So I’ve run into my first issue with my MPCNC (dual end stops, Rambo, Marlin, all stock from V1).
I’ve run the crown test, with a pen and a bit - no issues. I did a full 3D carving (~8hrs milling, attached) with no issues either… until I went to cut the frame. Specifically, on the corners of the frame the steppers went crazy, trying to pull the bit in opposite directions - or at least that’s what it looked like because both X and Y axis were off after the bit passed the corner. Luckily the arc was small and I was able to shut it off quickly. As such, I ended up cutting the frame out separately, as seen in the photo attached.
I inspected gcodes I had successfully run, including the Test Crown 12mm/s and the 3D carving base file and both only had G0 and G1 movements, i.e., all linear and no arcs. However, the frame file had G2 movements at the corners (e.g., G2 X187.065 Y-2.455 Z-1.500 I-1.585 J0.000 K0.000 F480.000).
The issue seems to be with the G2 command. I can only assume and speculate this may be related to how Marlin translates the G2 movement to the steppers that leads them to behave erratically.
Has anyone else experienced this or can anyone confirm successful G2 command on a dual end stop MPCNC?