In February I fixed this bug: https://github.com/LinuxCNC/linuxcnc/issues/1528
But, it seems, I failed to properly consider full-circle spiral arcs, and the test was wrong. https://github.com/LinuxCNC/linuxcnc/issues/2169 (Note that this issue report was _not_ raised by the original reporter, and furthermore seems to show a _different_ issue. I investigated and found a test case that I could reproduce, and put in a fix for that. (linked in the issue report above) However it is reported that the original bug (that I have never reproduced) still exists. Here is the problem description: "if open axis. Comand g2 x0 y0 j5 z-2 f1000. The machine not execution g2 , but only Z-2." I think that the system needs to be set up for immediate homing to 0,0,0 as I have an unconfirmed report that this specific problem does not occur if the axes have moved. (But then the test cases that Tom_L shows in the bug report has the third arc going wrong too) The problem that I have is that my system appears to be working perfectly, so I can't investigate the issue here. I could revert the original patch, but then that reintroduces a known bug, so I don't want to do that. So, first help needed, someone who can compile from source _and_ can reproduce the reported problems. (think that there might be two, and one might well be an uninitialised "start" for the arc in the just-homed case) This clearly can't go out as-is, I am only glad that I didn't put the original fix in 2.8 (I thought that I had, actually) -- atp "A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils and lunatics." — George Fitch, Atlanta Constitution Newspaper, 1912 _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers