On Tue, 20 Dec 2022 at 21:27, Nicklas SB Karlsson <n...@nksb.eu> wrote:
> Three points with three in the (x,y,z) space will define an arc in > three dimensions. Then there is three degrees of freedom for the tool > direction at each point or two for a rotating/"round" tool if I think > correct. We have been discussing this on the forum (At least, I think it was there) and someone had the idea of defining both an end point and a point part-way along the arc. This gives an unambiguous arc in three dimensions. If you define the centre point (in three dimensions) then with a start and an end you get two options. And you can't easily define a clockwise and anticlockwise for an arbitrary plane... But this isn't what I was rambling about, I was discussing making arcs in XY and UV _simultaneously_ where the arcs have different radii and centre points. The issue is not one of maths, but of G-code letters to use for the parameters. An option might be a G2.1 and G3.1 to "queue up" an arc, to be run concurrently with the next feed move. I don't know if this is a solved problem, or whether the foam cutting chaps all just use small linear segments. -- 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
