
Without engineers the world stops
Re: G02 / G03 Problem
« Reply #2 on: July 18, 2013, 03:05:01 PM »
That g-code is produced by Sheetcam.
I modified the postprocessor to do the touch probe before the cut starts but i am not very familiar with g-code.
Thanks for your response, i will try to figure it out.
Re: G02 / G03 Problem
« Reply #3 on: July 18, 2013, 04:28:07 PM »
It works.
I only needed to remove 2 lines of code in the Sheetcam Postprocessor OnArc function.

Many Thanks!