On Sun, 7 Jun 2020 at 17:58, Stuart Stevenson <stus...@gmail.com> wrote
> > If you are tilting the head of a knee mill (ie BridgePort style) you would > be rotating the A or B axis. > Yes, I mean B axis. I have been thinking B-axis all along, but for some reason typed C. > You would then be able to jog the theoretical A and/or B axes to match the > head orientation and machine features orthogonal to the tool axis using U > and V. > Which would be useful if LinuxCNC could do UV arcs, but I don't think it does. "The axis of the circle or helix must be parallel to the X, Y, or Z axis of the machine coordinate system. The axis (or, equivalently, the plane perpendicular to the axis) is selected with G17 (Z-axis, XY-plane), G18 (Y-axis, XZ-plane), or G19 (X-axis, YZ-plane). Planes 17.1, 18.1, and 19.1 are not currently supported. If the arc is circular, it lies in a plane parallel to the selected plane." I believe you would need to use tool lengths and a pivot point to have the > display show tool positions relative to other features machined while the A > and B axes were orthogonal to the XY plane. > I was planning to set up the tool lengths to be relative to the centre of rotation of the head. But I suspect that to make that work I would have to move all my tool-lengths in to the W column, as ordinarily the Z length is simply added to the Z axis position with no consideration of kinematics. -- 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-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
