If you see bizarre arc motion displayed on your CNC controller display, it may be that your controller is expecting arc motions to be in a different format than the gcode file currently has them defined.
Here is an example:
1.First answer this question: Does my CNC controller support arc motions?
2.If so, do I want to output them?
If the answer is YES, then it's best to output them for accuracy and surface finish (in most cases).
The problem is that they, the arc motions (G02 and G03) may not be formatted correctly for your CNC controller.
If you are seeing strange output with arcs, then you can make adjustments and fix it in your RhinoCAM post-processor.
1.To edit your post-processor select Post from the Program tab to display the Set Post-Processor Options dialog.
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2.Then pick the Edit button.
3.This will display the Post-processor Generator/editor.
4.Go to the Circle tab and change the arc output format to another option:
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5.Then pick Save As and save it under another file name in the same folder as the current one.
6.Close and open the Set Post-Processor Options dialog and select the revised post from the list and test output.
7.You my have to do Steps 4-6 above, several times to match the arc format your cnc machine is expecting to see
If the answer is No, I want to post lines instead of arcs then it is best to exclude all arc motions from all of your toolpaths.
You can do this from the CAM Preferences dialog and from the Machining tab, check these boxes. Then post and test your output. Now you should not see any dark blue motions and your posted code should not contain any G02 or G03 arc motion codes.
