3D cutter comp is a totally different animal. Tool Point Control is a better term for what I am proposing.
Stuart On Thu, Apr 15, 2021 at 7:18 AM Feral Engineer <theferalengin...@gmail.com> wrote: > As a follow to Andy's comment, I've been on 5 axis mills for 17 years and > honestly have never once used 3d cutter comp. It has a place, but it's a > very small place. Only one customer has ever asked about it. > > Phil T. > The Feral Engineer > > Check out my LinuxCNC tutorials, machine builds and other antics at > www.youtube.com/c/theferalengineer > > On Thu, Apr 15, 2021, 7:03 AM andy pugh <bodge...@gmail.com> wrote: > > > On Thu, 15 Apr 2021 at 05:49, Stuart Stevenson <stus...@gmail.com> > wrote: > > > > > My current attention to the project is driven by my desire to have 5 > > axis > > > cutter diameter compensation in LinuxCNC. > > > > I think that there is an argument that this is better done in the CAM > > as it has a much better idea where the material is, and can handle > > non-cylindrical cutters. > > Not that I am against the idea of it being doable in the controller, I > > just think that it won't see much use. > > > > > Circular interpolation is also an area to be simplified. G17, G18 and > > G19 > > > can be eliminated. They would have to stay so legacy programs would > still > > > function. I would implement G02/G03 as follows: > > > G02/G03 X Y Z I J K F would circle the tool around a vector > perpendicular > > > to a plane described by the IJ values combined with the XY start point > > > > It might be simpler to just define the centre point with IJK and > > eliminate the explicit plane entirely. I think that start, centre and > > end defines a circular arc in 3D space completely?) > > > > The interpreter could learn to use the new-style arc whenever it sees > > all three of IJK. Or, alternatively, we could use the currently unused > > G16 code to mean "arbitrary planes" > > (G16 means "Polar coordinates" in Fanuc, but LinuxCNC uses @ and ^ for > > that. If clashing with Fanuc is a problem then G19.9 could be used.) > > I think that I prefer an INI entry in [TRAJ] that turns accepting all > > of IJK in an M2 / M3 on and off. > > > > Note that there is already an old branch that attempted arbittrary arcs > > https://github.com/LinuxCNC/linuxcnc/tree/arbitrary-arc > > You can see the chages here: > > > > > https://github.com/LinuxCNC/linuxcnc/commit/0fc41d50c1bce2bdecc8a90e6e5057af5153d66f > > This used a "magic comment" to define the curve, but it can be seen > > that it is pretty much the same input data as suggested above. > > > > -- > > 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 > > > > _______________________________________________ > Emc-developers mailing list > Emc-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-developers > -- Addressee is the intended audience. If you are not the addressee then my consent is not given for you to read this email furthermore it is my wish you would close this without saving or reading, and cease and desist from saving or opening my private correspondence. Thank you for honoring my wish. _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
