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Spiral roughing hiccup?
Not sure this is an issue.
I have run some motion tests with a new cnc router build running g2 on a DUE. Gcode is from RhinoCam. I am running firmware version 100.26.
In one of my tests I am using spiral roughing. At the "same spot" on each pass of the spiral the machine seems to jump back a mm or two causing a noticeable jolt in otherwise smooth motion. I do not see any similar behavior when executing this as a parallel roughing operation. I still need to try this as a circular offset rather than spiral.
I see no indication that this is mechanical. Any thoughts if this could be a g2 vs RhinoCam issue? I am suspecting some small, hard to see issue with arc interpolation. Not sure how to troubleshoot this behavior and could use some suggestions.
Can you attach the gcode?
On Sat, Mar 27, 2021 at 9:39 PM Mgilbride @.***> wrote:
Not sure this is an issue.
I have run some motion tests with a new cnc router build running g2 on a DUE. Gcode is from RhinoCam. I am running firmware version 100.26.
In one of my tests I am using spiral roughing. At the "same spot" on each pass of the spiral the machine seems to jump back a mm or two causing a noticeable jolt in otherwise smooth motion. I do not see any similar behavior when executing this as a parallel roughing operation. I still need to try this as a circular offset rather than spiral.
I see no indication that this is mechanical. Any thoughts if this could be a g2 vs RhinoCam issue? I am suspecting some small, hard to see issue with arc interpolation. Not sure how to troubleshoot this behavior and could use some suggestions.
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I need to do more testing. I noticed this page of the post processor. It was set to helical interpolation. There's an option for spiral interpolation.
OK. After another couple of hours testing... I updated the helix/spiral arc interpolation settings in the postprocessor. I utilized arc fitting in the machining settings. All pictured in screenshots here. Updated Gcode also attached here. I get less regularity and severity in the pauses / jumps. I caught an example on a short video. They happen the same place on each layer. But they now don't occur every pass. So, I think this is down to arc interpolation. And it could just be that I am not knowledgeable enough about the settings here. And / or there is a limitation in G2 firmware or RhinoCam.
https://user-images.githubusercontent.com/741811/112767131-f2927f00-8fe2-11eb-8606-676ac2718e38.MOV
TestGeometry8.txt